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Volume 61, Issue 4
Displaying 1-25 of 25 articles from this issue
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Yuji MATSUE, Kouji HARADA, Tomohiko YOSHIDA1992 Volume 61 Issue 4 Pages 545-550
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe stability of rice varieties as regards palatability values was studied by analysis of variance and Finlay-Wilkinson's method, using 9 varieties grown in Northern Kyushu. Variance between years for each variety was computed as a measure of stability. A regression coefficient in Finlay-Wilkinson's method was also computed. Judging by the variance and the regression coefficient and the mean values, the varieties tested could be divided into four groups, i.e., varieties with high and stable, with high and instable, low and stable, and low and instable values of palatability. In a similar manner, the stability of locations was also evaluated. The 10 locations examined were divided into high and low stability groups. No clear relationship between soil types and the stability of locations was found.View full abstractDownload PDF (683K) -
Kengo INABA1992 Volume 61 Issue 4 Pages 551-554
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSKonjak plants (cv. Zairai) were grown in pots using 2-year-old seed corms of 75 g in weight, containing different amount of nitrogen. The leaf area, dry weight and amount of nitrogen absorption were measured at 35, 65, 95 and 140 days after planting. The plants grown from the seed corms with high nitrogen (N, 0.44 g/corm) had larger leaf area and dry weight of leaf, root, new corm and total plant at all growing times and absorbed larger amount of nitrogen than those from the seed corms with low nitrogen (N, 0.29 g/corm). Especially, remarkable differences were found in root number, dry weigth of root and in nitrogen content at 35 and 65 days after planting.View full abstractDownload PDF (529K) -
Moriyuki MAKINO1992 Volume 61 Issue 4 Pages 555-560
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSAuricles developing on the leaves of main stem in var. Koshihikari were the longest in the fourth leaf from the flag leaf. The length of auricle continued to become shorer than the one below and finally the auricle disappeared in the flag leaf. The author called the lowest leaf, whose auricle is shorter than the one below, "the first leaf with shortened auricle". A similar phenomenon was observed in the leaf blade, leaf ligule and leaf sheath of rice plants. Since, among these four leaf organs, the first leaf with shortened auricle appeared at the earliest developed leaf position, this was considered an important index for the optimum timing of topdressing at the ear formation stage. Its morphological changes after shooting at each leaf position were investigated. The study revealed : (1) emergence stage of the first leaf with shortened auricle was close to the initial stage of internode elongation : (2) the period from the time when the first leaf with shortened auricle was recognized to the optimum time of topdressing at the panicle formation stage (leaf number index 90∼92) was 0.60-0.90 in leaf age, four to five days in var. Nihonbare. However, this period differs from variety to variety.View full abstractDownload PDF (675K) -
Akio MATSUZAKI, Tetsuo TAKANO, Seiichi SAKAMOTO, Tsutomu KUBOYAMA1992 Volume 61 Issue 4 Pages 561-567
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSTo clarify the relation between the eating quality and inorganic chemical components in rice kernels or amino acid content in cooked rice, the authors collected 18 cultivars from inside and outside Japan. Eleven cultivars out of them were examined in terms of sensory test by "the visitors at the May festival" of the University of Tokyo. Experimental results showed that the evaluation of sensory test coincided with the evaluation by an expert panel of "Japan Cereals Inspection Association". Cultivars that had a high eating quality had a lower amylose and nitrogen content in their kernels. On the other hand, cultivars that had low evaluation showed a higher amylose and/or nitrogen content in kernels. Amounts of amino acid exuded from cooked rice showed a specific patttern in the total amount and the ratio of them to the total one. Namely, cultivars that had a high eating quality in japonica type rice, had a low level of free amino acid and comparatively higher rate of glutamic acid and aspartic acid. In principal component analysis, amylose and nitrogen content showed a large factor loading of primary component, and both primary and secondary factors loading of asparagine, aspartic acid, alanine and sarcosine showed positive values. However glutamic acid and aspartic acid showed positive rate of contribution to eating quality in multiple regression analysis. From these results, it was estimated that glutamic acid and aspartic acid content might be responsible for improving of eating quality of rice kernels as well as amylose and nitrogen content.View full abstractDownload PDF (718K) -
Junko YAMAGISHI, Tsuneo YAJIMA, Kunio ETOH, Haruo SUZUKI, Shinobu INAN ...1992 Volume 61 Issue 4 Pages 568-575
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe relationships between number of spikelets per panicle and the characters of shoot and the size around growing point at panicle initiation stage were studied with the rice varieties bearing much different number of spikelets from 1989 to 1991 in a paddy field, aiming to clarify the mechanism of varietal difference in number of spikelets per panicle. The number of spikelets per primary rachis branch, internode diameter (especially the first internode from top) and panicle length had positive linear relationships to number of spikelets per panicle on main stem in each year. These relationships of number of spikelets per panicle on main stem to number of spikelets per primary rachis branch and the first internode diameter were well applicable to all tillers, irrespective of varieties and years. The diameter of young panicle base in panicle initiation stage, assumed to be the size around growing point, on main stem was positively related to number of spikelets per panicle and the first internode diameter closely. Number of spikelets per panicle is assumed to be the same when diameter of young panicle base is the same in all varieties studied, even though the varieties have less endogenous gibberellins. Therefore, it is concluded that diameter of growing point at panicle initiation stage plays a very important role in determination of the number of differentiated spikelets per panicle through number of spikelets per primary rachis branch, and causes varietal difference in number of spikelets per panicle.View full abstractDownload PDF (796K) -
Tadashi TAKAHASHI, Kimiko NAKASEKO1992 Volume 61 Issue 4 Pages 576-582
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe influences of temperature and photoperiod to phenological development of two spring wheat varieties, early Haruyutaka bred in Hokkaido and late Selpek bred in Germany, were investigated at the field of Agricultural Experimental Farm of Hokkaido University. There were linear relations between the rate of development and temperature through the all of growth phases for both two varieties. In growth phase I and II that is, phases before flag leaf emergence, the rate of development increased as temperature increased, at a larger extent in Haruyutaka than in Selpek. In growth phase IV + V, grain-filling period, the rate of development decreased at low temperature especially in Selpek. The thermal developmental rate, 1/D (T-Ts), is the value of developmental rate, 1/D, divided by temperature, (T-Ts). T and Ts are mean and base temperature, respectively. There were linear relationships between this thermal developmental rate and mean photoperiod in growth phase I and II, indicating photoperiod affected developmental rate more sensitively in Haruyutaka than in Selpek. On the other hand, we compared the calculated results from regression formula for development based on temperature and photoperiod with the observation by field experiment in 1986, 1987 and 1991. The mean difference between observation and calculated results for the whole growing period was only 3.8 days.View full abstractDownload PDF (759K) -
Susumu ARIMA, Jiro HARADA, Noriyuki TANAKA1992 Volume 61 Issue 4 Pages 583-589
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDevelopment of fruits of Trapa bispinosa Roxb. cultivated in paddy fields was investigated from the viewpoint of nodal succession along a stem and of flowering time, and variability of valuable fruit weight was analyzed. Differentiation of flower buds, flowering, and growth of fruits proceeded together with increase in the number of leaves on the stem. The deviation in the phenomenon was small among the stems that flowered in August. By the comparison of the final weight of fruits whose flowering time differed, the existence of a time-limit in flowering for obtaining valuable fruits was noticed, and the effective flowering period was assumed to be from the first flowering time to mid-September. Furthermore, by the change of the ratio of valuable fruit number per flowers bloomed (RVNF), the period of flowering was classified into three stages : i. e. early (from first flowering time to late August), when the RVNF is high and stable ; middle (from beginning to mid-September), when the RVNF decreases ; and late flowering period (after mid -September), when the time of effective flowering reaches its limit and the RVNF becomes zero. In the early flowering stage, the variation in the final size and amount of fruits was small irrespective of the flowering time and the kind of stems. Also, a considerable percentage in total number of valuable fruits seemed to consist of the fruits whose formation had started at the early flowering stage, since the stage is much longer than the middle flowering stage. Consequently, the above-mentioned phenomenon is thought to be the factor contributing to the small variability in the size and amount of valuable fruits, stabilizing their average weight.View full abstractDownload PDF (926K) -
Susumu ARIMA, Jiro HARADA, Noriyuki TANAKA1992 Volume 61 Issue 4 Pages 590-596
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSTo clarify the influence of the composition of stems on valuable fruits production of a plant of Trapa bispinosa Roxb. cultivated in paddy fields, the distribution and the number of flower buds, the first flowering time and the number of valuable fruits on each stem were investigated. Their changes by planting density and the timing of shading were also examined. A significant distributing pattern of flowers was observed in every stem where 1 to 2 nodes having flower buds (flower nodes : FN) and 4 to 10 nodes not having flower bud (non-flower nodes : NFN) succeeded alternately. In this pattern, the number of NFN per NFNG (non-flower node group) showed a tendency to decrease at higher parts of a stem. Therefore, the condition for fruit ripening conditions at lower FN, in which the flowers bloom at the early flowering stage, was assumed to be better than that at upper FN. When the fruit productivity of each stem was compared, the lower the nodes along the mother stem from which the stem emerged, the larger the number of valuable fruits produced on the stem, and the higher the productivity. Among these stems, the number of fruits which had started their ripening in the early flowering stage was considered to be larger. Moreover, as a result of low planting density (below 7.1/m2) and early shading in June, the first FN on every stem became higher. Therefore, the percentage of stems of lower branching order and from lower nodes would decrease in the plants. In consequence, it was clarified that the lowering of branching order and the increasing of the stems emerging at an early stage in the stem composition are important factors for the production of a large number of valuable fruits and for the increase in the yield of a plant.View full abstractDownload PDF (784K) -
Tatsuro HIROSE, Takeshi IZUTA, Hiroshi MIYAKE, Tsumugu TOTSUKA1992 Volume 61 Issue 4 Pages 597-602
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSFactors causing the cyclic changes in the rates of net photosynthesis and transpiration of peanut plants were examined. In order to clarify the relationship between the transpiration demand and the occurrence of the cyclic changes, relative humidity (R.H.) of the air introduced into the assimilation chamber was altered. When R.H. (at 25°C) of the air at the entrance of the assimilation chamber was 25±5%, about 90% of the plants showed the cyclic changes in the net photosynthetic rate and the transpiration rate. However, only a few plants showed the cyclic changes when R.H. of the air was 65±5%. This implies that large transpiration demand due to low air humidity induced the cyclic changes in the rates of net photosynthesis and transpiration. When the transpiration of a part of the leaves was suppressed by covering with aluminum foil, the cyclic changes in the rates of net photosynthesis and transpiration were disappeared. Partial excision of the root system of the plants which did not show the cyclic changes even in the low humidity air, induced the cyclic changes. These results suggest that both the large transpiration demand and the low capacity of water supply are important factors in the occurrence of cyclic changes in the rates of net photosynthesis and the transpiration of peanut plants. Possibly, individual differences in the appearance of the cyclic changes under low air humidity were associated with the water uptake ability of individuals.View full abstractDownload PDF (759K) -
Akihito KUSUTANI, Koh-ichiro ASANUMA, Kiyoshi KOGURE, Manabu SEKI, Sou ...1992 Volume 61 Issue 4 Pages 603-609
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe effects of the transplanting times and the methods of feritilizer application on the yield and eating quality of rice cultivar Kinuhikari were investigated. The transplantings were made on March 28 (early season culture, ES) and on June 17 (normal season culture, NS). The methods of fertilizer application were the heavy manuring culture (HM), the standard manuring culture (SM) and the organic manuring culture (OM). 1) The averages of the daily mean temperature from the heading time to the maturing time were 26.9°C in ES and 24.6°C in NS. 2) The yield in ES was higher than that in NS. The number of grains per m2 indicated significant positive correlation with the yield and significant negative correlation with the percentage of ripened grains, respectively. The percentage of ripened grains in ES was higher than that in NS at the same lavel of the number of grains. 3) In ES, amylose content was lower but maximum viscosity and breakdown values were higher than those in NS. The order of protein content in relation to the method of fertilizer application was ; HM>SM>OM. The protein content showed significant negative correlation with the percentage of ripened grains. 4) The palatability of rice after cooking showed significant negative correlation only with protein content. In this experiment, the palatability of rice after cooking was more strongly affected by the method of fertilizer application than the transplanting time.View full abstractDownload PDF (819K) -
Akiko SATO, Kazuhiro SUENAGA, Kazumi KAWAGUCHI1992 Volume 61 Issue 4 Pages 610-615
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThis research was conducted with three varieties (Asakazekomugi, Norin 61 and Norin 64) in Red Soil, Thick High-humic Andosol and Light-colored Andosol. In Red Soil the survival and grain yield of tillers was increased in three varieties by the three times of nitrogen topdressing. In Norin 61 and Norin 64 nitrogen topdressing increased extremely the emergence of TR (tillers that emerged since the middle of the tillering stage, and their survival rate was very low). This higher emergence rate of TR resulted in rank growth and increased lodging. In Asakazekomugi, nitrogen topdressing did not increase the emergence of TR and lodging, resulting in higher grain weight per spike. In the two Andosols, the emergence of tillers was increased and the grain yield of Tc (coleoptile tiller), T1, T2, and T3 (tillers in axils of the first, second and third main stem leaves) were increased by the additional application of 50kg/10a P2O5. Norin 64 had higher emergence and survival rate in T1 and higher yield than the other two varieties in Andosols which were phosphoric-acid-deficient soils. Since the T1 of Asakazekomugi and Norin 61 emerged and were ear-borne by the additional application of 50kg/10a P2O5 in Andosols, the varietal difference of grain yield was smaller than control.View full abstractDownload PDF (661K) -
Akiko SATO, Atsushi OYANAGI, Kazuhiro SUENAGA, Osamu WATANABE, Kazumi ...1992 Volume 61 Issue 4 Pages 616-622
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe quality of Asakazekomugi and Norin 61 cultivated in Grey lowland soil (GLS), Red soil (RS), Thick Hi-humic Andosol (THA) and Light-colored Andosol (LCA) were examined. Grain and flour crude protein contents, water absorption (Ab.) of Farinogram and viscoelasticity of eating test of noodle of wheat cultivated in RS were lowest. The wheat cultivated in THA and LCA had lower grain ash contents and higher grain and flour crude protein contents than those in other soils. The elasticity of dough of wheat cultivated in THA and LCA were greater than that in other soils. Grain yield and crude protein content in RS increased by the application of stable manure and top-dressing of nitrogen. In THA and LCA, grain yield increased and protein contents decreased by the application of stable manure and phosphoric-acid. Consequently, the crude protein contents had been appropriate values in these soils. The lightness of flour and noodle color of wheat cultivated in THA and LCA were improved by the application of stable manure and phosphoric-acid. In LCA, eating test score of Asakazekomugi and Norin 61 were increased. In RS and THA, eating test scores of Norin 61 were also increased by the improvement of fertilizer application.View full abstractDownload PDF (739K) -
Kiyoshi TAKAHASHI, Hiroyuki OTAKE, Kiyochika HOSHIKAWA1992 Volume 61 Issue 4 Pages 623-628
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSPlants were grown in pots containing soil. Every tiller was cut off when it emerged and only the main shoots were allowed to grow. Exp. 1. Plants in pots were artificially placed horizontally at different growth stages and the pots were kept in a horizontal position until the shoot kneeing was compoeted. The shoots were completely recovered by their kneeing abilities in the pulvini to a vertical position when the plants were placed horizonatlly between 7th leaf-stage (plants had 7 leaves on a main stem) and the time of panicle heading. Then the plants gradualy lost their kneeing ability during the time of grain ripening. With an increase of growth stages the position of the responded pulvinus was elevated and the number of pulvini that responded was decreased. The persistency of kneeing ability of each pulvinus of the elongated internode was longer than that of non-elongated internode. Exp. 2. The bending up of a shoot was increased when their panicles were cut off at the same time when lodging treatments started. However, it was decreased when the panicles were cut off 2-3 weeks before the lodging treatments. In addition the silica accumulation in the responded pulvinus was enhanced by the panicle removal. These results suggest that the increase in a panicle weight and the accelerated deposition of silica in the pulvinus depresses the movement of the rice shoot axes to upright position.View full abstractDownload PDF (762K) -
Jiro HARADA, Noriyuki TANAKA, Susumu ARIMA, Seizaburo SAKAI1992 Volume 61 Issue 4 Pages 629-634
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSTwo separate effects of Inabenfide on the formation of branch roots in rice plants (Oryza sativa L.) were investigated, using a special apparatus constructed with a Wagner pot (1/2000 a) divided into five compartments. Rice, cv. 'Koshihikari', was grown in the centrally situated porous stainless steel cylinder and, after treatment, roots were made to grow into four equivalent outer sectors. In the treated pots, one sector was untreated and the other three sectors were treated with Inabenfide (5% Seritard-granule 5(R)) in different concentrations and then compared to the untreated pots. A remarkable increase was seen in the total length of branch roots per primary root and per unit length of primary root in the untreated sector of the treated pots as well as in the treated sectors of the same pot. In this case, the relative ratio estimated for the increase in the untreated sectors of the treated pots compared to the untreated pots marked a positive value. On the other hand, when the effect of Inabenfide that may affect the place of application was evaluated by comparing the treated and untreated sectors in the treated pots, the relative ratio against the untreated pots marked negative values. A contrary phenomenon was observed in the case of root dry weight per unit length of total roots. Consequently, it was indicated that although Inabenfide inhibits the growth of branch roots directly in the treated soil, it promotes the growth indirectly in the other parts of the application. As the sum of these opposing effects, the overall promotion throughout the root system observed in the previous study might be realized.View full abstractDownload PDF (728K) -
Thomas Basuglo BAYORBOR, Kiyoshi KOGURE, Koh-ichiro ASANUMA, John ANIM ...1992 Volume 61 Issue 4 Pages 635-641
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSA glasshouse pot sand culture experiment was conducted to determine the effects of three levels of combined nitrogen-0N (0), 1N (100), 2N (200 pm) -on nitrogen nutrition, seed protein and oil content and the distribution pattern of 14C activity in the seed at different nodal position of soybean (Glycine max (L) Merr. cv. Akiyoshi). Plants were fed with 14CO2 at the vegetative, flowering, early pod filling and late pod filling stages of growth. Nitrogen content of plant organs increased with increasing level of supplied nitrogen and declined in the vegetative organs with plant growth. Combined nitrogen had no significant effect on mean seed protein and oil content. No 14C activity was detected in seeds of plants fed at the vegetative and flowering stages. More 14C was retained in seeds of plants fed at late pod filling stage than fed at early pod filling stage. Combined nitrogen had no remarkable effect on the amount and distribution pattern of 14C. Activity of 14C in seeds was in the order of secondary branches<main stem<primary branches. Excessive combined nitrogen had little effects on the seed yield and sysnthesis of protein and oil components in seeds.View full abstractDownload PDF (957K) -
Tiemi NAKAMURA, Takeshi TANIGUCHI, Eizo MAEDA1992 Volume 61 Issue 4 Pages 642-650
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe external morphology and internal anatomy of coffee leaf blade were investigated by light and scanning electron microscope. The domatia presented a round or elliptical shape and they were located at the intersection between the midrib and secondary veins on the abaxial side of the leaf blade. At the border, and in the vicinity of the domatium pore, unicellular trichomes measuring 36 μm to 143 μm in length were observed. The pocket-type domatium was clearly defined for arabica coffee leaves by serial sectioning observation. The domatium cavity was always larger than the aperture. Our interest in studying the domatium structure was due to its importance for the tissue culture explanting of coffee leaves, since no sterilizing solution can penetrate inside the domatia. In addition, the coffee vascular and mesophyll structures were studied. The presence of hypodermal cells containing dark stainable materials were illustrated in regions near the midvein or secondary veins of coffee leaves.View full abstractDownload PDF (1824K) -
Kano KOIDE, Kuni ISHIHARA1992 Volume 61 Issue 4 Pages 651-658
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSIn order to clarify the response of crop to sink restriction, we examined the effect of ear removal on dry matter production, its partitioning into various organs and nonstructural carbohydrate content of the flag leaf during grain filling in wheat and barley with different inflorescences. In both crops, there was no significant difference in the total dry weights of the control and no-ear plants from ear removal treatment to the harvesting stage. The weights of leaf blade, leaf sheath, roots, stem and late tillers that developed after ear removal increased after ear removal. Although the weight of stem plus leaf sheath did not decrease until the maturation stage in the no-ear wheat, the weight in the no-ear barley decreased to the same extent as in the control plants. The increase in the late tillers in barley was larger than in wheat. The increase in weights of leaf blade and leaf sheath was larger at the upper leaf position in wheat, but was the same among the leaves at different positions in barley. The increase in the weight of the flag leaf after ear removal was mainly due to the increase in sucrose in both crops. The increase in sucrose was larger in wheat than in barley, while the increase in glucose and fructose began earlier and was larger in barley than in wheat.View full abstractDownload PDF (801K) -
Kano KOIDE, Kuni ISHIHARA1992 Volume 61 Issue 4 Pages 659-667
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSIn order to clarify the response of crops to sink restriction, we examined the effects of ear removal on photosynthesis of the flag leaf in wheat. For 11 days there was no difference in CO2 exchange rates between the control and the no-ear plants after ear removal, but after 11 days the rates in the no-ear plants were higher. For 11 days there was no difference in diffusive conductance, apparent quantum yield (AQY) and apparent carboxylation efficiency (ACE) and chlorophyll contents between the plants. Though there was no difference in diffusive conductance, AQY and chlorophyll contents between the plants after 11 days, ACE and ribulose-1, 5-bisphosphate carboxylase/oxygenase contents in the no-ear plants were higher than those in the control. Therefore, it was presumed that activity of CO2 fixation system in the no-ear plants was higher and that flag leaf senescence was delayed due to ear removal.View full abstractDownload PDF (911K) -
Totik Sri MARIANI, Hiroshi MIYAKE, Takeshi TANIGUCHI1992 Volume 61 Issue 4 Pages 668-675
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSHigh yield of protoplast was obtained from the green callus tissue of finger millet at one week after subculture on MS medium with 0.2 mgl-1 2, 4-D and 0.1 mgl-1 kinetin. The protoplasts were released using the enzyme solution containing 2% Cellulase YC and 0.2% Pectolyase Y-23. About 75% of the protoplasts cultured in the MS liquid medium with 0.4 mgl-1 2, 4-D and 0.1 mgl-1 kinetin supplemented with 5% coconut water were started to show regeneration of the cell wall within 12 h. Cell division was observed within 24 h after culture. The protoplasts that underwent division were about 15%. The sustained cell division could lead to microcolony formation in 4 d after culture. However, further growth did not occur and viability gradually decreased during culture.View full abstractDownload PDF (1016K) -
Mikio TSUCHIYA, MUNANDAR, Tatsuo OGO1992 Volume 61 Issue 4 Pages 676-682
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSTranspiration of a rice plant under a low water potential of rooting medium and low air-humidity conditions was studied in order to evaluate varietal difference in response to water stress. Water stress in the rooting zone was induced by polyethylene glycol 6000, and the whole plant's transpiration was determined gravimetrically under different air-humidity conditions. Varietal difference in maintaining transpiration under water stress was observed, and the difference was significant under conditions of air humidity less than 45%. Transpiration measurement of plants exposed to low water potential of rooting medium under the low air-humidity was an effective method for evaluating varietal characteristics in water-use behavior. Based on the decrease of transpiration and leaf-water content (LWC), 13 rice varieties could be classified into three groups : tolerant, moderate and susceptible to water stress. Under water stress conditions, tolerant varieties had more characteristics for maintaining higher transpiration and LWC than susceptible varieties. Varietal difference may arise from the differences in sugar accumulation between plants, which may be a result of degradation of starch during water stress. Varieties in which sugar content increased more during water stress could maintain a higher transpiration and LWC than those which accumulated less sugar. An ability to convert starch to sugar during water stress might be a characteristic related to drought tolerance in rice.View full abstractDownload PDF (736K) -
Makoto NAKATANI, Michitaka KOMEICHI1992 Volume 61 Issue 4 Pages 683-684
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDownload PDF (378K) -
Makoto NAKATANI, Toshiaki MATSUDA1992 Volume 61 Issue 4 Pages 685-686
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDownload PDF (822K) -
Fumitake KUBOTA, Ritva KNOF, Michio YATOMI, Waichi AGATA1992 Volume 61 Issue 4 Pages 687-688
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDownload PDF (352K) -
Shigenori MORITA, Koou YAMAZAKI1992 Volume 61 Issue 4 Pages 689-690
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDownload PDF (358K) -
Jun INOUYE, Toshiaki NISHITANI, Toshihiro MOCHIZUKI, Takashi ORITANI1992 Volume 61 Issue 4 Pages 691-692
Published: December 05, 1992
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDownload PDF (394K)
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