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Volume 65 (1996)
- Issue 4 Pages 569-
- Issue 3 Pages 425-
- Issue 2 Pages 173-
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Volume 65, Issue 1
Displaying 1-24 of 24 articles from this issue
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Dong-Ha CHO, Ryoichi ITOH, Ryuichi ISHII1996 Volume 65 Issue 1 Pages 1-7
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe mechanism of cultivar difference in salt tolerance was investigated with Korean rice cultivars, paying special attention to the relationship between sodium (Na) and potassium (K) ions in various organs. Three tolerant and three sensitive cultivars, with Nipponbare and IR8 as the reference cultivars, were cultured in solutions containing different concentrations of NaCl. The Na ion concentration in the leaf blade, leaf sheath and root increased with increasing NaCl in the culture solution in all cultivars. Furthermore, with increasing Na ion, the K ion concentration decreased in the root and leaf sheath. Conversely, in the leaf blade, the K ion concentration increased with increasing Na ion. No relationship between thc extent of accumulation of Na and K ion in the leaf blade and salt tolerance was observed, hence, these findings do not support the hypothesis that salt tolerance is related with the exclusion of K ion by absorbed Na ion in the leaf blade. However, exclusion of K ion by Na ion in the root was round in all the cultivars tested, and extent of the K exclusion might be related to the salt tolerance in rice plants.View full abstractDownload PDF (687K) -
Naoaki TACHIBANA, Toshihisa IKEDA, Katsuhiko IKEDA1996 Volume 65 Issue 1 Pages 8-15
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSNitrogen absorption by mature tea plants was examined under different nitrogen levels. The annual increase rate of dry matter of five-year-old plants was 1.49 when no nitrogen was applied and increased with increasing nitrogen levels. The increase rate of seven-old tea plants decreased to one-half of that of five-year-old plants and differed a little among nitrogen levels. This means that seven-year-old plants have grown to the mature stage. The increase rate of dry matter of plants applied 180 kg 10 a-1 of nitrogen annually became lower than that of plants given 60 kg 10 a-1 of nitrogen. The amount of nitrogen uptake in five-year-old plants was 30 to 43 kg 10 a-1yr-1, but decreased 23 to 27 kg 10 a-1yr-1 in seven-year-old plants. Approximately 10 kg 10 a-1yr-1 of the nitrogen absorbed was estimated to derive from soil nitrogen produced by the decomposition of organic matter. When 60, 120 and 180 kg 10 a-1 of nitrogen was applied to seven-year-old plants, the uptake efficiency of nitrogen was 21.5, 13.8 and 9.9%, respectively. The amount of 15N absorbed after autumn application was so small that the ratio of the contribution to the first crop of the next year was 5 to 10%. However, the greater the amount of nitrogen supplied in both autumn and spring, the greater the amount of 15N was absorbed, and every organs showed a higher ratio of contribution. However, the nitrogen content of stems, thick roots and white roots remained at a lower level in the heavy applied plot. This was considered to be attributable to the root damage caused by a high concentration of salts in the rhyzospheres that results in restriction of nitrogen absorption.View full abstractDownload PDF (929K) -
Takahisa AMANO, Chang-Jun SHI, De-Lin QIN, Makoto TSUDA, Yasuhiro MATS ...1996 Volume 65 Issue 1 Pages 16-21
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSRice seedlings of cultivar Yu-Za 29 were planted by the conventional cultivation method with a planting density of 78.5 hills per m2 (dense planting) in Binchuan, Yunnan Province and achieved a paddy yield of 1, 664 gm-2, the sampling area being 700m2. In addition, a very high paddy yield of 1, 982 gm-2, the sampling area being 6m2 in total of three sub-plots, was recorded by reducing the planting density to about half of the conventional one (42.7 hills per m2, sparse planting). The average daily incident solar radiation during whole growing period (19.3 MJ m-2 d-1) was about 20% higher compared to the mean value (16.1MJ m-2 d-1) obtained in the five-year experiment of the Japanese International Biological Program (JIBP). On the other hand, the efficiency for solar energy utilization (Eu) of Yu-Za 29 for biological production during the whole growth period was higher by 28-50% in comparison with the average Eu (1.25%) of the five-year experiment of JIBP. Eu for grain production exceeded the highest Eu (0.59%) in the JIBP by 17-49%. In Yu-Za 29, the harvest index was estimated at more than 0.6 for top-dry weight over 2, 500gm-2 and the grain-straw ratio reached more than 1.4 for straw weight over 1, 180 gm-2. The spikelet number per m-2 was 71, 000 to 87, 700 and the filled-spikelet percentage was 76.0 to 76.2%. An increase in both components of dry-matter production and the partition ratio of dry matter to grains as well as the high percent of the filled spikelets, regardless of a very large number of spikelets, had been attained with the sparse planting comparing with dense planting.View full abstractDownload PDF (705K) -
Takahisa AMANO, Chang-Jun SHI, De-Lin QIN, Makoto TSUDA, Yasuhiro MATS ...1996 Volume 65 Issue 1 Pages 22-28
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe spikelets produced, amouting to as much as 71, 000 per m2 in a dense-planting plot, had been attained by combining of 487 panicles per m2 and 148.8 spikelets per panicle. The panicle number per m2 was almost the same as the culm number per m2 at transplanting. In a sparse-planting plot, the panicle number per m2 did not decrease but increased in the spikelets per panicle up to 180.9, and thus 87, 700 spikelets per m2 were obtained. The efficiency of spikelet production for Yu-Za 29 was apparently higher than Nipponbare cultivated in Kyoto. The significantly large number of spikelets per m2 was attributed to both a more efficient use of nitorgen in producing spikelets and increases in nitrogen absorption up to heading (23.4 to 23.6 gm-2) and in leaf dry weight at heading (328∼333 gm-2). Efficiency of nitrogen use in producing spikelets of Yu-Za 29 was higher in sparse-planting plots than in dense-planting plots. No differences in culm lengths and internode lengths lower than the 3rd one (N3) were observed between the planting densities, but breaking resistance of N3 and N4 lowered in the dense planting plot. Consequently, the lodging index of N3 (distance between fulcra is 5cm) exceeded 200. Improvement of nitrogen use efficiency in producing spikelets as well as high resistance to lodging in Yu-Za 29 are considered to be compatible with an increase in the sparsity of the planting density in comparison with the conventional dense planting cultivation in Binchuan.View full abstractDownload PDF (787K) -
Akiko SATO, Atsushi OYANAGI, Michihiro WADA1996 Volume 65 Issue 1 Pages 29-34
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSGrain and flour of Asakazekomugi and Norin 61 cultivated in Gray lowland soil, Red soil and Thick High-humic Andosol were analyzed for N, P, K, Mg, Ca and Mn contents. Ash content was compared with the content of these minerals. N, Mg and Ca contents were lower but Mn content was higher in grain of wheat cultivated in Red soil than in those in Gray lowland soil. N, P and Ca contents were lower but K and Mn contents were higher in flour of wheat cultivated in Red soil than in those in Gray lowland soil. P, K, Mg and Ca contents were lower in grain of wheat cultivated in High-humic Andosol than in those in Gray lowland soil. N content was higher but P, Ca and Mn contents were lower in flour of wheat cultivated in High-humic Andosol than in those in Gray lowland soil. Differences in ash content of wheat cultivated in three soil types was due to the differences of P, K, Mg, Ca and Mn contents. Increase of P, K and Mn contents by the application of phosphoric-acid in High-humic Andosol resulted in the increase of ash contents in grain and flour.View full abstractDownload PDF (688K) -
Akiko SATO, Atsushi OYANAGI, Michihiro WADA1996 Volume 65 Issue 1 Pages 35-43
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe relationship between quality and mineral contents in grain was investigated with Asakazekomugi and Norin 61 cultivated in 4 soil types: Gray lowland soil, Red soil, Thick High-humic Andosol and Light-colored Andosol. There were negative correlations between potassium content and 1000-grain weight (r=-0.49**∼-0.80**), or test weight (r=-0.80**∼-0.90**). Since test weight was related to milling quality, potassium content probably affects milling efficiency. There were negative correlations (r=-0.79**∼-0.95*) between nitrogen content and brightness and chroma of grain color. Brightness and chroma of. grain color were decreased with increase of nitrogen content. There were negative correlations (r=- 0.45*∼-0.64**) between potassium content and whiteness of flour color. Whiteness of flour color was also correlated with 1000-grain weight (r=0.47*∼-0.80**) and test weight (r=0.50*∼0.78**). In the plots which 1000-grain weight were over 33g in Asakazekomugi and 32g in Norin 61, there was low correlation in only Asakazekomugi (r=-0.31*) between whiteness of flour color and potassium content. These results indicate that decrease in 1000-grain weight and test weight with the increase in potassium content decreased milling efficiency and increased broken pieces of bran in flour and decreased whiteness of flour color. There were significant correlations between extensibility or the ratio (R/E) of microextensogram and nitrogen content or the N·Mg/K ratio. Since the improvement in available phosphoric acid in Andosol decreased 1000-grain weight and test weight. it seems to decrease milling efficiency.View full abstractDownload PDF (851K) -
Kentarou FURUSAWA, Kiyoshi TAKAHASHI, Kiyochika HOSHIKAWA1996 Volume 65 Issue 1 Pages 44-50
Published: March 05, 1996
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 and the bending degree of lamina joints and pulvini was investigated. The artificial placement in the horizontal direction increased the bending degree of lamina joint and pulvini. In the treatment in which pots were placed horizontally and then turned upright, the bending degree of pulvini was decreased, but that of lamina joint was not changed. Exp. 2. The response direction of the torsion in the leaf sheath of rice placed horizontally was downward at a portion from the top to the center, while it was upward from the center to the bottom. Exp.3. The leaf blade was partly removed or added weight. The result suggested that the leaf blade weight influenced the degree of torsion. When the weight of the leaf blade which was set sideways was released, thc degree of torsion decreased. Exp.4. In the temperature treatment, the low temperature decreased the torsion of the leaf sheath. This result suggested that the torsion of leaf sheath physiologically influenced by the temperature. It seems that the unit of "pulvinus=leaf sheath=lamina joint" was a response to gravity.View full abstractDownload PDF (787K) -
Koji KAWAGISHI, Toyoo MIURA1996 Volume 65 Issue 1 Pages 51-57
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe growth characteristics of spring-planted edible lilies, grown in pots and fields, were investigated. The effect of nitrogen and potassium topdressing on the thickening growth of the bulbs was also examined. The growth period of the edible lily could be divided into the following four stages. In the first stage, from planting to sprouting, the foliage grew using the materials stored in the bulb. In the second stage, from leaves expanding to flower bud appearing, the foliage vigorously developed and started to transfer photosynthetic products from the above ground parts to the subterranean parts. The third stage was from flower bud expanding to middle August, which would be flowering time unless being disbudded. In this stage, the leaf area and dry weight of the tops continued to increase, and the old bulb increased dry weight most vigorously among the subterranean organs. In the fourth stage, from middle August to harvesting, the growth of the foliage almost stopped, and the new bulb mainly showed the increase of dry weight. By a nitrogen and potassium topdressing after the flower bud appeared, the root growth became more active, and the nutrient absorption and the dry matter production continued until the latter growth stage. Therefore, the topdressing resulted in the continuous growth of bulbs during the fourth stage, and consequently increased the yield.View full abstractDownload PDF (843K) -
Tomohiko YOSHIDA, Kotaro SUMIDA1996 Volume 65 Issue 1 Pages 58-62
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSMass selections for germination at low temperature, heavy grain weight and early heading were applied in a pearl millet population. Selection for short plant height was also applied by the ear-to-row method. Heritability estimated from the genetic gain were 0.26, 0.04 and 0.77 for germination, grain weight and heading, respectively, No genetic gain was obtained for plant height. Grain yield of original population (C0), population after one cycle of selection (C1) and two cycles of selection (C2) for early heading were compared, Yield was 371-511 gm-2 for May planting and 164-239 gm-2 for August planting. The population selected for early heading had more ears and a higher grain yield than C0. The difference between C1 and C2 was not significant. No significant interactions for traits studied between planting density and cycle of selections were detected.View full abstractDownload PDF (655K) -
Akio SUMI, Mitsunori OKA, Susumu HAKOYAMA, Waichi AGATA, Tomoshiro TAK ...1996 Volume 65 Issue 1 Pages 63-70
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe research was conducted to analyze the relationships between sink capacity expressed by hull weight per hill (SW) and culm length (CL) and weight of hulls per panicle (hW, ). hW and CL were adopted as indices showing whether a variety is panicle number type or panicle weight type, or whether it is long culm type or short culm type. The relationships between the tiller number at maximum tillering stage (X3) and CL. (X1)and hw (X2) are expressed by the following equation: X3=A-B·X1-C·X2 (A, B, C; coefficients). Between the percentage of productive tillers (y) and X2 and X3, the following relationship could be found: y=α-(β+γlnX2) exp (δX3) (α, β; γ, δ; coefficients). From these equations, it was supposed that: 1) smaller hW varieties increase remarkably in panicle number per hill (PN) as CL shortened, but in larger hW varieties, the dwarfing is not always associated with the increase in PN; 2) shortening CL causes the remarkable increase in SW in smaller hW varieties; and 3) the optimum CL where maximum SW is produced becomes higher as hW become larger up to a limit, but when hW exceeds it, dwarfing is once again associated with the increase in SW. It was assumed that the larger SW observed in 'Tong il' varieties was induced both by shortening of the culm and enlargement of the panicle.View full abstractDownload PDF (819K) -
Noriyuki TANAKA, Susumu ARIMA1996 Volume 65 Issue 1 Pages 71-76
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSEffects of planting density on the formation of the root system and the relative growth of the top and root in rice plants were investigated. The four planting densities used were 45, 70, 95 and 120 hills per 3.3m2. The results obtained are follows: (1) The top-root ratio increased with increasing planting density, and thus the relative inferiority of root growth to top growth was amplified. (2) The root weights per unit area showed unimodal type time-course changes, which indicated the maximum weight immediately after the maximum tiller number stage, in the high density plots (95 and 120 hills), whereas in the low density plots (45 and 70 hills) they showed bimodal type time-course changes in which the root weights rose just after the maximum tiller number stage as well as at the heading stage. (3) The root system distributed in the surface soil layer became higher in ratios as the planting density increased. However, the roots in the surface soil layer in the high density plots decreased the weights strikingly in the later growth stages. (4) The total number of crown roots per unit area increased with increasing planting density, while the diameter of crown roots indicated a decreasing tendency.View full abstractDownload PDF (702K) -
Yutaka TASHIRO, Tetsuro TANIYAMA1996 Volume 65 Issue 1 Pages 77-86
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSOkinoerabu Island is one of the typical agricultural districts in Southwest Islands of Japan. More than three times as much pesticides as the nationwide average are consumed on each unit area of land for floriculture and other intensive agricultures in Wadomari-town, on the northeast half of this island. The contamination with pesticides (fenitrotion, diazinon, prothiofos and captan) in 115 groundwater samples at 33 locations on this island were determined. Fifteen samples at eight locations were found to contain some of these four pesticides. This result indicates that the groundwater can be polluted by pesticides used for intensive agricultures. Among the four analysed pesticides, the amount of captan used was the greatest in Wadomari-town. However, it was found in only two groundwater samples. These are located in the northeast part of this town, where the intensive floriculture is more extensive. The contaminations with fenitrotion and diazinon were detected in the samples from various locations throughout all seasons. In addition, the ratio between the concentrations of these two pesticides in the samples from one significantly polluted point did not vary fundamentally whenever they were detected. This result suggests that these pesticides penetrate to the groundwater rather constantly and slowly in this island.View full abstractDownload PDF (962K) -
Takefumi OGATA, Yuji MATSUE1996 Volume 65 Issue 1 Pages 87-92
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThis study was undertaken to find the evaluation method of lodging tolerance under direct sowing culture in flooded paddy field for the selecting of good eating quality rice cultivar well adapted to direct sowing culture in Northern Kyushu. Under direct sowing culture, lodging degree showed a significant (P<0.01) positive correlation with pushing resistance. This result indicates that it is possible to use pushing resistance as an indicator of lodging tolerance under direct sowing. Pushing resistance under transplanting culture showed a significant (P<0.01) position correlation with the pushing resistance under direct sowing culture, and further showed a significant (P<0.01) positive correlation with the lodging tolerance under direct sowing culture. Therefore, the lodging degree under direct sowing culture could be evaluated by pushing resistance under transplanting culture. These results lead to the conclusion that selecting high lodging tolerance cultivar adapted to direct sowing culture is possible without direct sowing by taking an accurate measurement of pushing resistance under transplanting culture.View full abstractDownload PDF (685K) -
Jose R. PARDALES Jr., Celia B. ESQUISEL1996 Volume 65 Issue 1 Pages 93-97
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe effect of different time and duration of progressive drought on cassava, during the establishment stage, i.e., from planting to about three months after planting, was studied with special attention to root system development. Plants exposed to drought, regardless of whether early (from 9-44 days after planting (DAP)) or late (from 44-82 DAP), in the establishment period had significantly fewer leaves and lower shoot dry weight (DW) than well-watered controls. Late droughted plants manifested similar inhibition of shoot growth with those continuously droughted from 9-82 DAP. With regards to root development, early drought caused reduction in the number and length of adventitious roots, number of first, second and third order lateral roots and total root DW. The value of these parameters generally increased after the plants were rewatered. Late drought caused reduction in the number and length of the adventitious roots, and the number of first and second order lateral roots, but not the third order lateral roots, which appeared to be promoted instead by drought. The total root DW also increased in late-droughted plants due to the thickening of adventitious roots. Overall, the results show that cassava has sensitivity to drought stress during its establishment period.View full abstractDownload PDF (596K) -
Juliarni, Kiyochika HOSHIKAWA1996 Volume 65 Issue 1 Pages 98-102
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSTwo clones of apios, red vine and green vine clones, were grown in 1993 to clarify their dry matter production and yield capacity. There were differences in dry matter production and yield between the two clones. With regard to maturity, the red vine clone showed the characteristics of an early maturity, while the green vine clone showed those of a late one. Flower bud formation and tuber initiation occurred earlier in the red vine clone than in the green vine clone. The LAI and CGR of both clones increased continously with time during growth. The red vine clone showed higher LAI and CGR than the green vine clone after 63 DAP (days after planting). Progressive increase in the tuber growth rate (TGR) of the red vine clone took place after 98 DAP, while in the green vine clone it occurred about 2 months later i.e. after 168 DAP. NAR of the red vine clone was relatively higher than that of the green vine clone at 63 DAP, but after 98 DAP, decreased more sharply compared to the green vine clone, due to mutual shading as leaf area progressively increased in the red vine clone. The shoot of red vine clone deteriorated at 191 DAP, while that of the green vine clone occurred at 217 DAP. Concerning final yield, the red vine clone produced a relatively higher yield than the green vine clone.View full abstractDownload PDF (627K) -
Fu-Sheng THSENG, Fwu-Fenn Hou, Kazuyoshi TAKEDA1996 Volume 65 Issue 1 Pages 103-107
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSTwenty-four soybean (Glycine max (L.) Merr.) varieties were used to investigate the relationship between flooding tolerance, water uptake of seed and elongation force in the period of seed germination. The germination rates after 4 days soaking at 25°C under flooding stress are regarded as the index of seed flooding tolerance. Flooding tolerance differed significantly from 0∼100% among soybean varieties. Water uptake types of soybean seed were able to be divided into quick absorption and slow absorption types. The relationship between water uptake and flooding tolerance was not significant under seed flooding stress. Elongation force of seedling (maximun weight displacement of seedings) differed greatly among varieties. The relationship between flooding tolerance and elongation force of seedlings was not significant.View full abstractDownload PDF (541K) -
Kunio OKANO, Kiyoshi MATSUO, Daisuke HIROSE, Jiro TATSUMI1996 Volume 65 Issue 1 Pages 108-113
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSPhotosynthesis and canopy structure of a mechanically-plucked tea bush were investigated in spring to clarify the role of overwintering leaves in growth of first flush shoots. After bud break, light interception by the overwintering leaves on the autumn skiffing surface declined gradually due to shading by elongating new shoots, and leaves began to show the features of shade-leaves. Photosynthetic activity of immature leaves on the first flush shoots increased sharply after sprouting and reached the same level as overwintering leaves at the plucking stage. Measurement of 13CO2 fixation by the tea bush showed that at the plucking stage, nearly 90% of canopy photosynthesis was conducted by developing new leaves and contribution of overwintering leaves was only 10%. The results indicate that although canopy photosynthesis is entirely carried out by overwintering leaves at the bud break stage, their contribution decreases gradually with the growth of first flush shoots, and at the plucking stage, most canopy photosynthesis is carried out by developing new shoots. Thus, growth of the first flush of mature tea bush would depend not only on reserve carbohydrates and photosynthesis by the overwintering leaves, but also on photosynthesis by growing new shoots themselves.View full abstractDownload PDF (659K) -
Naoko NAKAJIMA, Atsuhiko SHIDA, Susumu TOYAMA1996 Volume 65 Issue 1 Pages 114-118
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSEffects of epibrassinolide (EBR), one of the brassinosteroids (BRs), on culture of Chinese cabbage mesophyll protoplasts were researched. The addition of EBR to the liquid culture medium increased the cell division rate and the amount of soluble protein of the protoplasts during culture. These results showed that EBR enhanced cell reproduction of Chinese cabbage mesophyll protoplasts. EBR 10-1 mg/L was especially effective. After 3 weeks of culture, there were more cell clusters in the petri dishes containing EBR than in those not containing EBR. The number of clusters increased in direct proportion to the EBR concentration. The clusters in liquid medium were transferred to agarose solidified medium which contained the same concentration of EBR as liquid culture, and after that colony formation was observed. As the result, the addition of 10-1 mg/L EBR obviously enhanced colony formation of the protoplasts. It was shown that EBR was effective in multiplication of the protoplasts.View full abstractDownload PDF (599K) -
Katsumi SUZUKI, Hiroshi MIYAKE, Takeshi TANIGUCHI, Eizo MAEDA1996 Volume 65 Issue 1 Pages 119-130
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSThe development of the radicle at the basal portion of rice rygotic embryos was studied. Median sagittal sections and transverse sections indicated that a radicle tip arose at the ventral side of the embryo 5 DAA (days after anthesis), apparently inducing the dorsiventrality of the embryo. A radicle was connected to a shoot tip by curved vascular strands, and the distance between the radicle tip and the shoot tip was about 300μm when measured in a straight line. It was demonstrated that the radicle contained root cap, root epidermis, cortex and central cylinder. The radicle's subapical initials originated a root cap, which was formed of more-or-less regular columellae of cells. Coleorhiza enveloped columnar root cap, by which the radicle tip was shown to comes first endogenously. The lateral surface of radicles was covered by a mucilaginous thick cell wall. Plasmodesmata were frequently seen in the cell walls of the cap and the epidermis, and additionally, in the walls separating the cap from thc epidermis. The position of embryos in the ovarian cavity in relation to the nucellar epidermis was transferred from the central to ventral side before these events. The initiation of shoot and root poles and the embryo size at the time are discussed in the context of the similarity of somatic embryoids to zygotic embryos.View full abstractDownload PDF (4133K) -
Md.Wahiduzzaman MIA, Akira YAMAUCHI, Yasuhiro KONO1996 Volume 65 Issue 1 Pages 131-140
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSRoot characteristics of 114 genotypes of six food legume species, i.e., chickpea (Cicer arietinum L.), cowpea (Vigna unguiculata (L.) Walp.), grasspea (Lathyrus sativus L.), lentil (Lens culinaris Medik.), black gram (Vigna mungo (L.) Hepper) and mung bean (Vigna radiata (L.) Wilczek) were studied to evaluate the inter- and intraspecific variations in root system structure. Eleven root and shoot characteristics of 10-day-old seedlings, raised in growth pouches in a growth chamber, were subjected to principal component analysis. The results indicated that the root system structure is determined mainly by taproot and lateral root lengths and lateral root density, in which the species varied significantly. Chickpea produced long individual lateral roots and cowpea produced a great number of lateral roots, which resulted in relatively large root system formation. Grasspea also developed relatively long lateral roots. In contrast, the formation of smaller-sized root system was due to a smaller number of lateral roots produced for lentil and shorter lateral roots for black gram and mung bean. Large genotypic variations in root characteristics were found within each species, particularly in cowpea and chickpea. The high-yielding, drought-tolerant or deep-rooting genotypes reported earlier tended to produce large root system. Significant correlations of root growth parameters between plants grown in growth pouches and soil indicated that the growth pouch technique can be a useful tool for screening of root characteristics.View full abstractDownload PDF (1031K) -
El Gaali EISA, Kazuhiko MAETA, Nobuhiro MORI, Yutaka KITAMOTO1996 Volume 65 Issue 1 Pages 141-142
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
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Kuniyuki SAITOH1996 Volume 65 Issue 1 Pages 143-144
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDownload PDF (381K) -
Si-Yong KANG, Shigenori MORITA, Koou YAMAZAKI1996 Volume 65 Issue 1 Pages 145-146
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDownload PDF (370K) -
Tomomi NAKAMOTO1996 Volume 65 Issue 1 Pages 147-148
Published: March 05, 1996
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSDownload PDF (367K)
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