巻号一覧
46 巻, 4 号
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北村 英一, 加藤 雄久, 宮崎 脩一1977 年 46 巻 4 号 p. 461-467
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーOn the relation between the moisture content and the storable term of rough rice, the materials which were cultured by different methods or harvested by different machines were studied. According to the deterioration developed on the rice surface in newly threshed fresh rough rice in storage, deteriorated rice grains were classified into three groups, the spotted rice, the opaque rice and the rotten rice. The storable term was shown by the time during which the total of deteriorated grain was less than 5%. 1. The suitability for storage of rough rice obtained from cultivation in the same condition of soil and climate was not affected by variety, the time of maturity or the stage to maturity, lodging, harvest machine or cropping district. (Fig 1, 2, 5, 6, 8) 2. The relation between the moisture content of rough rice and its storable term for ordinaly rice harvested in a fine year was as follows. The rice of moisture content 18% could be stored for 30 days without changes, the rice of 19% kept 20 days, of 20% kept 15 days, of 21% kept 7-10 days, of 22% kept 7days, of 23% kept 1-3 days. (11 of capacity, at 10-25°C of room temperature. Fig. 2) 3. The climatical environment from flowering time to mature stage considerably affected the suitability for storage of paddy, and the paddy from the fine climate districts or the fine years were better than in the rainy district ot in the rainy years.(Fig. 3, 7) 4. The late harvested rough rice in high moisture conditions was of worse suitability for storage than ordinary harvested, because in some of the stored rice, it had changed to the opaque. (Fig. 4)抄録全体を表示PDF形式でダウンロード (872K) -
北村 英一, 加藤 雄久1977 年 46 巻 4 号 p. 468-473
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーOn the deterioration in the storage term of newly threshed fresh rough rice, the causes for the development of spotted rice and opaque rice were studied. 1. In the case of mixing storage of newly threshed rough rice and panicles in high moisture, the former developed many spotted grains but the latter did not. Consquently, the development of spotted rice related directly with the threshing process. (Table 1) 2. The surface of the brown rice from the newly threshed paddy suffered much mechanical damage by the threshing teeth, and in the majority of these grains, the spot developed at the site and in the same form as the damaged point. (Table 2) 3. The matured panicles sterilized at the heading time and non-sterilized were threshed when they were fresh, and then stored in high moisture conditions. The former had fewer spotted grains than the latter, and there was mold development in the spotted parts of the grains. (Table 3, 4) 4. When the newly threshed rough rice was stored until heavily deteriorated, the percent of spotted rice was a little less than the percent of the mechanically damaged grain. (Table 6) 5. Therefore, the cause for the quantity of spotted rice is explained by the following three factors: the mechanical damage on the grain surface, the mold propagation and the moisture condition. 6. When the high moisture rough rice above 20% was stored for many days, the opaque grains developed slowly without mechanical damage to the grain surface or mold in the paddy. In the final period of storage, the dry matter weight of the grain decreased and some of these grains were infected with aspergillus. In cases when the more mechanically damaged grains were stored, they had more opaque grains than the non-damaged and the much less opaque rice appeared in low temperature (8°C) than in high (32°C) in storage. (Table 7, 8, 9)抄録全体を表示PDF形式でダウンロード (712K) -
関谷 福司1977 年 46 巻 4 号 p. 474-482
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーAn anatomical study was carried out on the differentiation and growth process of the tiller primordium and tiller bud in rice seedlings. The differentiation of the tiller primordium in rice seedlings is due to the repeated periclinal divisions of the initial cell which is placed in the inner side of the dermatogen cells at the base of shoot apex on the main stem (Fig. 1, 2), and before the base of the leaf margin of a leaf primordium grows as far as the opposite side of the shoot apex, the tiller primordium appears at the base of the shoot apex (Fig. 3, 4). And after that the base of the leaf margin develops surrounding the upper part of the tiller primordium (Fig. 1C, 3, 5 and 7A). The tiller primordium differentiates firstly a prophyll, and then the first leaf primordium in tiller bud appears at the position of 90 degrees opposite to the prophyll, and it forms itself into a complete tiller bud. The second leaf primordium in the tiller bud differentiates at 180 degrees opposite to the first leaf primordium, thereafter the leaf primordia of the tiller bud differentiate alternately (Fig. 6). Taken the leaf which emerges from the leaf sheath of the main stem as standard (N), the (N-1) node and the (N-3) node tiller bud differentiate the two leaf primordia in one leaf-emergence-period, and then the first leaf of the (N-3) node tiller bud appears out of the leaf sheath of the main stem (Fig. 7).抄録全体を表示PDF形式でダウンロード (2221K) -
平 春枝, 平 宏和, 斉藤 正隆1977 年 46 巻 4 号 p. 483-491
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーIn order to determine the effect of size of seed removed seed coat, variety, and crop year on the mineral composition, the potassium, phosphorus, magnesium, and calcium content was determined in 12 varieties in 1970 and 13 varieties in 1971 at the experimental field. The variety, as compared with the size of seed, was more influential on all the mineral content on dry basis and in ash. When the size of seed decreased, however, the calcium content on dry basis and in ash increased. On the effect of variety and crop year, the magnesium and calcium content on dry basis and the calcium content in ash were influenced by both of them and the phosphorus in ash by the latter. On 100 seeds on dry basis, the content of minerals was decreased with the decrease of size of seed.抄録全体を表示PDF形式でダウンロード (921K) -
幸田 泰則, 岡沢 養三1977 年 46 巻 4 号 p. 492-498
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーダイズカルスバイオアッセイ法を用いて, 生育中の馬鈴薯塊茎内に存在するサイトカイニンがいかなる種類のものであるかを検討した。ペーパークロマトグラフィ, セファデックスカラムクロマトグラフィおよびアルカリ性フォスファターゼ処理等により, 馬鈴薯塊茎内には下記の6種のサイトカイニンが存在することが判明した。(1) ゼアチン, (2) ゼアチンリボシド, (3) ゼアチンリボチド, (4) ゼアチングルコシド, (5) イソペンテニルアデニンリボシド, (6) イソペンテニルアデニンリボチド。これらの6種のサイトカニンの中で最も多量に存在するものは, ゼアチンリボシドであった。抄録全体を表示PDF形式でダウンロード (683K) -
佐藤 光政, 大山 勝夫1977 年 46 巻 4 号 p. 499-503
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーThe current year's shoot from the stump of a grafted nursery plant raised in a pot was pruned leaving the basal 3 to 5 cm on July 20. In the process of regrowth after pruning the following items were investigated 8 times for the period July 20 to August 28. They were dry weight of a storage organ formed of a stump and roots, that of newly developed lateral shoots, amylase activity in the bark of a stump, and carbohydrates content in a storage organ. Dry weight of a storage organ declined for a while after pruning, and then turned to an increase on the 20th day after pruning, whereas dry weight of lateral shoots which commenced to develop on the 9th day showed a tendency toward rapid increase on the 15th day (Fig. 1). Amylase activity in the bark of a stump increased to about 150% of the initial level on the 3rd and 6th day, when lateral buds remained dormant visually and then returned to the initial level on the 13th day (Fig. 2). Soluble sugars content in a stump as well as roots showed little change for 9 days after pruning, decreased to a minimum on the 13th day when new shoots began to grow and afterwards turned to an increase (Table 1). Starch content in a stump and roots exhibited remarkable decrease after pruning and turned to an increase after showing a minimum on the 20th to 30th day (Table 2). The amount of sugars in a storage organ decreased to 70% of the initial level on the 13th day, while that of starch less than 20% on the 20th day. In addition, the period required for sugars to turn to an increase was shorter than that required for starch (Fig. 3). From these results, some discussion was given on factors which could affect amylase activity in the bark of a stump after shoot pruning.抄録全体を表示PDF形式でダウンロード (587K) -
野口 勝可, 中山 兼徳, 高林 実1977 年 46 巻 4 号 p. 504-509
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーThe experiments reported here were designed to determine the effects of different cropping systems on the weed community. The cropping systems were wheat -upland rice, -peanut, -soybean and -corn (2 years continuous cropping) which were generally put into practice as inter-cropping system in the Kanto plain. Weed community consisted of large crab-grass (Digitaria adscendens Henr.), Chufa (Cyperus microiria Steud.), common lamb's-quarters (Chenopodium album L.), Polygonum spp., common purslane (Porturaca oleracea L.) and the others. The experiments were conducted extending from 1970 to 1973. 1. As the wheat-corn and wheat-soybean plots had strong weed competitive capacity, the growth of weeds was fewer than other plots during cropping season and in bare fallow after cropping. And the ratio of weed weight to total community weight was under 10% at the time of harvesting of summer crops. The wheat-upland rice plot was strong in weed competitive capacity and the ratio of weed weight to total community weight was under 10% when upland rice grew better. But the weed competitive capacity was weak when growth of upland rice was poor. The wheat-peanut plot was weak in weed competitive capacity and the ratio of weed weight to total community weight was about 50%. 2. The ratio of weeds in each plot emerged at the first summer cropping was large crab-grass about 30%, Chufa about 30%, common purslane and the others about 40%. The ratio of large crab-grass to total weed weight at the time of harvesting was over 80% except about 40% of upland rice. The ratio of large crab-grass to total weed emerged at the second cropping was over 40% in each plot, and its ratio of weed weight at the time of harvesting was larger than that of the first cropping. The dominance of large crab-grass was larger in each plot at the bare fallow in the third year. 3. The amount of weeds remarkably increased at the condition of bare fallow in the third year. These indicated that crop husbandry and cultivation method were playing an important part to weed supression. As the large number of weed emerged next spring in the plots which produced much weed dry weight at the harvesting, the importance of removal remaining weeds by hand could be emphasized, too.抄録全体を表示PDF形式でダウンロード (666K) -
平 宏和, 平 春枝, 古沢 典夫1977 年 46 巻 4 号 p. 510-515
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーThe nitrate nitrogen content of brown rice was investigated on the nonglutinous and glutinous types by lowland and upland polyethylene film mulching cultures of lowland rice at the Alpine Region Branch and the North Branch of the Iwate Agricultural Experiment Station and by upland and upland polyethylene film mulching cultures of lowland and lowland-upland hybrid rices at the Main Station. The nitrate nitrogen content of the brown rice contained approximately 0.4 to 0.5mg% on dry basis. However, the upland mulching culture gave higher nitrate nitrogen content in lowland brown rice as compared with the lowland culture. The average increasing index, i.e. (upland mulching culture/lowland culture)×100, of non-glutinous type, glutinous type and both types was 113.9, 108.0 and 112.3, respectively. The upland mulching culture also gave higher nitrate nitrogen content in lowland and lowland-upland hybrid brown rices as compared with the upland culture on the same manuring condition. The average increasing index, i.e. (upland mulching culture/upland culture)×100, is as follows : a) lowland brown rice: non-glutinous type 108.3, glutinous type 111.1 and both types 109.2. b) lowland-upland hybrid brown rice: non-glutinous type 112.8, glutinous type 106.0 and both types 109.0.抄録全体を表示PDF形式でダウンロード (669K) -
石井 龍一, 大杉 立, 村田 吉男1977 年 46 巻 4 号 p. 516-523
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーみかけの光合成の温度反応が異なるオオムギ, イネ, トウモロコシを用い, 温度とみかけの光合成の関係が決定される機構を明らかにすることを目的として実験を行なった。ガス代謝の測定は切断葉を用い, 閉鎖系の光合成測定装置により50 klxの照度の下で行なった。通常の空気(300 ppm CO2, 20% O2)の下でのみかけの光合成の最大値はオオムギで15℃に, イネでは25～35℃に, トウモロコシでは35℃に認められた。一方, 光合成におけるCO2固定のkey enzymeであるRuDPカルボキシラーゼ活性は, 40℃まで温度の上昇にともなって上昇し, 適温は認められなかった。ここで著者らは, RuDPカルボキシラーゼ活性の温度反応を真の光合成の温度反応と定性的にはみることができるという仮定の下に, どのような影響を除去するとみかけの光合成の温度反応が, 真の光合成の温度反応に近づくかを検討した。トウモロコシ, イネでは, 600 ppm CO2, 2% O2の下でのみかけの光合成は35℃までほぼ直線的に増加した。したがって, 少くともCO2拡散抵抗, 光呼吸の影響を弱めるか, 除去するとトウモロコシ, イネの場合には, みかけの光合成の温度反応が真の光合成の温度反応に定性的には近づくことが明らかになった。しかしオオムギでは, 600 ppm CO2, 2% O2の下でのみかけの光合成は, 25℃で最大値をとり, 35℃では低下する。一方, 2% O2の下でCO2補償点を測定したところ, オオムギではトウモロコシ, イネと異なり, 25℃ から35℃にかけて急激に上昇した。2% O2の下では光呼吸は阻害され, 暗呼吸のみが行なわれていると考えられるため, 特にオオムギでは25℃以上の高温で, 明中の暗呼吸が急激に上昇することが考えられた。オオムギの600 ppm CO2, 2% O2下でのみかけの光合成は, こうした高温による明中での暗呼吸の促進により35℃で低下したと考えられる。なお, RuDPカルボキシラーゼの温度反応はイネの方がオオムギより敏感であった。したがって, イネの場合にも明中の暗呼吸の影響を何らかの方法で除去するか, あるいは定量化し, 高CO2, 低O2下のみかけの光合成に加えれば, その値はオオムギより高い温度反応を示し, RuDPカルボキシラーゼ活性の温度反応におけるイネとオオムギのちがいに対応すると考えられた。抄録全体を表示PDF形式でダウンロード (774K) -
西尾 敏彦1977 年 46 巻 4 号 p. 524-529
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーTo obtain suitable seedlings for mechanical transplanting, the effect of potash application was studied on the physical characteristics of seedlings at the 4th leaf stage. Zero to four g/box of potash (K2O) were applied as basal dressing to the seedlings grown in seedling boxes, which were filled with Kitamoto (K-deficient) and Konosu (standard) soils. 1. Physical characters of seedlings differed significantly by the difference in soils and by the amount of potash applied. Comparing with the seedlings grown in Konosu soil, those grown in Kitamoto soil were more rigid in the structure of basal part, thicker in basal section and more resistant to buckling and bending, which were due to the well developed basal part with erect and short foliage. A decrease in the rigidity in the basal part was observed as potash application was increased (Fig. 1). 2. Potash content in leaf sheath was closely related with the nature of soils and the amount of potash applied. High potash content was observed in the seedlings applied more amount of potash and this case was observed a also in the seedlings grown in Konosu soil. An increase in potash content resulted in the reduction of structural rigidity in basal part, with the increment in basal section diameter. This means that the resistance to buckling and bending decreases because of excessive foliage grown with poor developed basal part (Fig. 2). 3. So far as the information presented, no relations have been found between abundant potash application and the vigour of seedling. Therefore it is concluded that excessive potash application is not recommended because of the unfavorable physical characteristics for mechanical transplanting.抄録全体を表示PDF形式でダウンロード (702K) -
鈴木 守, 中村 公則1977 年 46 巻 4 号 p. 530-536
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリー"Maximal Growth Rate Experiment" was conducted using rice variety Hoyoku at Kyushu Agricultural Experiment Station from 1967 to 1971. The results obtained are as follows. 1. High positive correlation was observed between the amount of solar radiation and CGR during the period from 6 to 3 weeks before heading. With the increase of solar radiation CGR increased much at the early stage of the growth, but not so much at the later stage of the growth (Fig. 1). 2. Mean temperature was positively correlated with CGR at the early stage of the growth and negatively at the later stage of the growth (Fig. 2). 3. The significant positive partial correlation was found between the amount of increase in leaf area and temperature during the period from transplanting time to 6 weeks before heading, and between the amount of increase in leaf area and solar radiation during the period from 6 to 3 weeks before heading (Table 2). 4. The efficiency for solar energy utilization of whole growing duration was higher in normal season culture than in early planting culture (Table 4). 5. The efficiency for solar energy utilization after heading had a tendency to become lower as temperature became higher (Fig. 7).抄録全体を表示PDF形式でダウンロード (726K) -
川原 治之助, 松田 智明, 長南 信雄1977 年 46 巻 4 号 p. 537-542
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーIn the swelling piller-shape part of rachilla vascular bundle of rice spikelet, ramificated xylem, phloem and unlignified thick-walled parenchyma cells elabolate a mosaic structure (Fig. 1 and 2). There can be observed no transfer cell, but sieve elements are surrounded with a number of large phloem parenchyma cells including abundant mitochondria (Fig. 1, 2 and 6), and the thick-walled parenchyma cells are rich in simple pits and smooth endoplasmic reticulum (Fig. 3 and 6) connecting with cortical sclerenchyma cells (Fig. 2). For about 25 days after flowering, starch grains are observed only in the cortical sclerenchyma cells and the thick-walled parenchyma cells of rachilla bundle (Fig. 6), and subsquently disapear. By tracing barium chloride absorbed through the roots, no transpiration stream can be observed in the piller-shape part of the rachilla bundle. It is supposed, that the phloem parenchyma cells provide the sieve elements with the energy necessary for phloem active transport, that the turgor pressure of the sieve elements is controlled by putting in and out the water and solutes of sieve elements, and that the tracheids function as drainpipes of water.抄録全体を表示PDF形式でダウンロード (1667K) -
川田 信一郎, 片野 学1977 年 46 巻 4 号 p. 543-557
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーGrowth and development in the roots of rice plants were observed under the influence of water management techniques such as flooding, midseason drainage, intermittent irrigation and water percolation. Two methods were applied in this observation. One was to dot each site where crown roots and lateral roots appeared through the profiles of 10×30 cm made at depths of 10, 12.5, 15, 20, 25 and 30 cm from the soil surface after having taken a soil block by means of an improved monolith method (Figs. 3, 4 and 6). The other method was to measure the length of each crown root after cutting off vertically by a stainless steel cylinder (diameter: 150 mm) and to judge the directions of the growing crown roots by their length which were classified as either short or long. The rates of growth of the crown roots grown obliquely downwards or vertically, were higher in water-percolated field, as well as in field drained at midseason, and much lower in intermittently irrigated field than in flooded field. It has been already shown by the authors that the crown roots can be classified into the following three types according to the growing direction: all the upper primary roots of "shoot units" grew horizontally; the lower primary roots of "shoot units" grew in various directions; and most primary roots of the prophyll "shoot units" grew vertically irrespective of growth stage. It has also been shown that only the lower primary roots changed their growing direction under water mangement, i.e. all the upper primary roots grew horizontally, and most primary roots of the prophyll "shoot unit" grew obliquely downwards or vertically irrespective of water management. It was found that the crown roots grown horizontally into arable soil formed more secondary roots, with densities of 200-300 per 10 cm of crown root, than did those grown obliquely downwards or vertically into the subsoil, which formed 70-200 secondary roots per 10 cm of crown root, irrespective of water mangaement and growth stage. In the crown roots grown into the subsoil, the density of thick secondary roots, which usually branched out into tertiary roots, was much higher in the field of intermittently irrigated field as well as that drained at midseason; and higher in the percolated field than in flooded field. The formation of additional lateral roots was also shown in the following ways: tertiary roots developed in fields flooded or water percolated irrespective of the direction of crown root growth; fourth roots on the crown roots grew into the arable soil and tertiary roots on the crown roots grew into the subsoil in the field drained at midseason; fifth roots on the crown roots grew into the arable soil and fourth roots on the crown roots grew into the subsoil in intermittently irrigated field.抄録全体を表示PDF形式でダウンロード (1208K) -
武田 友四郎, 縣 和一, 箱山 晋, 田中 日吉1977 年 46 巻 4 号 p. 558-568
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーWe reported earlier that the weed vegetation of non-cultivated paddy fields, which had lain waste for years, varied with the difference of soil moisture. On the other hand, there is a well-known fact that higher plants can be divided into major two groups, C3- and C4-species, with distinct photosynthetic pathway. Recently, it is also reported that these two groups are dissimilar in their habitat affected by environmental factors such as temperature, precipitation and so on. In this investigation, in order to find out the difference of ecological distribution between C3- and C4-weeds according to soil moisture of non-cultivated paddy fields, the authors tried to compare the value of Summed Dominance Ratio (SDR2) in two weed groups of the Gramineae. The data of SDR2 used in this paper are the same ones which have been examined in the previous paper. Results are as follows: 1. The distribution of two weed groups within the Gramineae varied with the difference of soil moisture conditions in non-cultivatcd paddy fields, that is, the percentage of SDR2 in C3-weeds to total SDR2 was higher in lowland conditions than in upland ones. However, that of C4-weeds was in the reverse tendency. This relationship between ecological distribution and soil moisture condition was more apparent in paddy fields of long-year non-cultivation than in those of short-year non-cultivation. (Table 2, 3, 4) 2. It was observed that some species were distinctive in distribution pattern to soil moisture condition. Arthraxon hispidus, Hemarthria sibirica of C4-species and Panicum bisulcatum of C3-species showed a more adaptive characteristic to wide range of soil moisture condition than other specics. Echinochloa spp., Leptochloa chinensis and Paspalum distichum showed rather a well-growing characteristic under wet condition than other C4-species. And in some plots where these particular C4-species were in more invasive, SDR2 percentage of C4-species were higher than that of C3-species even under lowland condition. 3. The close relation was recognized between the ecological distribution of C3-, C4-species to soil moisture condition and their systematical situation judged from the systematics of the Gramineae which was proposed by TATEOKA. (Table 5)抄録全体を表示PDF形式でダウンロード (1024K) -
川田 信一郎, 佐々木 修, 山崎 耕宇1977 年 46 巻 4 号 p. 569-579
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーIt is known that the roots of rice plants branch out from the secondary to the sixth order lateral roots, and there are, generally, two kinds of lateral roots can be seen at any order, namely, thick and thin lateral roots. Their structures differ in that the thin lateral roots are absent in the late metaxylem elements (MX II) and in the cortex which forms lysigenous aerenchyma (Fig. 1, B and C). The vessel connection between the crown root and the secondary lateral root, between the secondary lateral root and the tertiary lateral root, and so on, are alike. In other words, the protoxylem elements (PX) of the lateral root are connected with the protoxylem elements or early metaxylem elements of the parent root, and the late metaxylem elements (MXII) of the lateral root are connected with the late metaxylem elements of the parent root, independently of the order (Figs. 3, 4 and 5). Between the vssels of the lateral root and the parent root, at the connecting region, tracheary elements (TE) were observed which may be modified forms of the stelar parenchyma cells, and these tracheary elements were jointed with the side wall with each other (Figs. 3, 4 and 5). The connection between the protoxylem elements (or the early metaxylem elements in the case of the crown roots) and the late metaxylem elements in the parent root was observed at the region where the lateral roots were formed. The connection might be undergone by modification into tracheary elements of the stelar parenchyma cells between them (Fig. 6). Some of these tracheary elements had perforations and others did not (Fig. 7).抄録全体を表示PDF形式でダウンロード (2395K) -
野瀬 昭博, 城間 理夫, 宮里 清松, 村山 盛一1977 年 46 巻 4 号 p. 580-587
発行日: 1977/12/30
公開日: 2008/02/14
ジャーナル フリーパインアップルの栽培種スムース・カイエンより選抜された, 三菱系優良系統の個体を用いて, 地上部のCO2交換に及ぼす明期の光強度の影響を調査した。測定は, 植物体に充分給水した後, 昼温30.0±1.0℃, 夜温26.5±1.0℃, 11.5時間の明期, 12.5時間の暗期の下で行なった。得られた結果は以下のとうりである。1. パインアップルの地上部のCO2交換の日変化は, 4種の光強度下において, CO2を明期に放出し, 暗期に吸収するという, CAM植物に特有なパターンを示した(第1図)。2. 明期の光強度が上昇すると, 明期におけるCO2放出速度の極大値が小さくなり, CO2吸収がより早い時刻に始まり, その後のCO2吸収速度も大きくなった(第1図)。3. したがって, 明期における光強度の上昇は, CO2収支の各パラメター; 明期のCO2放出量と吸収量, 暗期のCO2吸収量, 1日の総CO2収支を物質生産的に有利な方向へ動かした(第2表, 第3図)。4. パインアップルの地上部は, 1日の総CO2収支から見た場合に, 個体の頂部の平均光強度で30 klx以下の光強度下では, その生産性が光強度により律速されることが明らかになった(第3図)。5. 明期におけるCO2吸収は, 蒸散量の増大を伴って生じた(第4図)。6. 以上の明期の光強度とCO2交換の関係は, 暗期におけるmalateの合成, 及び明期におけるmalate-poolからのカルビン回路へのCO2の供給という, CAM植物における炭素の流れの面から考察された(第2図)。抄録全体を表示PDF形式でダウンロード (767K)
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