Photosynthetic activity of vegetable plants and its horticultural significance

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  • そ菜の光合成特性とその栽培的意義 (第4報)
  • 育苗中の炭酸ガス増与,空気流動がトマト,キュウリの生育,収量におよぼす影響
  • イクビョウ チュウ ノ タンサンガス ゾウヨ , クウキ リュウドウ ガ トマト , キュウリ ノ セイイク , シュウリョウ ニ オヨボス エイキョウ
  • トマト苗の光合成速度の日変化に及ぼす内,外諸要因,特に葉内の水分,澱粉含量の影響
  • トマト ナエ ノ コウゴウセイ ソクド ノ ニチヘンカ ニ オヨボス ウチ , ソト ショ ヨウイン , トクニ ハ ナイ ノ スイブン , デンプン ガンリョウ ノ エイキョウ
  • 低炭酸ガス前歴がトマト,キュウリの生理機能におよぼす影響
  • テイタンサンガス ゼンレキ ガ トマト , キュウリ ノ セイリ キノウ ニ オヨボス エイキョウ
  • 換気扇を利用した大型ビニールハウス内のトマトの生育,収量,品質
  • カンキセン オ リヨウ シタ オオガタ ビニールハウス ナイ ノ トマト ノ セイイク , シュウリョウ , ヒンシツ
  • 同化箱による光合成測定法の検討
  • ドウカバコ ニ ヨル コウゴウセイ ソクテイホウ ノ ケントウ
  • 低炭酸ガス濃度下でのトマト苗の生理機能
  • テイタンサンガス ノウド カ デ ノ トマト ナエ ノ セイリ キノウ
  • IV. Physiological aspects of low carbon dioxide experience in tomato and cucumber plants

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After-effect of low-CO2 experience upon the growth and physiology for tomato and cucumber plants was examined by means of isotopic tracers under controlled conditions.<br>The fixation of 14CO2 at normal CO2 concentration, was decreased slightly in the tomato plants which had been kept for 2 hours in an atmosphere containing 80ppm CO2. Such an after-effect of low-CO2 experience for tomato could be brought out only when the plants had been placed under conditions of low CO2 concentration and a certain degree of light intensity. On the other hand, cucumber plants had no after-effect of low-CO2 experience, although total activity of 14C fixed into the plants was clearly decreased at very low CO2 concentration.<br>A downward translocation of 14C-assimilates to the roots was restricted more significantly in cucumber than that in tomato at 80ppm CO2 in the light. A considerable restriction for translocation of assimilates from leaves into the roots was observed in cucumber plant during normal photosynthesis in the light.<br>CO2 compensation concentration which is reached in a closed system containing the plants at 20, 000 lux was 38±2ppm CO2 for tomato and 65±4ppm CO2 for cucumber. The amounts of CO2 evoluted into CO2-free air through the respiration were also higher in cucumber.<br>Tomato plants which had been kept at 80ppm CO2 for 2 hours had lower value of respiratory activity in the roots. In addition, low-CO2 experience caused a considerable decrease in the uptake of phosphorus through the tomato roots.<br>Tomato plants placed in an atmosphere containing 80ppm CO2 for 1 hour in every morning during 2 weeks resulted in the marked decrease in dry weight of root, and considerable decrease in net assimilation rate.

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