Stomatal Responses to Water Deficits and Abscisic Acid in Leaves of Sunflower Plants (Helianthus annuus L.) Grown under Different Conditions : ENVIRONMENTAL AND STRESS RESPONSES
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概要
- 論文の詳細を見る
The decrease in diffusive conductance of a leaf exposed to water stress or to exogenous abscisic acid (ABA) was smaller in leaves of sunflower plants (Helianthus annuus L. cv. NK285) that had been grown in a phytotron in humid air than in leaves of sunflowers grown outdoors. Stomata of the phytotron-grown plants were slower to close after detachment of a leaf than those of the outdoor plants. When stomata closed rapidly, as they did in detached leaves and after treatment with ABA, the extent of closure was varied over the leaf's surface, in particular in the case of phylotron-grown plants, and the extent of the heterogeneity was greater in the phytotron-grown plants than in the outdoor plants. When stomata closed gradually, for example, under conditions of limited moisture in the soil, closure occurred uniformly over leaves of plants of both types. The smaller decrease in diffusive conductance of leaves from phytotron-grown plants after treatment with ABA resulted from the presence of patches on the surface in which stomata remained open. The smaller decrease of diffusive conductance in the phytotron-grown plants under conditions of limited moisture in the soil resulted from the uniformly lower responsiveness of stomata on a leaf to the decrease in water potential. When estimates are made of the intercellular concentration of CO_2 (Ci) from gas-exchange measurements, heterogeneity in stomatal closure should be monitored when stomata close rapidly, in particular in plants grown in humid air, be-cause heterogeneous stomatal closure can lead to overestimates of Ci.
- 日本植物生理学会の論文
著者
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Ishihara Kuni
Faculty Of Agriculture Tokyo University Of Agriculture And Technology:faculty Of International Agric
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Ishihara Kuni
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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Hirasawa Tadashi
Tokyo Univ. Agric. & Tech.
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Hirasawa Tadashi
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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Wakabayashi Katsuhiro
Faculty of Agriculture, Tokyo University of Agriculture and Technology
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Touya Shigemi
Faculty of Agriculture, Tokyo University of Agriculture and Technology
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Touya Shigemi
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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Wakabayashi Katsuhiro
Faculty Of Agriculture Tokyo University Of Agriculture And Technology
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