EFFECT OF ABSCISIC-ACID ON GAIN OF FEEDBACK LOOP INVOLVING CARBON-DIOXIDE AND STOMATA
EFFECT OF ABSCISIC-ACID ON GAIN OF FEEDBACK LOOP INVOLVING CARBON-DIOXIDE AND STOMATA
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DOI：
10.1104/pp.62.3.413
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发表时间：
1978-01-01
期刊：
影响因子：
7.4
通讯作者：
RASCHKE, K
中科院分区：
文献类型：
--
作者：
DUBBE, DR;FARQUHAR, GD;RASCHKE, K
以籽粒苋（Amaranthus powelli S.）离体叶片为材料，测定了细胞内CO2浓度、CO2同化和气孔的反馈环（即同化增益环[GA]和传导增益环[Gg]）的增益。瓦特，燕麦，陆地棉、苍耳Xanthium strumarium L.和玉米在不存在和存在10-5 M（±）蒸腾流中的脱落酸（阿坝）。在300 μ l/l的环境CO2浓度下进行测定。在阿坝不存在的条件下，气孔对CO2不敏感（Gg在0.00 ~-0.02之间）; sativa、G.和X. Stumarium，敏感于A. Powelli（Gg = -0.46），对Z方向的变化非常敏感。5个月（Gg = -3.6）。阿坝的加入使A. powelli（Gg = -2.0）、G.陆地棉（Gg = -0.31）和X.革兰氏阴性菌（Gg = -1.14）。气孔完全闭合的A.燕麦。在Z.在施用阿坝后，Gg降低至-0.86，但当胞间CO2浓度< 100 μ l/l时，气孔对CO2的敏感性增加。在所有情况下，施用阿坝后同化回路的增益增加，从0.0（A. Powelli）和-0.21（Z.在阿坝不存在的情况下，将A. mays）的值调节到-0.19（A. mays）和-0.19（A. mays）之间。Powelli）和-0.43（Z.在阿坝存在下，在所检测的所有物种中，阿坝都不影响叶片的光合能力。阿坝的施用导致气孔变窄，对蒸腾作用的影响大于对CO2同化作用的影响。在A. Powelli蒸腾比降低，但同化率没有随之降低。
Gains of the feedback loops involving intracellular CO2 concentration and CO2 assimilation and stomata (= assimilation loop with gain [GA] and conductance loop with gain [Gg]) were determined in detached leaves of Amaranthus powelli S. Wats., Avena sativa L., Gossypium hirsutum L., Xanthium strumarium L. and Zea mays in the absence and presence of 10-5 M (.+-.) abscisic acid (ABA) in the transpiration stream. Determinations were made for an ambient CO2 concentration of 300 .mu.l/l. In the absence of ABA, stomata were insensitive to CO2 (Gg between 0.00 and -0.02) in A. sativa, G. hirsutum and X. stumarium, sensitive in A. powelli (Gg = -0.46), and very sensitive in Z. mays (Gg = -3.6). Addition of ABA increased the absolute values of the gain of the conductance loop in A. powelli (Gg = -2.0), G. hirsutum (Gg = -0.31) and X. strumarium (Gg = -1.14). Stomata closed completely in A. sativa. In Z. mays, Gg decreased after application of ABA to a value of -0.86, but stomatal sensitivity to CO2 increased for intercellular CO2 concentrations < 100 .mu.l/l. The gain of the assimilation loop increased after application of ABA in all cases, from values between 0.0 (A. powelli) and -0.21 (Z. mays) in the absence of ABA to values between -0.19 (A. powelli) and -0.43 (Z. mays) in the presence of ABA. In none of the species examined did ABA affect the photosynthetic capacity of the leaves. The application of ABA caused stomatal narrowing which affected transpiration more than the assimilation of CO2. In the case of A. powelli the transpiration ratio decreased without a concomitant reduction of the assimilation rate.