STOMATAL OPENING IN ISOLATED EPIDERMAL STRIPS OF VICIA FABA .2. RESPONSES TO KCL CONCENTRATION AND ROLE OF POTASSIUM ABSORPTION
STOMATAL OPENING IN ISOLATED EPIDERMAL STRIPS OF VICIA FABA .2. RESPONSES TO KCL CONCENTRATION AND ROLE OF POTASSIUM ABSORPTION
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DOI：
10.1104/pp.43.12.1953
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发表时间：
1968-01-01
期刊：
影响因子：
7.4
通讯作者：
HSIAO, TC
中科院分区：
文献类型：
--
作者：
FISCHER, RA;HSIAO, TC
本文研究了KCl对蚕豆离体表皮条气孔开放的刺激作用。在黑暗+正常空气中，开放响应在100 mmKCl时最大，而在光+无CO2空气中，在约10 mmKCl时最大。无CO2的空气比光更有影响力，在减少KCl浓度所需的最大开放。用~（86）Rb ~+示踪K ~+的结果表明，不同条件下气孔开度的增加与K ~+吸收量密切相关。估计量的K+采取的保卫细胞，沿着与抗衡离子，是足以占溶质电位的变化与开放。这表明，K+等胞外溶质的吸收可能是气孔开放的主要机制。光+无CO2空气刺激气孔开放和K+吸收，气孔开度的增加与保卫细胞中淀粉含量的减少密切相关。这表明，这是一个次要的变化，虽然可能密切相关的K+吸收。
The stimulation by KCl of stomatal opening in isolated epidermal strips ofVicia fabawas examined. In dark + normal air the opening response was maximal at 100 mmKCl while in light + CO2-free air it was maximal at about 10 mmKCl. CO2-free air was more influential than light in reducing the KCl concentration required for maximal opening. K+was essential while Cl−seemed to be of secondary importance in these processes.The use of86Rb+as a tracer for K+showed that the increase in stomatal aperture under various conditions was well correlated with K+uptake. The estimated amount of K+taken up by guard cells, along with a counter ion, was sufficient to account for the changes in solute potential associated with opening. It is suggested that the absorption of extracellular solutes, such as K+, may be the primary mechanism of stomatal opening. Both opening and K+absorption are stimulated by light + CO2-free air.The increase in stomatal aperture was also well correlated with the decrease in stainable starch in guard cells under all conditions. It is suggested that this is a secondary change, although perhaps closely linked to K+absorption.