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Abscisic Acid-Induced Phosphoinositide Turnover in Guard Cell Protoplasts of Vicia faba.

机译:蚕豆保卫细胞原生质体中的脱落酸诱导的磷酸肌醇转换。

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摘要

Guard cell protoplasts of Vicia faba treated with 10 [mu]M (+)abscisic acid (ABA) in the light exhibited a 20% decrease in diameter within 1.5 h, from 24.1 to 19.6 [mu]m. Within 10 s of administration of ABA, a 90% increase in levels of inositol 1,4,5-trisphosphate was observed, provided that cells were treated with Li+, an inhibitor of inositol phosphatase activity, prior to incubation. Concomitantly, levels of 32P-labeled phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol 4-phosphate decreased 20% compared to levels in control cells; levels of label in the membrane lipids phosphatidylcholine, phosphatidylethanolamine, and phosphatidylglycerol did not change significantly in response to ABA treatment. These results show that phosphoinositide turnover is activated in response to ABA in guard cells. We conclude that phosphoinositide signaling is likely to be a step in the biochemical cascade that couples ABA to guard cell shrinking and stomatal closure.
机译:在光照下用10μM(+)脱落酸(ABA)处理的蚕豆的保卫细胞原生质体在1.5小时内显示出直径降低了20%,从24.1降至19.6μm。在孵育前10秒钟内,观察到肌醇1,4,5-三磷酸酯的水平增加了90%,条件是在培养前用Li +(肌醇磷酸酶活性的抑制剂)处理细胞。同时,与对照细胞相比,32P标记的磷脂酰肌醇4,5-双磷酸酯和磷脂酰肌醇4-磷酸酯的水平降低了20%。膜脂质磷脂酰胆碱,磷脂酰乙醇胺和磷脂酰甘油中的标记水平对ABA处理无明显变化。这些结果表明,在保卫细胞中磷酸肌醇周转被激活以响应ABA。我们得出的结论是,磷酸肌醇信号传导可能是偶联ABA来保护细胞萎缩和气孔闭合的生化级联反应的一个步骤。

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