水分关系和 flacca 番茄突变体生长与脱落酸的关系。
Water Relations and Growth of the flacca Tomato Mutant in Relation to Abscisic Acid.
机构信息
Department of Environmental Biology, Research School of Biological Sciences, Australian National University, Canberra City, A.C.T. 2601, Australia.
出版信息
Plant Physiol. 1983 May;72(1):251-5. doi: 10.1104/pp.72.1.251.
Abstract
The flacca mutant in tomato (Lycopersicon esculentum Mill. cv Rheinlands Ruhm) was employed to examine the effects of a relatively constant diurnal water stress on leaf growth and water relations. As the mutant is deficient in abscisic acid (ABA) and can be phenotypically reverted to the wild type by applications of the growth substance, inferences can be made concerning the involvement of ABA in responses to water stress. Water potential and turgor were lower in leaves of flacca than of Rheinlands Ruhm, and were increased by ABA treatment. ABA decreased transpiration rates by causing stomatal closure and also increased the hydraulic conductance of the sprayed plants. Osmotic adjustment did not occur in flacca plants despite the daily leaf water deficits. Stem elongation was inhibited by ABA, but leaf growth was promoted. It is concluded that, in some cases, ABA may promote leaf growth via its effect on leaf water balance.
摘要
flacca 突变体番茄（Lycopersicon esculentum Mill. cv Rheinlands Ruhm）被用来研究相对恒定的昼间水分胁迫对叶片生长和水分关系的影响。由于突变体缺乏脱落酸（ABA），并且可以通过应用生长物质表型回复为野生型，因此可以推断 ABA 参与了对水分胁迫的响应。flacca 叶片的水势和膨压低于 Rheinlands Ruhm，ABA 处理可增加水势和膨压。ABA 通过关闭气孔降低蒸腾速率，同时增加喷雾植物的水力传导率。尽管 flacca 植物每天都有叶片水分亏缺，但没有发生渗透调节。ABA 抑制茎伸长，但促进叶片生长。因此可以得出结论，在某些情况下，ABA 可能通过其对叶片水分平衡的影响促进叶片生长。
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