Stomatal closure in flooded tomato plants involves abscisic acid and a chemically unidentified anti-transpirant in xylem sap
Stomatal closure in flooded tomato plants involves abscisic acid and a chemically unidentified anti-transpirant in xylem sap
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DOI：
10.1104/pp.112.1.239
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发表时间：
1996-09-01
期刊：
影响因子：
7.4
通讯作者：
Jackson, MB
中科院分区：
文献类型：
--
作者：
Else, MA;Tiekstra, AE;Jackson, MB
我们解决了土壤淹水如何关闭番茄(番茄)气孔的问题。Cv Ailsa Craig)在没有叶片水分亏缺的情况下在几个小时内种植植物。对三种假说进行了检验，即(A)淹水增加了根木质部汁液中脱落酸(ABA)的输出，(B)淹水增加了ABA的合成和从老叶到幼叶的输出，以及(C)淹水减少了ABA在叶片中的积累。假设a被拒绝，因为从木质部汁液中淹水的根分泌的ABA减少。假设b被拒绝，因为老叶既不提供ABA，也不影响幼叶的气孔。叶柄热环剥通过减少[C-14]蔗糖的输出，增加体积ABA，关闭气孔而不缺水，从而抑制韧皮部输出和模拟淹水。然而，在淹水植株中，散叶ABA直到气孔开始关闭后才增加。后来，ABA下降，尽管气孔仍然关闭。水淹番茄根部木质部汁液中含有一种促进气孔关闭的未知因子，但不是ABA。这可能是一个根来源的积极信息，关闭了被淹的番茄植株的气孔。
We address the question of how soil flooding closes stomata of tomato (Lycopersicon esculentum Mill. cv Ailsa Craig) plants within a few hours in the absence of leaf water deficits. Three hypotheses to explain this were tested, namely that (a) flooding increases abscisic acid (ABA) export in xylem sap from roots, (b) flooding increases ABA synthesis and export from older to younger leaves, and (c) flooding promotes accumulation of ABA within foliage because of reduced export. Hypothesis a was rejected because delivery of ABA from flooded roots in xylem sap decreased. Hypothesis b was rejected because older leaves neither supplied younger leaves with ABA nor influenced their stomata. Limited support was obtained for hypothesis c. Heat girdling of petioles inhibited phloem export and mimicked flooding by decreasing export of [C-14]sucrose, increasing bulk ABA, and closing stomata without leaf water deficits. However, in flooded plants bulk leaf ABA did not increase until after stomata began to close. Later, ABA declined, even though stomata remained closed. Commelina communis L. epidermal strip bioassays showed that xylem sap from roots of flooded tomato plants contained an unknown factor that promoted stomatal closure, but it was not ABA. This may be a root-sourced positive message that closes stomata in flooded tomato plants.