气孔导度
导水率
木质部
蒸腾作用
化学
园艺
洪水(心理学)
植物
番茄
电导
土壤水分
农学
生物
环境科学
数学
光合作用
土壤科学
心理学
组合数学
心理治疗师
作者
Mark A. Else,W. J. Davies,M. Malone,MB Jackson
出处
期刊:Plant Physiology
[Oxford University Press]
日期:1995-11-01
卷期号:109 (3): 1017-1024
被引量:96
标识
DOI:10.1104/pp.109.3.1017
摘要
Four to 10 h of soil flooding delayed and suppressed the normal daily increase in root hydraulic conductance (Lp) in tomato (Lycopersicon esculentum Mill. cv Ailsa Craig) plants. The resulting short-term loss of synchrony between Lp and stomatal conductance decreased leaf water potential ([psi]L) relative to well-drained plants within 2 h. A decrease in [psi]L persisted for 8 h and was mirrored by decreased leaf thickness measured using linear displacement transducers. After 10 h of flooding, further closing of stomata and re-convergence of Lp in flooded and well-drained roots returned [psi]L to control values. In the second photoperiod, Lp in flooded plants exceeded that in well-drained plants in association with much increased Lp and decreased stomatal conductance. Pneumatic balancing pressure applied to roots of intact flooded plants to prevent temporary loss of [psi]L in the 1st d did not modify the patterns of stomatal closure or leaf expansion. Thus, the magnitude of the early negative hydraulic message was neither sufficient nor necessary to promote stomatal closure and inhibit leaf growth in flooded tomato plants. Chemical messages are presumed to be responsible for these early responses to soil flooding.
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