Water Relations of Cotton Plants under Nitrogen Deficiency
Year: 1981
Type: article
Abstract: Nitrogen nutrition exerted a strong effect on stomatal sensitivity to water stress in cotton. In well-watered plants grown with 0.31 millimolar N in the nutrient solution, stomata closed at a water potential of -9 bars even though the wilting point was below -15 bars. For each doubling of nutrient N level, the water potential for stomatal closure decreased by about 2 bars. Elevated intercellular CO(2) concentrations caused only slight stomatal closure regardless of N nutrition. Exogenous abscisic acid (ABA) greatly increased stomatal sensitivity to elevated CO(2) concentrations.PLANTS SUBJECTED TO WATER STRESS GAVE THE FOLLOWING RESPONSES: (a) decreased stomatal conductance at ambient external CO(2) concentration; (b) increased stomatal sensitivity to elevated CO(2) concentrations; (c) decreased mesophyll conductance to CO(2); and (d) increased endogenous ABA content. All of these responses to stress occurred at a higher water potential in N-deficient plants than in normal plants. The results show that N nutrition and water stress interact to control ABA accumulation and the events regulated by that accumulation.
Source: PLANT PHYSIOLOGY
DOI: 10.1104/pp.67.1.115
Authors: John W. Radin, Robert C. Ackerson
Institution: United States Department of Agriculture
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2090629016