Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 69:479-482 (1982)
© 1982 American Society of Plant Biologists

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Nodule and Leaf Nitrate Reductases and Nitrogen Fixation in Medicago sativa L. under Water Stress

P. Aparicio-Tejo and Manuel Sánchez-Díaz

Departmento de Fisiología Vegetal, Universidad de Navarra, Apartado 273, Pamplona, Spain

The effect of water stress on patterns of nitrate reductase activity in the leaves and nodules and on nitrogen fixation were investigated in Medicago sativa L. plants watered 1 week before drought with or without NO3–. Nitrogen fixation was decreased by water stress and also inhibited strongly by the presence of NO3–. During drought, leaf nitrate reductase activity (NRA) decreased significantly particularly in plants watered with NO3–, while with rewatering, leaf NRA recovery was quite important especially in the NO3–-watered plants. As water stress progressed, the nodular NRA increased both in plants watered with NO3– and in those without NO3– contrary to the behavior of the leaves. Beyond –15.105 pascal, nodular NRA began to decrease in plants watered with NO3–. This phenomenon was not observed in nodules of plants given water only.

Upon rewatering, it was observed that in plants watered with NO3– the nodular NRA increased again, while in plants watered but not given NO3–, such activity began to decrease. Nitrogen fixation increased only in plants without NO3–.




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H. H. Zahran
Rhizobium-Legume Symbiosis and Nitrogen Fixation under Severe Conditions and in an Arid Climate
Microbiol. Mol. Biol. Rev., December 1, 1999; 63(4): 968 - 989.
[Abstract] [Full Text] [PDF]


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Copyright © 1982 by the American Society of Plant Biologists