Nodule and Leaf Nitrate Reductases and Nitrogen Fixation in Medicago sativa L. under Water Stress
AUTOR(ES)
Aparicio-Tejo, P.
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=426234Documentos Relacionados
- Nitrogen Fixation, Nodule Development, and Vegetative Regrowth of Alfalfa (Medicago sativa L.) following Harvest 1
- Effect of water stress on nitrogen fixation and nodule structure of common bean.
- Root Nodule Enzymes of Ammonia Assimilation in Alfalfa (Medicago sativa L.) 1: DEVELOPMENTAL PATTERNS AND RESPONSE TO APPLIED NITROGEN
- Nitrogen Reserve Mobilization during Regrowth of Medicago sativa L. (Relationships between Availability and Regrowth Yield).
- Nitrogen Fixation in an Establishing Alfalfa (Medicago sativa L.) Ley in Sweden, Estimated by Three Different Methods
