Root Nodule Enzymes of Ammonia Assimilation in Alfalfa (Medicago sativa L.) 1: DEVELOPMENTAL PATTERNS AND RESPONSE TO APPLIED NITROGEN
AUTOR(ES)
Groat, R. Gene
RESUMO
Nitrogenase-dependent acetylene reduction activity of glasshouse-grown alfalfa (Medicago sativa L.) decreased rapidly in response both to harvesting (80% shoot removal) and applied NO3− at 40 and 80 kilograms N per hectare. Acetylene reduction activity of harvested plants grown on 0 kilogram N per hectare began to recover by day 15 as shoot regrowth became significant. In contrast, acetylene reduction activity of all plants treated with 80 kilograms NO3−-N per hectare and harvested plants treated with 40 kilograms NO3−-N per hectare remained low for the duration of the experiment. Acetylene reduction of unharvested alfalfa treated with 40 kilograms N per hectare declined to an intermediate level and appeared to recover slightly by day 15. Changes in N2-fixing capacity were accompanied by similar changes in levels of nodule soluble protein.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=425861Documentos Relacionados
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