Abstract:
:Root nodules were harvested from chamber-grown soybean (Glycine max L. Merrill cv Woodworth) plants throughout development. Apparent nitrogenase activity (acetylene reduction) peaked before seeds began to develop, but a significant amount of activity remained as the seeds matured. Nodule senescence was defined as the period in which residual nitrogenase activity was lost. During this time, soluble protein and leghemoglobin levels in the host cell cytosol decreased, and proteolytic activity against azocasein increased. Degradative changes were not detected in bacteroids during nodule senescence. Total soluble bacteroid protein per gram of nodule remained constant, and an increase in proteolytic activity in bacteroid extracts was not observed. These results are consistent with the view that soybean nodule bacteroids are capable of redifferentiation into free-living bacteria upon deterioration of the legume-rhizobia symbiosis.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Pfeiffer NE,Torres CM,Wagner FWdoi
10.1104/pp.71.4.797subject
Has Abstractpub_date
1983-04-01 00:00:00pages
797-802issue
4eissn
0032-0889issn
1532-2548journal_volume
71pub_type
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