Associative symbiosis of Azospirillum lipoferum with dicotyledonous succulent plants of the Indian desert

Publisher Website
Google Scholar
Abstract
The roots of several dicotyledonous xerophytic plants exhibited nitrogenase activity. A. lipoferum was isolated from the roots of these plants including several species of Opuntia having crassulacean acid metabolism. These isolates showed high rates of acetylene reduction; maximum nitrogenase activity was observed with the isolate from Opuntia vulgaris. Organic acids rather than sugars were preferred as C source for 2 selected isolates studied. However, no activity was detected with formic, oxalic, or lactic acid. Inorganic N sources caused significant reduction in nitrogenase activity, while organic sources such as amino acids and proteins either stimulated or did not significantly inhibit the activity. However, urea completely inhibited formation of nitrogenase activity. Growth measured as optical density was enhanced with all the N sources except KNO2.

This publication has 0 references indexed in Scilit: