DISTRIBUTION OF CU2-DIAMINE OXIDASE DURING ONTOGENY OF SEEDLINGS OF VIGNA-RADIATA CULTIVARS()

Activity of Cu2+-diamine oxidase (DAO; E.C.1.4.3.6.) was measured in V igna radiata (L.) Wilczek cultivars K851, MH8320 and Pusa Baisakhi in light and in dark during ontogeny of seedlings. DAO activity was alway s the highest in cv. K851. In both light and dark grown seedlings maxi mum DAO activity was detected on day 2 after germination. Thereafter, in light grown seedlings it declined consistently upto non-detectable levels. In dark, DAO activity was higher than in light and it had the second maximum on day 7 following a similar declining pattern as obser ved for the light grown seedlings. The DAO activity was higher in a sh oot apex along with leaves than in roots and shoot axis.