Azospirillum spp. metabolize (17,17-2H2)gibberellin A20 to (17,17-2H2)gibberellin A1 in vivo in dy rice [Oryza sativa] mutant seedlings
2001
Cassan, F.D. (Universidad Nacional de Rio Cuarto (Argentina)) | Lucangeli, C.D. | Bottini, R. | Piccoli, P.N.
Azospirillum spp. are endophytic bacteria with beneficial effects on cereals - effects partially attributed to gibberellin production by the microorganisms. Azospirillum lipoferum and Azospirillum brasilense inoculated to rice dy mutant reversed dwarfism in seedlings incubated with [17, 17-2H2]GA20 with formation of [17, 17-2H2]GA1, showing the in vivo capacity to perform the 3beta-hydroxylation. When Prohexadione-Ca, an inhibitor of late steps in gibberellin biosynthesis, was added to the culture medium, no complementation was observed and no [17, 17-2H2]GA1 was produced. The latter suggests that the bacterial operating enzyme may be a 2-oxoglutarate-dependent dioxygenase, similar to those of plants.
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