Expression of gibberellin mutations in fruits of Pisum sativum L
1998
MacKenzie-Hose, A.K. | Ross, J.J. | Davies, N.W. | Swain, S.M.
The gibberellin (GA) economy of young pea (Pisum sativum L.) fruits was investigated using a range of mutants with altered GA biosynthesis or deactivation. The synthesis mutation lh-2 substantially reduced the content of both GA4 and GA1 in young seeds. Among the other synthesis mutations, ls-1, le-1 and le-3, the largest reduction in seed GA1 content was only 1.7-fold (le-1), while GA4 was not reduced in these mutants, and in fact accumulated in some experiments (compared with the wild type). Mutation Sln appeared to block the step GA20 to GA29 in young pods and seeds, but not as strongly as in older seeds. Mutations ls-1, le-1 and le-3 markedly reduced pod GA1 levels, but pod elongation was not affected. After feeds of [13C,3H]GA20 to leaves, the pods contained 13C,3H-labelled GA20, GA1, GA29 and GA81, and the seeds, [13C,3H]GA20 and [13C,3H]GA29. These findings are discussed in relation to recent suggestions regarding the role and origin of GA1 in pea fruits.
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