1986
DOI: 10.1007/bf00392370
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Abstract: The metabolism and growth-promoting activity of gibberellin A20 (GA20) were compared in the internode-length genotypes of pea, na le and na Le. Gibberellin A29 and GA29-catabolite were the major metabolites of GA20 in the genotype na le. However, low levels of GA1, GA8 and GA8-catabolite were also identified as metabolites in this genotype, confirming that the le allele is a 'leaky' mutation. Gibberellin A20 was approximately 20 to 30 times as active in promoting internode growth of genotype na Le as of genoty… Show more

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Cited by 104 publications
(65 citation statements)
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“…Lightgrown shoots of the wild type converted GA203 to GA,, whereas the conversion of GA20 to GA1 was greatly reduced in shoots of the dwarf le genotype. Wild-type seedlings responded as well to GA20 as to GA1, whereas in dwarf le seedlings the response to GA20 was much less than that to GA1 (5,7). It was concluded from this work that the activity of GA20 in light-grown stems is due to its conversion to GA,.…”
mentioning
confidence: 61%
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“…Lightgrown shoots of the wild type converted GA203 to GA,, whereas the conversion of GA20 to GA1 was greatly reduced in shoots of the dwarf le genotype. Wild-type seedlings responded as well to GA20 as to GA1, whereas in dwarf le seedlings the response to GA20 was much less than that to GA1 (5,7). It was concluded from this work that the activity of GA20 in light-grown stems is due to its conversion to GA,.…”
mentioning
confidence: 61%
“…The le mutation, which reduces the 3,-hydroxylation of GA20 to GA1, is known to be leaky ( 5). Further studies are in progress to determine whether a difference in sensitivity of dark-grown tissues to GA, as suggested by Reid (15) is indeed sufficient to explain the enhanced activity of GA20 in the dark, or whether increased metabolism of GA20 to GA, occurs in the dark.…”
Section: Plantmentioning
confidence: 95%
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“…However, the GA 1 levels were only reduced to approximately 50% in young lh-1 seeds (Swain et al, 1993) with a full-length putative protein containing only a single-base substitution. A loglinear relationship exists between endogenous GA 1 levels and internode elongation in pea shoots (Ingram et al, 1986;Ross et al, 1989), and if a similar relationship is present in seeds, then a 90% reduction in GA 1 levels may cause a large and observable phenotype, whereas 50% reduction produces only a transient effect.…”
Section: Sensitivity To Paclobutrazolmentioning
confidence: 95%