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Gibberellins in dark grown and red light grown shoots of dwarf and tall cultivars of pisum sativum the quantification metabolism and biological activity of gibberellins in progress no. 9 and alaska



Gibberellins in dark grown and red light grown shoots of dwarf and tall cultivars of pisum sativum the quantification metabolism and biological activity of gibberellins in progress no. 9 and alaska



Planta (Heidelberg) 168(1): 119-129



The stem growth in darkness or in continuous red light of two pea cultivars, Alaska (Le Le, tall) and Progress No. 9 (le le, dwarf), was measured for 13 d. The lengths of the first three internodes in dark-grown seedlings of the two cultivars were similar, substantiating previous literature reports that Progress No. 9 has a tall phenotype in the dark. The biological activity of gibberellin A20 (GA20), which is normally inactive in le le genotypes, was compared in darkness and in red light. Alaska seedlings, regardless of growing conditions, responded to GA20. Dark-grown seedlings of Progress No. 9 also responded to GA20, although red-light-grown seedlings did not. Gibberellin A1 was active in both cultivars, in both darkness and red light. The metabolism of [13C3H]GA20 has also been studied. In dark-grown shoots of Alaska and Progress No. 9 [13C3H]GA20 is converted to [13C3H]GA1, [13C3H]GA8, [13C]GA29, its 2.alpha.-epimer, and [13C3H]GA29-catabolite. [13C3H] Gibberellin A1 was a minor product which appeared to be rapidly turned over, so that in some feeds only its metabolite, [13C3H]GA8, was detected. However results do indicate that the tall growth habit of Progress No. 9 in the dark, and its ability to respond to GA20 in the dark may be related to its capacity to 3.beta.-hydroxylate GA20 to give GA1. In red light the overall metabolism of [13C3H]GA20 was reduced in both cultivars. There is some evidence that 3.beta.-hydroxylation of [13C3H]GA20 can occur in red light-grown Alaska seedlings, but no 3.beta.-hydroxylated metabolites of [13C3H]GA20 were observed in red light-grown Progress. Thus the dwarf habit of Progress No. 9 in red light and its inability to respond to GA20 may be related, as in other dwarf genotypes, to its inability to 3.beta.-hydroxylate GA20 to GA1. However identification and quantification of native GAs in both cultivars showed that red-light-grown Progress does contain native GA1. Thus the inability of red light-grown Progress No. 9 seedlings to respond to, and to 3.beta.-hydroxylate, applied GA20 may be due to an effect of red light on uptake and compartmentation of GAs.

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Gibberellins in dark- and red-light-grown shoots of dwarf and tall cultivars of Pisum sativum: The quantification, metabolism and biological activity of gibberellins in Progress no. 9 and Alaska. Planta 168(1): 119-129, 1986

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