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The effect of light on the gibberellin metabolism and growth ofPhaseolus coccineusseedlings

✍ Scribed by Alan W. Bown; David R. Reeve; Alan Crozier

Publisher
Springer-Verlag
Year
1975
Tongue
English
Weight
534 KB
Volume
126
Category
Article
ISSN
0032-0935

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✦ Synopsis

Light inhibits the rate of stem elongation of Phaseolus coccineus L. seedlings. Gibberellin A 4 (GA4), an endogenous component of Phaseolus seedlings (Bowen et al., Phytochem. 12, 2935Phytochem. 12, -2941Phytochem. 12, , 1973) ) promotes stem growth in the light but not in darkness. Dark-grown seedlings contain larger GA pools than light-grown plants. Apically applied [aHJGA 4 is metabolised more extensively in the light. The slower rate of metabolism of [SHJGA4 in etiolated seedlings is not a consequence of isotopic dilution by the endogenous GA 4 pool or a lack of penetration of the labelled material. While it can be concluded that the capacity of seedlings to metabolise [3H]GA4 is greater in the light than in darkness, it does not necessarily follow that there is a more rapid kate of turnover of endogenous GA 4 in light-grown tissues. The results are discussed in relation to the involvement of GAs in the inhibitory effects of light on stem elongation.

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The gibberellin content and early seedli
The gibberellin content and early seedling growth of plants ofPhaseolus vulgaristreated with the growth retardant CCC
✍ J. E. Dale; G. M. Felippe πŸ“‚ Article πŸ“… 1968 πŸ› Springer-Verlag 🌐 English βš– 620 KB

1. The effect of CCC applied at 10 -2 M to plants of Phaseolus was followed. 2. Dry seeds did not contain extractable gibberellin. During germination of control plants gibberellin content increased markedly between days 3 and 4; but then tended to decline. For plants which emerged into light condit