Are Endogenous Gibberellin-like Substances involved in Floral Induction

THE concentration of endogenous gibberellin-like substances has been reported to increase in cold-requiring plants during exposure to a low temperature 1–3 . Synthesis of gibberellin is also known to be blocked by certain growth retardants, some of which inhibit flowering 3–6 . Thus there is increas...

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Bibliographic Details
Published in:Nature (London) 1970-10, Vol.228 (5266), p.82-83
Main Authors: FONTES, M. R., OZBUN, J. L., POWELL, L. E.
Format: Article
Language:English
Subjects:
Humanities and Social Sciences
letter
multidisciplinary
Science
Science (multidisciplinary)
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Summary:THE concentration of endogenous gibberellin-like substances has been reported to increase in cold-requiring plants during exposure to a low temperature 1–3 . Synthesis of gibberellin is also known to be blocked by certain growth retardants, some of which inhibit flowering 3–6 . Thus there is increasing evidence for an involvement of gibberellin in floral induction. In studies with broccoli ( Brassica oleracea variety italica ), it was found that low temperature enhanced flowering and that (2-chloroethyl)trimethylammonium chloride (CCC) did not retard floral induction, but that 1,1-dimethylaminosuccinamic acid (B995) did 7,8 . Although both these compounds are considered to be growth retardants, B995 has not been shown to affect the endogenous concentration of gibberellin. It was therefore important to determine the effects of CCC and B995 on this concentration in broccoli in relation to floral induction.
ISSN:0028-0836
1476-4687
DOI:10.1038/228082a0