Gibberellins in the control of photoperiodic flower transition in Pharbitis nil

被引:10
作者
Kulikowska-Gulewska, H [1 ]
Majewska, M [1 ]
Kopcewicz, J [1 ]
机构
[1] Nicholas Copernicus Univ, Inst Gen & Mol Biol, Dept Plant Physiol & Morphogenesis, PL-87100 Torun, Poland
关键词
D O I
10.1034/j.1399-3054.2000.108002202.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The role of gibberellins in the photoperiodic flower induction of short-day plant Pharbitis nil has been investigated. It has been found that the endogenous content of gibberellins in the cotyledons of P. nil is low before and after a 16-h-long inductive dark period. During the inductive night the content of gibberellins is high at the beginning of darkness and about the middle of the dark period. Exogenous GA(3) when applied to the cotyledons of non-induced plants does not replace the effect of the inductive night but it can stimulate the intensity of flowering in plants cultivated on suboptimal photoperiods. GA(3) could also reverse the inhibitory effect of end-of-day far-red light irradiation on P. nil flowering. 2-Chloroethyltrimethylammonium chloride (CCC) applied to the cotyledons during the inductive night also inhibited flowering. GA(3) could reverse the inhibitory effect of CCC. The obtained results strongly suggest that gibberellins are involved in the phytochrome controlled transition of P. nil to flowering. Their effect could be additive to that of photoperiodic induction.
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页码:202 / 207
页数:6
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