Involvement of Calcium in the Photoperiodic Flower Induction Process of Pharbitis nil
Open Access
- 1 February 1989
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 89 (2) , 530-534
- https://doi.org/10.1104/pp.89.2.530
Abstract
EGTA, a specific Ca2+ chelator, inhibited the flowering response of Pharbitis nil when applied to the cotyledons immediately before the inductive dark period. Calcium sprayed 30 minutes after the EGTA blocked the effect of EGTA. The length of the critical dark period was increased both by EGTA and by LaCl3. The calmodulin antagonists W-7 and chlorpromazine also reduced the flowering response. On the other hand, A23187, a calcium ionophore, increased the flowering response. Both EGTA and A23187 were effective at certain times of the photoperiod but had almost no effect when applied at other times. The results indicate that the level of endogenous Ca2+ may be limiting for floral induction in Ph. nil. Ca2+ seems to play a role during the early stages of the inductive dark period.This publication has 14 references indexed in Scilit:
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