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Annals of Botany 81: 609-617, 1998
© 1998 Annals of Botany Company

Effects of Interactions Between Low and High Temperature Treatments on Flowering of Spring Rape (Brassica napusvar.annua)

S. R. DAHANAYAKE and N. W. GALWEY

Department of Plant Sciences, Faculty of Agriculture, The University of Western Australia, Nedlands, W.A., 6907, Australia

Received: November 7, 1997 ; Returned for revision: December 10, 1997 . Accepted: January 26, 1998 .

Exposure to high temperature (30 °C) before or after exposure to low temperature (0, 4 or 8 weeks at 4 °C) consistently increased the number of leaf nodes at flowering and delayed flowering in a range of genotypes of spring rape(Brassica napusvar.annuaL.). Four days of prior exposure to high temperature had more effect than 2 d, and the effect of subsequent exposure to high temperature was maximized when exposure commenced 1 week after the end of the low-temperature treatment. In genotypes that showed a vernalization response (i.e. in which the number of leaf nodes at flowering was reduced or flowering was advanced by low temperature), this response was reduced or eliminated by either prior high-temperature treatment (antivernalization) or subsequent high-temperature treatment (devernalization). A biochemical model to account for these effects is proposed.Copyright 1998 Annals of Botany Company

Brassica napusvar.annua, spring rape, antivernalization, devernalization, vernalization


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