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Control of flowering of orchard grass dactylis glomerata 8. interaction of day length and temperature for flora induction and inflorescence differentiation in dactylis glomerata ssp judaica



Control of flowering of orchard grass dactylis glomerata 8. interaction of day length and temperature for flora induction and inflorescence differentiation in dactylis glomerata ssp judaica



Grassland Science 28(4): 413-419



Short day-length and low temperature are 2 major factors which induce flower induction in orchard grass. Floral-induction did not occur under continuous light in a warm glasshouse. While floral-induction was promptly brought about under short day-length, it was accelerated by low temperature. These findings indicated that low temperature response and short day response promoted the processes of floral-induction. Floral-induction was brought about by low temperature under continuous light, though the period required for floral-induction was conspicuously longer under continuous light than under short day-length. Low temperature response may play relatively more important roles after short day response in floral-induction and inflorescence differentiation. The promotive effect of low temperature treatment on heading occurred within 5-7 days after short day treatment. There was a close relationship between the promotive effect of low temperature on heading and the degree of floral-induction attained under previous short day-length. That is, low temperature treatment immediately after short day treatment substantially promoted the heading of partially induced tillers but retarded the heading of completely induced tillers.

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