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Control of flowering of orchard grass dactylis glomerata 5. increase in responsiveness to floral induction treatment with plant age after juvenile stage



Control of flowering of orchard grass dactylis glomerata 5. increase in responsiveness to floral induction treatment with plant age after juvenile stage



Grassland Science 27(2): 147-151



Seven-week old seedlings and aged tillers were used. The seedlings were grown under continuous light in a warm (25.degree. C in day/15.degree. C at night) glasshouse. Aged tillers were obtained by dividing clonal materials which had been grown under the same condition for .apprx. 6 mo. These materials of each age were subjected to floral induction treatments for 2-6 wk. Heading behavior was observed under continuous light in a warm glasshouse. In experiment I, seedlings and aged tillers of 'Aonami' were subjected to natural short day lengths and low temperatures for 2, 3, 4 and 5 wk. The number of weeks required for floral induction was considerably shorter in aged tillers than in 7-wk-old seedlings. In experiment II, seedlings of 'Aonami' 'Aberystwyth S143' and 'Nakei EV-No. 1' were subjected to continuous light with 2 temperatures (natural low temperature and controlled warm temperature) for 6 wk. Floral induction was almost entirely prevented by continuous light independently of temperature conditions. In experiment III, aged tillers of 'Aonami', Aberystwyth S143' and EV-700' were subjected of continuous light with the 2 temperatures as in Experiment II for 6 wk. Floral induction scarcely occurred under both conditions of continuous light and warm temperature but was brought about only by low temperature even under continuous light in aged tillers. The responsiveness of orchardgrass to short day length and low temperature increased with plant age after the juvenile stage. The short day requirement became lower in the aged plants than in the seedlings immediately after juvenile stage.

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