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Control of flowering of orchard grass dactylis glomerata 4. acquirement of responsiveness to floral induction treatment in seedlings



Control of flowering of orchard grass dactylis glomerata 4. acquirement of responsiveness to floral induction treatment in seedlings



Grassland Science 27(2): 139-146



The influence of planting density, fertility level and seedling age on the responsiveness to floral induction treatment was studied. Seedlings were grown under continuous light in a warm (25.degree. C in day/15.degree. C at night) glasshouse for several weeks after sowing. Then they were subjected to floral induction treatment of natural short day lengths and low temperatures for 2-6 wk in spring and autumn. Heading behavior was then observed under continuous light in a warm glasshouse. Seven wk old seedlings of 'Aonami' and 'Latar' grown at 4 planting densities and 2 fertility-levels were subjected to floral-induction treatment for 6 wk. Heading behavior showed that the responsiveness to floral-induction treatment substantially increased when seedlings were grown at low planting density and at high fertility-level. Seedlings of 'Aonami' and 'Nakei EV-No. 1', 3-10 wk old, were subjected to floral induction treatment. The 5-wk old seedlings grown under continuous light in a warm glasshouse were responsive to floral induction treatment. However, the effects of floral induction treatment started with the 3- or 4-wk old seedlings were lower than those started with older seedlings, although the seedling age and plant stage expressed by leaf number of main stem increased until the end of treatment. When the treatments were started at younger seedling ages, the plant height was lower until the end of treatment. The responsiveness of seedlings to floral-induction treatment was influenced not only by seedling age and leaf number but also by the size of the seedlings. Seedlings of 3-7 wk old 'Aonami', 'Latar', 'Aberystwyth S143', 'O.S.G.-7', 'Nakei EV-No. 1' and Dactylis glomerata ssp. judaica were subjected to floral induction treatment for 6 wk. The effects of floral induction treatment increased linearly with seedling age up to the 6-wk-old; the effects on the 7-wk-old seedlings were almost the same or a little higher than those on the 6-wk-old seedlings. The 6-wk-old seedlings grown under continuous light in a warm glasshouse were considerably responsive to floral induction treatment.

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