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Control of flowering of orchard grass dactylis glomerata 7. influence of low temperature immediately after floral induction treatment on heading behavior



Control of flowering of orchard grass dactylis glomerata 7. influence of low temperature immediately after floral induction treatment on heading behavior



Grassland Science 28(4): 420-425



The influence of low-temperature immediately after floral-induction treatment on heading responses was investigated to establish a program of accelerating generation time in orchard grass. Seedlings of 'Nakei EV-No. 1', 'Aonami' and 'Later' were grown under continuous light in a high-temperature (25.degree. day/15.degree. C night) glasshouse for 42 days after sowing. Thereafter, they were subjected to floral-induction treatments of 9-h day-length under natural low-temperatures for autumn. The percentages of plants with heading tillers were higher under low-temperature regime as compared with control regime after the short periods of floral-induction treatments. Almost all plants reached heading regardless of temperature regimes after the long periods of treatments. Heading tillers increased as the periods of treatments became longer and still more increased under low-temperature regime. Heading began 1-2 days later in 'Aonami', 3-4 days later in 'Nakei EV-No. 1' and 'Latar' under low-temperature regime than under control regime. Under low-temperature regime, heading tillers increased promptly after the onset of heading and the periods of heading were apparently shortened in all the materials tested. There were large variations in the number of heading tillers per plant among individual plants within each material, and the variations were scarcely influenced by temperature regimes. It is possible to decrease the percentage of nonheading plants, to increase the number of heading tillers and to synchronize their flowering in orchard grass by promoting inflorescence differentiation under low-temperature immediately after a floral-induction treatment.

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