Seed harvesting of green panic [Panicum maximum Jacq. var. trichoglume Eyles], 3: Effects of temperature and daylength on heading
1990
Okada, T. (National Grassland Research Inst., Nishinasuno, Tochigi (Japan))
Number of days from emergence to heading of green panic was 44 at 27 degrees C, and the number increased at temperatures higher or lower than 27 degrees C. At higher temperatures not exceeding 30 degrees C a larger number of ears was produced. At 35 degrees C compared to 30 degrees C, and at a low light intensity, heading was delayed and ear number was markedly reduced. As growth progressed, in particular at the latter growth stage, the rate of development increased with the increase of the temperature. At a daily mean temperature of 22 degrees C, heading occurred earlier after emergence at a constant temperature than at alternating temperatures. Under daylength between 12 and 16 hours heading occurred earlier when the daylength was shorter. It was assumed that heading began on about the same day for all daylengths of 16-24 hours. When the plants were transferred from a long-day regime to a daylength of 12 hours before the 7 leaf stage, the number of days required from emergence to heading and the number of leaves and elongated internodes slightly differed from those under a continuous daylength of 12 hours. When the transfer took place after the 8 leaf stage, heading was delayed and more leaves were produced
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