気温の違いがソルガム(Sorghum bicolor Moench)の出穂関連形質に及ぼす影響

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  • 魚住 順
    (Presen address)Natioal Agricultural Research Center for Tohoku Region
  • 吉村 義則
    National Institute of Livestock and Grassland Science
  • 黒川 俊二
    National Institute of Livestock and Grassland Science

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  • キオン ノ チガイ ガ ソルガム Sorghum bicolor Moench ノ シュッスイ カンレン ケイシツ ニ オヨボス エイキョウ

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Abstract

Sunao UOZUMI, Yoshinori YOSHIMURA and Shunji KUROKAWA (2001):Effect of Air Temperature on the Some Characters Related to Heading in Sorghum (Sorghum bicolor Moench). Grassland Science, 47, 484-490. As a part of the study concerning the heading characteristics of sorghum species, the effects of air temperature on the rate of leaf initiation and leaf emergence, the time of panicle initiation and heading and the final leaf number were examined on five cultivars with different thermosensitivity grown in pots under 15.5h day length and four levels of air temperature in glasshouse. In cultivars of high thermosensitivity, the rate of leaf initiation and the days from sowing to panicle initiation increased as temperature was raised, and these responses caused a remarkable increase in the final leaf number under the high temperature condition. Because of this increase in the leaf number, raised temperature had no hastening effect on heading although caused an increase in the rate of leaf emergence. In cultivars of low thermosensitivity, the rate of leaf initiation increased as temperature was raised, but the days to panicle initiation decreased with raised temperature. In consequence, the influence of higher temperature on the final leaf number was considerably less than that in high thermosensitive cultivars. The rate of leaf emergence of low thermosensitive cultivars was hastened with raised temperature, and this response caused a decrease in the days to heading under the high temperature condition. There were varietal differences among high thermosensitive cultivars for the response of the days to heading and among low sensitive cultivars for the response of the final leaf number although both of these differences were not so considerable as that between high sensitives and low sensitives.

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