Effects of Night Temperature Treatments on the Panicle initiation and the Final Leaf Number of Sorghm (Sorghum bicolor Moench) Inbred Strain 932233B.

UOZUMI Sunao, KUROKAWA Shunji, YOSHIMURA Yoshinori

doi:10.14941/grass.47.145

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夜温処理がソルガム (Sorghum bicolor Moench) 品種 932233B の幼穂形成および最終主稈葉数に及ぼす影響
ヤオンショリガソルガム Sorghum bicolor Moench ヒンシュ 932233B ノヨウスイケイセイオヨビサイシュウシュカンヨウスウニオヨボスエイキョウ

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Abstract

As part of a study on the heading characteristics of sorghum, the effects of time and duration of the night temperature treatments on the time to panicle initiation and the final leaf number were examined. Thermosensitive inbred strain 932233B were grown in pots under controlled climatic conditions both in low night temperature (LT: 15℃) and high night temperature (HT: 30℃). Plants were transferred from LT to HT or from HT to LT with several combinations of the time and duration of treatment. LT induced panicle initiation and reduced final leaf number and HT restrained panicle initiation and increased final leaf number. However, the degree of the response varied substantially among different treatments. It was suggested that the sensitivity to low temperature was acquired immediately after sowing and the sensitivity to high temperature was acquired at 3-4 leaves stage by the analysis of the above-mentioned response. The minimum LT duration required to induce the panicle differentiation (MLT) decreased with growth until 8 leaves stage, and MLT in number of emerged leaves was negatively correlated with the growth stage in leaf number at the onset of the low night temperature treatment. There were, however, no relationship between MLT and growth stage after 8 leaves stage.

Journal

Japanese Journal of Grassland Science

Japanese Journal of Grassland Science 47 (2), 145-150, 2001

Japanese Society of Grassland Science

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