Effects of Night Temperature Treatments on the Panicle Initiation and Final Leaf Number of Some Sorghum (sorghum bicolor Moench) Varieties.

UOZUMI Sunao, YOSHIMURA Yoshinori, KUROKAWA Shunji

doi:10.14941/grass.47.139

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夜温処理が数種ソルガム(Sorghum bicolor Moench) 品種の幼穂形成および最終主稈葉数に及ぼす影響
ヤオンショリガスウシュソルガム Sorghum bicolor Moench ヒンシュ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

To clarify the heading behavior of the thermo-sensitive sorghum varieties, effects of the timing and duration of the night temperature treatments on the panicle initiation and the final leaf number were examined. Two hybrid cultivars (FS403 and GROWERES30F) and one inbred (932233B) strain were grown in pots under controlled climatic conditions both in low night temperature (LT:15℃) and high night temperature (HT: 30℃). Plants were tramsferred from LT to HT or from HT to LT with several combinations of the timing and duration of temperature treatments. LT induced panicle initiation and reduced final leaf number and HT restrained panicle initiationand increased final leaf number in all varieties. The time when plants first became sensitive to low night temperature was earlier in 932233B than in FS403 and GROWERES30F. The minimum LT duration requiredto induce the panicle initiation (MDPI) was the shortest in 932233B and the longest in GROWERES30F. MDPI was, however, decreased with growth progress in all varieties. The time when plants first became sensitive to high night temperature was the earliest in 932233B and the latest in GROWERES30F.

Journal

Japanese Journal of Grassland Science

Japanese Journal of Grassland Science 47 (2), 139-144, 2001

Japanese Society of Grassland Science

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