Studies on the Seed Production of Tropical Grasses : VI. The effects of temperature on the development of inflorescence, heading and seed yield in Green panic and Kazungula setaria

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  • 暖地型イネ科牧草の採種に関する研究 : VI.グリーンパニックとカズングラセタリアの幼穂の発育・出穂および種子収量に及ぼす温度の影響
  • 暖地型イネ科牧草の採種に関する研究-6-グリーンパニックとカズングラセタリアの幼穂の発育・出穂および種子収量に及ぼす温度の影響
  • ダンチガタ イネカ ボクソウ ノ サイシュ ニカンスルケンキュウ 6 グリーン

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Abstract

In order to make clear the effect of temperature on the development of inflorescence, heading and seed yield in Green panic (Panicum maximum var. trichoglume) and Kazungula setaria (Setaria anceps STAPF cv. Kazungula) an experiment was conducted in a phytotron under three constant temperature regimes of 20℃, 25℃ and 30℃ through day and night. The results were as follows: 1) In Green panic, the stage of inflorescence development was more advanced at 25℃ than other two temperature regimes and when the inflorescence development of main stem reached to ripening stage, the deviations among the investigated tillers showed a narrow range. While in Kazungula setaria, the stage of the inflorescence development reached almost to the same stage under each temperature conditions, but the diviations among the investigated tillers showed wider range at 30℃ than other two temperature regimes. 2) Total numbers of heading tillers of those two species were maximal at 25℃, being following by 20℃ and 30℃. 3) The seed weight per head of those two species was highest at 25℃, but was lowest at 30℃ in Green panic and 20℃ in Kazungula setaria resulting about the half of seed weight at 25℃. These results show that the development of inflorescence, heading and seed yield in those two species were most effective at 25℃. In Green panic, however, it was recognized that under the high temperature (30℃) the development of inflorescence was delayed, head size was smaller, and filled seeds and seed weight per head were extremely decreased. While in Kazungula setaria, it was recognized that the development of inflorescence was not affected by temperature conditions, but the head size was largest under the low temperature condition (20℃).

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