Studies on the Seed Production of Tropical Grasses : V. Development of the inflorescence on the tillers developed at different times 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 : V.グリーンパニックとカズングラセタリアの出現時期別分げつ群の幼穂発育経過
  • 暖地型イネ科牧草の採種に関する研究-5-グリーンパニックとカズングラセタリアの出現時期別分げつ群の幼穂発育経過
  • 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 5 グリーン

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Abstract

In order to make clear the processes of seed production of Green panic (Panicum maximum var. trichoglume) and Kazungula setaria (Setaria anceps Stapf cv. Kazungula), the differentiation stages of inflorescence and floret, processes of heading on the tillers developed at different times were investigated. The results are summarized as follows: 1) The times of the inflorescence differentiation were differed when the seeds of those both species were sown on the same date. The differentiation stages of the inflorescence on the tillers which headed at the peak of heading (in Green panic, tillers developed during the period before nine leaf stage of the main stem, and in Kazungula setaria, before fifteen leaf stage of the main stem) were ten leaf stage of the main stem in Green panic and fifteen leaf stage of the main stem in Kazungula setaria, but the differentiation stages of the floret were expanding stage of flag leaf of the main stem in both species. 2) When the main stem of those both species reached to the ripening stage, in Green panic, the most of the individual tillers which headed at the peak of heading showed a narrow range in deviations of the stage of inflorescence development and almost reached to flowering stage. In Kazungula setaria, however, those showed wide range in deviations of the stage of inflorescence development. Therefore, in the latter, the stage of inflorescence development on the individual tillers which headed at the peak of heading and on the individual tillers developed later than the tillers which headed at the peak of heading was overlapped. 3) From these results, the most important stage for the seed production was from ten leaf stage till expanding stage of flag leaf of the main stem in Green panic and from fifteen leaf stage till expanding stage of flag leaf of the main stem in Kazungula setaria. The period of those two stages was about twelve days in the former and about fifteen days in the latter.

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