The Effect of Shading at Different Growing Stage on the Spike Number and the Character of Spike in Wheat Plants

[摘要] The effect of shading at different growing stage on wheat was examined to confirm the stage when the spike number and the character of spike were determined. Spike number decreased by shading to full heading date. T3 showed a marked decrease in the spike number compared with M, T1 or T2. Spikelet number decreased to floret differentiation stage of tillers by shading. Since floret differentiation stage was delayed in T3 than in comparison with that in M, T1 or T2, spikelet number of T3 decreased later than M, T1 or T2 by shading. Sterile spikelet number of tillers decreased to full heading date by shading. Grain number per spikelet of tillers was affected by shading from two weeks before full heading to ripening stage. Grain weight of tillers was affected by shading at ripening stage.

[学科分类] 农业科学（综合）

[关键词] Fertile spikelet number;穎花分化;Floret differentiation;遮光処理;Grain number per spikelet;小穂あたり粒数;Grain weight;小穂数;Shading treatment;千粒重;Spikelet number;稔実小穂数;Sterile spikelet number;不稔実小穂数;Tiller.;分げつ.