高温条件下における紫外線 (UV-B) の照射が幼穂形成期以降の水稲の生育に及ぼす影響

日本作物学会紀事

稲葉 健五¹ 

[1] 茨城大学教育学部

关键词: Growth chamber;    人工気象室;    High temperature;    高温;    Reproductive stage;    生殖生長期;    Rice;    水稲;    Ripening stage;    登熟;    UV-B;   

DOI  :  10.1626/jcs.74.200

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

A japonica rice (cv.Koshihikari) was used to test the effects on blooming and ripening of UV-B radiation treatment combined with high temperature treatments (day/night, 35 / 30°C). Strong UV-B radiation (60.4 kJ/m2 · day) slightly increased sterility. High temperatures and weak UV-B radiation (18.1 kJ/m2 · day) applied together from two weeks before heading and from the heading day increased sterility and those applied from two weeks after heading decreased sterility. High temperature combined with strong UV-B radiation applied from two weeks before heading increased sterility and decreased the size of unhulled grain and anther length. The same treatment given from the heading stage greatly increased sterility and decreased anther length and pollen production, and that given two weeks after heading decreased unhulled grain weight. It also decreaed photosynthetic rate in Flag leaves. A high temperature applied together with strong UV-B radiation had a synergistic effect causing poor growth; it increased the harmful effects of a high temperature and sttong UV-B given separately, on the sterility and pollen formation.

【 授权许可】

Unknown