相対的根量および根の生理的活性は花粉数を介してイネの穂ばらみ期耐冷性に影響する

日本作物学会紀事

国分 牧衛²  中村 貞二²  張 祖建¹  西山 岩男² 

[1] 中国揚州大学農学院;東北大学大学院農学研究科

关键词: Rice;    イネ;    Pollen;    花粉;    Number of Pollen Grains;    花粉数;    Cool-weather resistance;    耐冷性;    Nitrogen;    窒素;    Root;    æ ¹;    Booting stage;    穂ばらみ期;    Cool-weather damage;    冷害;   

DOI  :  10.1626/jcs.77.498

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The relative amount of roots (dry weight ratio of root to shoot, or root dry weight per spikelet) or the physiological activity of roots is correlated with the cool-weather resistance in rice plants. The objective of this study is to elucidate the effects of the relative amount or physiological activity of roots on the number of pollen grains (NPG) which are generally considered to be closely related with the cool-weather resistance. NPG in the anthers excised from the spikelets just before flowering, was counted using the same plant materials as described in our previous reports. NPG was lower at the higher levels of nitrogen application in both the control and cooled plants. The fertility of the cooled plants tended to decrease with decreasing NPG. NPG tended to decrease with decreasing relative amount of roots, which had already been shown to decrease with increasing nitrogen level. Moreover, NPG was decreased in both the cooled and control plants by root cutting or treatment of roots with a respiratory inhibitor, and was positively correlated with the fertility. These results strongly suggest that the development and activity of roots affect the cool-weather resistance through pollen formation, and that one of the reasons why the cool-weather resistance is decreased by the higher levels of nitrogen application is the decrease of NPG due to the lowering of the relative amount of roots.

【 授权许可】

Unknown