水稻子粒硒累积机制研究

Study on mechanisms of selenium accumulation in rice grains

采用溶液培养方法研究了富硒与非富硒两品种水稻(秀水48和丙9652)对硒的转运差异及其子粒硒积累机制。结果表明,水稻子粒灌浆开始后停止供硒,其根系硒浓度随着时间的推移而表现下降的趋势。秀水48根系硒含量下降幅度大于丙9652;秀水48根系中硒更加容易转运出去。剑叶是水稻的功能叶,在水稻整个生育期内剑叶中硒含量逐渐下降。秀水48剑叶硒含量下降幅度大于丙9652,两者差异显著。从硒的积累量看,秀水48剑叶硒积累量下降幅度大于丙9652,剑叶硒的转移将有助于硒在水稻子粒中的积累。

A hydroponics experiment was conducted to investigate the diversity of selenium translocation between Xiushui 48 and Bing 9652 and the mechanisms of selenium accumulation in rice （ Oryza Sativa L. ） grains. The results showed that the Se concentration in rice roots decreased after the termination of Se supply. Se decreased more in the root of Xiushui 48 than Bing 9652 and Se in the root of Xiushui 48 was also more easily transported to other parts. Flag leaf is a functional leaf of rice, and Se content decreased in the whole rice life circle. Both the decrease of Se and Se concentration in flag leaf in Xiushui 48 was higher than that of Bing 9652. The translocation of Se in flag leaf was beneficial to Se accumulation in rice grains.