%A TAO Long-Xin, FU Guan-Fu, SONG Jian, XIONG Jie, LE Ming-Kai, WANG Xi %T Fertility Responses to Drought Injury at Booting Stage of Rice Maintainers and Remedy Effects of Water Complement %0 Journal Article %D 2010 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2010.01568 %P 1568-1577 %V 36 %N 09 %U {https://zwxb.chinacrops.org/CN/abstract/article_4617.shtml} %8 2010-09-12 %X Drought tolerance traits of 14 widely used Chinese rice maintainers were evaluated at booting stage by using both soil moisture meter and drying soil methods. According to drought stress index, the maintainers were classified as four classes, i.e. drought-insensitive, drought-resistant, drought-friability and drought-sensitive. Typical drought-insensitive maintainers K22-B, Jin 23-B and typical drought-sensitive maintainers Zhenshan 97-B, Zhong9-B were selected to suffer drought treatments. The results indicated that secondary panicles were more sensitive than primary panicles, and inferior grains were more sensitive than superior grains to drought stress in both drought-insensitive and drought-sensitive maintainers. These drought-tolerant varieties showed an apical dominance in rice panicles. Drought tolerances at three growth stages corresponding to pollen-mother-cell-meiosis, pollen-forming and pollen-filling stages were also compared, showing that pollen-filling stage was most sensitive to drought stress while pollen-mother-cell-meiosis stage was most insensitive to drought stress. Drought-injury at booting stage was ameliorated obviously with water supplement remedy, especially in the inferior grains of drought-insensitive maintainers. Percentage of partially filled grains other than that of abortive grains decreased obviously. It indicates that drought-caused abortion to rice grains is irreversible.