Dear Editor, Drought is the most devastating factor limiting the pro- ductivity and geographical distribution of rice （Oryza sativa）. Several drought-tolerant varieties have been developed from drought-tolerant ger...Dear Editor, Drought is the most devastating factor limiting the pro- ductivity and geographical distribution of rice （Oryza sativa）. Several drought-tolerant varieties have been developed from drought-tolerant germplasm. These varieties make it imper- ative to clarity the mechanism of drought responses at the genomic level, which will provide a foundation for future breeding and genetic engineering efforts （Zhou et al., 2007）. Yangdao6 （YD6） was used to breed many elite varieties in China, which was developed from Yangdao2 （YD2） through a series of crosses （Supplemental Figure 1）. Here, we veri- fied that YD6 seedlings showed better drought tolerance than YD2, Yangdao4 （YD4）, and 3021 seedlings （Figure 1A）. After drought treatment for 8 d, over 81.9% of YD2 plants were rolled, which is about three times that of YD6 plants. Recovering normal growth with water, the survival rates of YD6 and YD2 seedlings were 92.2% and 65.6%, respectively.展开更多
文摘Dear Editor, Drought is the most devastating factor limiting the pro- ductivity and geographical distribution of rice （Oryza sativa）. Several drought-tolerant varieties have been developed from drought-tolerant germplasm. These varieties make it imper- ative to clarity the mechanism of drought responses at the genomic level, which will provide a foundation for future breeding and genetic engineering efforts （Zhou et al., 2007）. Yangdao6 （YD6） was used to breed many elite varieties in China, which was developed from Yangdao2 （YD2） through a series of crosses （Supplemental Figure 1）. Here, we veri- fied that YD6 seedlings showed better drought tolerance than YD2, Yangdao4 （YD4）, and 3021 seedlings （Figure 1A）. After drought treatment for 8 d, over 81.9% of YD2 plants were rolled, which is about three times that of YD6 plants. Recovering normal growth with water, the survival rates of YD6 and YD2 seedlings were 92.2% and 65.6%, respectively.
