Abstract��Abstract: Although the areas of direct seeding of rice increase year by year, the rice yield is still not stable. The main reason is that the intolerance of rice seeds to waterlogging leads to low seedling growth of direct seeded rice. In this study, 445 rice seeds were used as materials to compare their waterlogging tolerance traits at germination and seedling stages through both field waterlogging and deep-water waterlogging with measuring cylinder, so as to screen the waterlogging-tolerant rice varieties. The results showed that the wa-terlogging tolerance traits of different rice seeds were significantly different under field waterlogging treatment. According to the relative seedling rates, they can be divided into four types: waterlogging-tolerant, relatively waterlogging-tolerant, relatively sensitive and extremely sensitive. There were 21 waterlogging-tolerant ma-terials with greater than 50.00% relative seedling rates (such as Kang116, 4249H, D204 and WJGA26), and 172 relatively waterlogging-tolerant materials with 30.01%~50.00% relative seedling rates (such as You6-4, WJGD30, D156 and KangBai-7). There were 185 relatively waterlogging-sensitive materials (HanYan111, NY5, Huang8-26, 12-2) with 10.00%~30.00% relative seedling rates, and 77 extremely waterlogging-sen-sitive materials (Yue51, W56, 18Yue368, Yue-62) with less than 10.00% relative seedling rates. Two pheno-types of rice were found under the simulated deep-water waterlogging conditions. One was the waterlogging-tolerant type with normally growing roots and leaves, and the other was the waterlogging-sensitive type with extreme extension of coleoptile and complete inhibition of roots and leaves. Through these experiments, rice resources with high seedling rates under waterlogging conditions were screened out. Further research and ap-plication of these resources will be needed to promote the direct seeding technology of flooded rice, which can not only improve the stability of seedling rate and yield of direct seeded rice, but also avoid or reduce herbicide application.
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CHEN Yi, PENG Gui-yan, WU Yan, WANG Si-yao, ZHAO Wan-ling, LIU Ming, CHEN Hui-ling, CHEN Liang-bi. Studies on Submergence Tolerance of Rice Seeds. Life Science Research, 2021, 25(5): 417-424.
