This study aims to provide a theoretical basis for screening continuous rain tolerant germplasm materials of maize tassels by studying the effects of continuous rain on the development of maize tassels. In the study, 73 maize inbred lines and 14 maize hybrid combinations were used as experimental materials to determine the characteristics related to maize tassel abortion, including tassel length, main axis length, main axis abortion length, first lateral branch length, first lateral branch abortion length, main axis abortion rate, and first lateral branch abortion rate after 6 days of continuous rain. Genetic variation and principal component clustering analysis were conducted. The results showed that under continuous rain, the tassel abortion characteristics of maize inbred lines and hybrid combinations showed rich variation. The main axis abortion rates of inbred lines and hybrid combinations were 0-100% and 18.40%-100%, respectively, with an average of 37.15% and 35.16%. The abortion rates of the first lateral branch were 0-100% and 8.59%-100%, respectively, with an average of 38.48% and 46.31%. According to the characteristics of tassel abortion, both inbred lines and hybrid combinations could be classified into three categories. The first category of inbred lines and hybrid combinations consisted of 34 and 4 materials, respectively. The tassel, main axis, and first lateral branch were longer, but the main axis abortion rate and first lateral branch abortion rate were lower, indicating a continuous rain tolerance type. There were 24 and 9 materials in the second type of inbred lines and hybrid combinations, respectively. The tassel, main axis, and first lateral branch were shorter, but the tassel main axis abortion rate and first lateral branch abortion rate were higher, indicating a continuous rain sensitive type. There were 15 inbred lines and 1 hybrid combination in type III materials, respectively, with a moderate degree of tassel abortion. 34 inbred lines and 4 hybrid combinations were selected as the continuous rain tolerant materials for tassels.
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