Combining Ability and Correlation Analysis of Main Traits of 12 Glutinous Sorghum Parents
To screen glutinous sorghum parents with high combining ability and heritability and to improve the efficiency of glutinous sorghum selection,six restorer lines and six sterile lines of glutinous sorghum were used as materials,36 hybrid combinations were mated according to the 6x6 incomplete double-row hybrid(NC Ⅱ)experimental design.The eight primary agronomic traits(plant height,panicle length and yield,etc.)and the four primary quality traits(starch,protein,fat and tannin contents)of the hybrid combinations were examined for combining ability and heritability.The results showed that except starch and protein contents,the variance of all traits reached significant differences,and the general combining ability of quality traits such as fat and tannin was higher than that of agronomic traits.Twelve traits were jointly affected by additive and non-additive gene effects.The narrow-sense heritability of tannin,plant height,fat,protein,peduncle length of panicle and panicle length were higher and more stable,so they could be selected in the early generation;the narrow-sense heritability of the rest of the traits were relatively low,so it was preferable to select in the late generation.Fertile line 54A has higher general combining ability in traits such as yield,1000-grain weight,plant height;restorer line 21R has higher general combining ability in traits such as yield,panicle length,peduncle length of panicle;restorer line 272R has higher general combining ability in traits such as plant height,the number of primary branches.The 1609A/F235R,54A/7R and 42A/F235R were hybrid combinations with excellent performance in traits such as yield and tannin content.Correlation analysis showed that traits such as plant height,panicle length and 1000-grain weight were extremely significantly correlated with yield,but the degree of linear fit was low;peduncle length of panicle,starch,fat,the number of primary branches,protein and other traits were extremely significantly correlated with tannin content,and the peduncle length of panicle and the number of primary branches had a high degree of linear fit with tannin content.The parents such as 54A,21R and 272R have good application value in breeding practice.
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