Determination and Genetic Analysis of Seedling Vigor in Field on Maize

Twelve inbred lines which collected or selected were tested in this experiment,7 inbred lines were as females and 5 inbred lines were as males.Thirty five hybridized combinations were designed with incomplete diallel crossing.Germination tendency,germination percentage,germination index and vigor index etc,4 characters were de-termined.Their combining ability and genetic parameter analyzed.The results suggested that GCA effects were signif-icant of difference in 4 characters of the same parent and among 12 parents’inbred lines of the same character.The GCA effect of K1516 was the best,and A3519 was the worse.The relationship of GCA effect and SCA effect were complex.It couldn't be done to use high GCA parents to estimate SCA effect of off-spring.Broad heritability of four characters was all more than 50 percent.Their narrowheritability was all more than 30 percent.And their additive ef-fects were wholly more than non-additive effect.These results indicated that seed vigor could be as an index while se-lected in early generation.The results also suggested that the thousand-grain weight couldn't be used to estimate seed vigor.