Study on Combining Ability and Hereditary Parameter of Tassel Characters in Maize

By using diallel crossing of Griffing method 4,7 maize inbred lines which were different in tassel characters,were evaluated for main axis length,branch number,mean length of branch,spikelet density,spikelet density per tassel as well as normal combining ability,special combing ability and corresponding genetic parameters of the five characters.And at the same time analysis was made on the correlation of the normal combing ability among the characters. The results showed the normal combining ability of the five characters were obviously higher than special combining ability and additive effect for the genes were dominant.h_B~2(%) for the five characters was 80.72,82.96,85.13,84.211 and 61.10 respectively and h_N~2 was 60.92,66.11,44.62 ,67.20 and 38.96 respectively.It was found by correlative analysis that branch number and spikelet density had highly significant positive correlation and significant positive correlation with normal combine ability of spikelet density per tassel respectively (r=0.934 7~(**),r=0.834 5~*).When selecting tassel,branch number and spikelet density should be considered in earlier generation.