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《Journal of Anhui Agricultural Sciences》 2008-06
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Genetic Analysis of Dominant Compound Inflorescence Trait in Tomato

OUYANG Zhu-cai et al(Management Office of Teaching and Scientific Research Base,South China Agricultural University,Guangzhou,Guangdong 510642)  
[Objective] The aim of the research was to discuss the genetic characteristics of dominant compound inflorescence trait in tomato.[Method] With 6 generations obtained from cross and backcross and their parents of single-inflorescence tomato inbred line 860 and compound-inflorescence tomato inbred line HYT as tested materials,the inflorescence trait and fruit weight in the parents and their progenies were investigated.And the genetic analysis of inflorescence trait in F2 population and backcross generations was made.[Result] The compound-inflorescence trait in parent HYT was stable and there were wholly unbranched single-inflorescence in parent 860.Flower number and fruit weight had negative correlation.The average fruit weight in parent HYT with more flowers was lower(24.0 g),while that in parent 860 with less flowers was higher(95.9 g).The inflorescence characteristics in F1 generation were almost the same as compound-inflorescence parent HYT and the proportion of compound-inflorescence to single-inflorescence in F2 population was 3∶1,which preliminarily indicated that compound-inflorescence trait was dominant.All the backcross progenies of F1 and parent HYT were of compound-inflorescence and the inflorescence trait in the backcross progenies of F1 and parent 860 showed the separation with the proportion of 1∶1,which indicated that the compound-inflorescence in HYT was controlled by single dominant gene.[Conclusion] Dominant compound-inflorescence gene could improve the breeding efficiency of tomato.So it had certain application value in the breeding of tomato.
【Fund】: 广东省农业攻关项目(2004A20103002);; 广东省农业科技推广项目
【CateGory Index】: S641.2
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