Detection of quantitative trait loci for leaf number in different photoperiod environments using an immortalized F2 population in temperate and tropical maize
To study the genetic basis of photoperiod sensitivity in maize, an immortalized F2 population of 278 F2 cross was constructed by intererossing recombinant inbred lines derived from a cross between temperate and tropical inbred lines ( Huangzaosi× CML 288 ). The "immortalized F2" was evaluated for leaf number in five locations with three photoperiod environments, i.e. a short day environment of Sanya in Hainan Province, long-day environments of Zhengzhou and Luoyang in Henan Province, and long-day environments of Shunyi and Changping in Beijing. Sixteen QTLs for leaf number were detected in different photoperiod environments using composite interval mapping. The QTLs qLN 4 -3 associated with leaf number were detected in all the three photoperiod environments, showing that this QTL might control leaf number steadily in different environments. The QTL qLN 10 in the bin 10.04 region of chromosome 10 associated with leaf number was detected in long day environments of Henan and Beijing and explained 31.75％ and 39.96％ of the phenotypic variation, respectively. This result indicated that the QTL qLN 10 might be a major leaf number QTL in long day environment. The QTL qLN 3 - 1 was detected for leaf number and explained 40.99％ of the phenotypic variation in short day environment and not in long day environment, which indicated that the QTL qLN3 - 1 might control leaf number only in short day environment.
immortalized F2 populationphotoperiodtropical maizeleaf numberquantitative trait loci
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