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《JOURNAL OF CHINA AGRICULTURAL UNIVERSITY》 2000-03
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Study on Heterotic Ecotype of Two Line Japonica Hybrid Rice in North China

Chen Liang Sun Chuanqing Li Zichao Wang Xiangkun(College of Crop Sciences, CAU)  
Four photoperiod (themo ) sensitive genic male sterile rice lines, pei'ai64s,N422s,108s,LS2s were crossed with 12 ecotypes of Asian cultivated rice to select heterotic ecotypes of two line japonica hybrid rice in north China based on the analysis of F 1s' yield. The results showed that javanica ecotype, north China ecotype of improved varieties, Korea ecotype (including local and improved varieties), south China ecotype of improved varieties, northeast China ecotype (including local and improved varieties) in japonica subspecies were heterotic ecotypes of pei'ai64s; South China ecotype (including local and improved indica varieties), nuda ecotype, north China ecotype (including local and improved japonica varieties) ,new plant type indica and so on were heterotic ecotypes of N422s;South China ecotype of local indica varieties, north China ecotype of local japonica varieties, Korea ecotype of local japonica varieties, new plant type indica were heterotic ecotypes of 108s;The F 1 s between LS2s and javanica ecotype and north China ecotype (including local and improved japonica varieties) had more significant heterosis than others. The selection of heterotic ecotype of rice and application of the 4 sterile lines and the 12 ecotypes in the breeding program of two line japonica hybrid rice in northern China were discussed. The experiment suggested that pei'ai64s, N422s, 108s were of better wide compatibility and better combining ability while LS2s was poor in wide compatibility and combining ability. It is suggested that the local restorer lines and sterile lines are worth being paid more attention when investigating heterotic ecotype of rice.
【CateGory Index】: S511.103.5.1
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