Taking the main parents （10 male sterile lines and 10 restorer lines） and their 100 combinations of japonica hybrid rice in northern China as materials, the relationships of parental indica-japonica indexes determin...Taking the main parents （10 male sterile lines and 10 restorer lines） and their 100 combinations of japonica hybrid rice in northern China as materials, the relationships of parental indica-japonica indexes determined by the methods of the Cheng’s index as well as simple sequence repeat （SSR） markers with yield and grain quality traits of hybrid rice were studied. For the parents, the Cheng’s index （Chi） ranged from 13.5 to 19.3 and the indica index in SSR markers （ADi） were from 0.12 to 0.38. The classification of parents by Chi was not completely consistent with that by ADi. The Chi of male parent was more closely related to hybrid traits than that of female parent, as contrasted to ADi. At the same time, the difference between parents （PD） in Chi was more closely related to hybrid traits than that in ADi. The indica-japonica indexes of parents and their difference between parents appeared quadratic relationship to hybrid traits with the critical extremum. The directions of the correlation of indica-japonica indexes of parents and their differences with hybrid yield traits were on the opposition to those with hybrid grain quality traits. Therefore, the female parent should match the male parent moderately in indica-japonica index to obtain the optimum of hybrid traits, high yield as well as good quality.展开更多
A total of 100 cultivated rice accessions,with a clear isozyme-based classification,were analyzed based on Cheng＇s index and simple sequence repeat （SSR） marker.The results showed that the isozyme-based classificat...A total of 100 cultivated rice accessions,with a clear isozyme-based classification,were analyzed based on Cheng＇s index and simple sequence repeat （SSR） marker.The results showed that the isozyme-based classification was in high accordance with that based on Cheng＇s index and SSR markers.Mantel-test revealed that the Euclidean distance of Cheng＇s index was significantly correlated with Nei＇s unbiased genetic distance of SSR markers （r=0.466,P ≤ 0.01）.According to the model-based group and cluster analysis,the Cheng＇s index-and SSR-based classification coincided with each other,with the goodness of fit of 82.1% and 84.7% in indica,97.4% and 95.1% in japonica,respectively,showing higher accordance than that within subspecies.Therefore,Cheng＇s index could be used to classify subspecies,while SSR marker could be more efficient to analyze the subgroups within subspecies.展开更多
基金supported by the National Key Technology R & D Program of China (Grant No. 2006BA01A01-7)
文摘Taking the main parents （10 male sterile lines and 10 restorer lines） and their 100 combinations of japonica hybrid rice in northern China as materials, the relationships of parental indica-japonica indexes determined by the methods of the Cheng’s index as well as simple sequence repeat （SSR） markers with yield and grain quality traits of hybrid rice were studied. For the parents, the Cheng’s index （Chi） ranged from 13.5 to 19.3 and the indica index in SSR markers （ADi） were from 0.12 to 0.38. The classification of parents by Chi was not completely consistent with that by ADi. The Chi of male parent was more closely related to hybrid traits than that of female parent, as contrasted to ADi. At the same time, the difference between parents （PD） in Chi was more closely related to hybrid traits than that in ADi. The indica-japonica indexes of parents and their difference between parents appeared quadratic relationship to hybrid traits with the critical extremum. The directions of the correlation of indica-japonica indexes of parents and their differences with hybrid yield traits were on the opposition to those with hybrid grain quality traits. Therefore, the female parent should match the male parent moderately in indica-japonica index to obtain the optimum of hybrid traits, high yield as well as good quality.
基金supported by the Crop Genetic Resources Protection Project of Ministry of Agriculture,Chinathe Basic Research Budget of China National Rice Research Institute(Grant No. 2009RG001-3)
文摘A total of 100 cultivated rice accessions,with a clear isozyme-based classification,were analyzed based on Cheng＇s index and simple sequence repeat （SSR） marker.The results showed that the isozyme-based classification was in high accordance with that based on Cheng＇s index and SSR markers.Mantel-test revealed that the Euclidean distance of Cheng＇s index was significantly correlated with Nei＇s unbiased genetic distance of SSR markers （r=0.466,P ≤ 0.01）.According to the model-based group and cluster analysis,the Cheng＇s index-and SSR-based classification coincided with each other,with the goodness of fit of 82.1% and 84.7% in indica,97.4% and 95.1% in japonica,respectively,showing higher accordance than that within subspecies.Therefore,Cheng＇s index could be used to classify subspecies,while SSR marker could be more efficient to analyze the subgroups within subspecies.
