摘要
Heading date(HD) and photoperiod sensitivity(PS) are important traits for the adaptation of rice to different cultivation areas and cropping seasons,and are significantly affected by environmental factors. Identification of the HD and PS adaptation among rice varieties could prove invaluab le information during rice germplasm management and help researchers develop strategies to improve cultivars. In our study,HDs of 583 major inbred japonica varieties native to different regions in China were analyzed under organic farming conditions in Hangzhou and Sanya for four years. Basic vegetative phase(BVP),photoperiod sensitivity index(PSI),the original climatic and geographical information(temperature,latitude and longitude) were analyzed. Phenotypic variation analysis showed BVP,HD and PSI exhibited distinct ecological and geographical distributions in China. Correlation and regression analysis showed that BVP,latitude,longitude,PSI,and temperature could affect HD differently in the five main ecologically distinct rice growing regions. Five regression equations were obtained for predicting the adaptation of japonica rice in the five ecological regions. The Shannon-Weaver diversity index on the phenotype of BVP,HD and PSI showed an overall mean of 0.47 in the germplasm collection,and exhibited wide ecologically and geographically distribution. Cluster analysis demonstrated that HD plays an important role in the regional adaptation of rice and that there had been some changes in the regionalization of Chinese japonica varieties during the past 50 years. Cluster analysis also showed that there were sub-regions between and in the five main regions,These results would be useful for rice introduction and commercial extension of rice cultivars to different cropping regions in China,and also be important to analyze the effects of global warming on rice regionalization. Meanwhile,methods used in the study have reference values to the rice regionalization analysis in other countries owning a number of rice ecological regions.
Heading date(HD) and photoperiod sensitivity(PS) are important traits for the adaptation of rice to different cultivation areas and cropping seasons,and are significantly affected by environmental factors. Identification of the HD and PS adaptation among rice varieties could prove invaluab le information during rice germplasm management and help researchers develop strategies to improve cultivars. In our study,HDs of 583 major inbred japonica varieties native to different regions in China were analyzed under organic farming conditions in Hangzhou and Sanya for four years. Basic vegetative phase(BVP),photoperiod sensitivity index(PSI),the original climatic and geographical information(temperature,latitude and longitude) were analyzed. Phenotypic variation analysis showed BVP,HD and PSI exhibited distinct ecological and geographical distributions in China. Correlation and regression analysis showed that BVP,latitude,longitude,PSI,and temperature could affect HD differently in the five main ecologically distinct rice growing regions. Five regression equations were obtained for predicting the adaptation of japonica rice in the five ecological regions. The Shannon-Weaver diversity index on the phenotype of BVP,HD and PSI showed an overall mean of 0.47 in the germplasm collection,and exhibited wide ecologically and geographically distribution. Cluster analysis demonstrated that HD plays an important role in the regional adaptation of rice and that there had been some changes in the regionalization of Chinese japonica varieties during the past 50 years. Cluster analysis also showed that there were sub-regions between and in the five main regions,These results would be useful for rice introduction and commercial extension of rice cultivars to different cropping regions in China,and also be important to analyze the effects of global warming on rice regionalization. Meanwhile,methods used in the study have reference values to the rice regionalization analysis in other countries owning a number of rice ecological regions.
引文