Abstract:

The RILs population derived from the cross between “Zhongyouzhao 8” (Hsien or Indica) and “Fengjin” (Keng or Japonica) was grown in Liaoning and Sichuan province to compare the subspecies characteristics under different environments .The results showed that the distribution of Cheng’s index was japonicalinous. The population was more japonicalinous in Sichuan than in Liaoning as a whole. Further analysis indicated that indica and indica-cline in Sichuan were more indicalinous than those in Liaoning, japonica and japonica-cline in Sichuan were more japonicalinous than those in Liaoning. The effects of environment on six characteristics of Cheng’s index were different because of different characters, as well as on the correlations between the six characters, the Cheng’s index and the vascular bundle traits. For example, the length of first and second rachises and leaf pubescence were more japonicalinous in Sichuan than in Liaoning, while the length/width ratio of spikelets and glume color at heading time were more indicalinious in Sichuan than in Liaoning. The vascular bundle characteristics of RILs in different environments changed remarkably. The number of large vascular bundles in panicle neck was less in Sichuan than in Liaoning, and the number of small vascular bundles in panicle neck and second top stem was greater in Sichuan than in Liaoning. The ratio of large to small vascular bundles in panicle neck was decreased and the ratio of large vascular bundles between the second top stem and panicle neck was increased in Sichuan. Though total trend was the vascular bundle ratio of large to small in indica was greater than that in japonica and the ratio of large vascular bundles in indica was less than that in japonica, it is not appropriate that the vascular bundle ratio of large to small and the ratio of large vascular bundles are regarded as the parameters for subspecies classification in rice. The vascular bundles characteristics from typical indica or japonica were recombined in the population derived from indica and japonica crossing.

Key words: Rice, Environment, Cross between indica and janponica, Subspecies classification of indica and japonica