Abstract: In order to reveal the relations between the characters of vascular bundle and panicle in rice, An F6 population from a cross between a japonica variety Zhongyouzao 8 and an indica variety Fengjin was used as materials. There was a significantly positive correlations between the number of the large and small vascular bundle of the neck-panicle, the number of the large and small vascular bundle of the second internode, the efficiency of large vascular bundles and primary rachis branches and the number of the first and second branches and their grains and filled grains, the length of the first and second branches, secondary rachis branches grains rate, panicle neck width, the length and weight of panicle, grains density, the number of grains and filled grains per panicle, and the yield of per panicle, respectively. But the number of panicle was opposite. The relations between the characters of vascular bundle and secondary rachis branches was closer than primary rachis branches. The relation between the ratio of large vascular bundles to small vascular bundles of the second internode, the ratio of large vascular bundles between the second top stem and neck-panicle, that of the small one and panicle traits is negative. There was not correlation between the characters of vascular bundle and seed setting rate, 1000-grain weight, panicle type index, the first node length of panicle. Regression and path analysis for the characters of vascular bundle and panicle showed the efficiency of primary rachis branches had a greatly direct effect on the grains per panicle, the number of the first and second branches and their grains, and yield per panicle. The effect of primary rachis branches efficiency for yield per panicle was the most. The efficiency of large vascular bundles had a greatly indirect effect on those characters. The efficiency of large vascular bundles exceeded 0.5 in japonica and pre-japonica rice, but the rice of indica and pre-indica was opposite. The efficiency of primary rachis branches was nearly 1.0 in indica and pre-indica rice, but the rice of japonica and pre-japonica was about 0.5. There was a close correlation between the efficiency of large vascular bundles and primary rachis branches and the panicle characters, and yield per panicle. The vary degree of the efficiency of large vascular bundles and primary rachis branches was notably different in parents and its hybrid descendants. Because it reflected the good configuration and function of panicle characters, it could be thought of a reference standard as the choice of good panicle characters.

Key words: Rice (Oryza sativa), Indica and japonica crossing, Characters of vascular bundle, Characters of panicle, Large vascular bundles efficiency, Primary rachis branches efficiency

CLC Number: 

• S511.201