关键词: 早稻[49EJ], 杂交[45CC, 49DB], 经济性状, 相关分析[32A, 32DA], 主成份分析[30R], 高产育种

Abstract: Path coefficiency analysis and principle component analysis on the main traits of early-season hybrid rice were carried out by using 16 early-season hybrid rice combinations. The results slow as follows:There were complicated correlation ships between yield and yield components, and between yield components. Filled seed per panicle and plant height had higher direct contribution to high grain yield. However, the direct contribution of growth duration and the indirect contrihutions of other traits through growth duration to high yield were comparatively unsignificant. Thus, it is quite possible to increase the grain yield of early-season hybrid rice. According to the cumulative pet. of variability >85, four principle components, including spikelet number per panicle, seed percentage, 1000-grain weight and panicle length, were selected out. In the end, the breeding strategy for improving early-season hybrid rice was discussed.

Key words: EARLY RICE, HYBRIDIZATION, ECONOMIC TRAIT, CORRELATION ANALYSIS, PRINCIPAL COMPONENT ANALYSIS, HIGH-YIELD BREEDING