关键词: 不完全双列杂交, 多性状, 综合杂种优势, 主成分分析

Abstract: By using the principle of principal component analysis, the authors present the method of measuring synthetic heterosis of multi character in incomplete diallel cross experiments of maize. The synthetic heterosis of multi character is defined as the sum of heteroses of pincipal components of the products of the observation of each trait with significant genetic difference with their relative weights. With this method, the relative importance of each character is under consideration, and correlation among characters and effect of environments are eliminated. The estimates of synthetic heterosis are rational and reliable. The method presented in the paper can be used to measure synthetic heterosis of multi character of other types of cross experiments of maize and other crops.

Key words: LNCOMPLETE DIALLEL CROSS, MULTI CHARACTER, SYNTHETIC HETEROSIS, PRINCIPAL COMPONENT ANALYSIS