Original：Cotton Science，2007，19(1)：3-7

Heterosis Performance and Correlation Analysis on Economic
Traits of Upland Cotton Hybrids in Different Ecological Environments
XING Chao-zhu, YU Shu-xun, GUO Li-ping, MIAO Cheng-duo,
FENG Wen-juan, WANG Hai-lin, ZHAO Yun-lei
(Cotton Research Institute, CAAS, Key Laboratory for Cotton Genetic Improvement, MOA, Anyang, Henan 455000, China)

Abstract：24 combinations by NC Ⅱ mating design and their ten parents were used to evaluate their surpassing parental heterosis of yield and fiber quality traits in three different ecological environments. The results showed that surpassing parental heterosis of yield traits were widely existed in three ecological environments. Especially the lint and seed cotton yield performed the most prominent heterosis, followed by boll number. In the Yangtze River Valley experimental stations, the hybrids and their parents had higher yield, but heterosis was not significant, and in Sanya, Hainan and Anyang, Henan experimental station with relatively lower production levels, though the hybrids had relatively low yield, their parents were significantly lower than the hybrids in yield, so heterosis was significant. This indicated that hybrids exhibited relatively stable yield performances in different environments, but the parents were greatly affected by environments. Fiber quality traits varied with ecological environments, but the surpassing parental heterosis was not significant. Correlation analysis showed that the boll numbers had the closest relation with lint yield. Moreover, there were significantly positive correlations among boll number, boll weight and lint percentage, which indicated the three yield traits can be simultaneously improved through parents selection. Correlations were inconsistent among fiber quality traits in different environments, while the micronaire had significantly positive correlation with other fiber quality traits, hence it was very important to select materials with low micronaire value as parents in high yield and fine fiber quality hybrid breeding.
Key words：upland cotton( G.hirsutum L.); ecological environment; heterosis; correlation analysis
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