棉 花 学 报    Cotton Science   2007，19(1)：3-7

Heterosis Performance and Correlation Analysis on Economic Traits of Upland Cotton under Various 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 of，MOA，Anyang，Henan 455000，China)

Abstract：The transgenic Bt hybrids cotton accounted for 80% of total hybrids cotton area in China，so it was very important to study their traits and heterosis under different ecological environments. The mating design used in the experiment was North Carolina II. Six females from the Yangtse River Valley and the Huanghe River Valley were crossed to each of four males with transgenic Bt. The 24 crosses and their 10 parents were planted at three locations on Wangjiang Cotton Experimental Farm in Anhui Province，Anyang Cotton Experimental Farm in Henan Province，and Sanya in Hainan Province，respectively. The experimental design was a randomized complete blocks. 50 normal opened bolls were picked for assaying the boll weight，lint percentage. Seed cotton was harvested eventually. The crosses and parents ′fiber samples were tested with HVI system in Cotton Research Institute of CAAS.The results showed that yield traits surpassing parent heterosis in transgenic hybrid cotton were much widely existed under various ecological environments. Among these heterosis，lint and seed cotton yield heterosis were higher，followed by boll number. Under high production environment，hybrids and their parents had higher yield，but heterosis was not evident. Under relatively low production levels ， hybrids had relatively lower yield，but heterosis was significant，Those indicated that hybrids yield performances were relatively stable in three kinds of environments，and parental yield were greatly affected by environments. Fiber quality traits varied with environment changes，but the heterosis surpassed by parent was not significant. Correlation analysis showed the boll number had the closest relation with lint yield. There were significant positive correlations among boll number，boll size and lint percentage，which indicated the three yield traits may be synchronously improved through parents selection. Correlation was inconsistent between fiber quality traits，and micronaire was a significantly positive correlation with other fiber traits，so it was attached importance to selecting low value micronaire materials in high yield and fine quality hybrid breeding.
Key words：upland cotton；ecological environment；heterosis；correlation analysis.  [Full Text，2146KB]