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Published in Crop Sci 39:538-544 (1999)
© 1999 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Molecular Marker-Assisted Dissection of Genotype x Environment Interaction for Plant Type Traits in Rice (Oryza sativa L.)

Juqiang Yan*

Dep. of Biological Science, Texas Tech. Univ., Lubbock, TX 79409-3131 and Agronomy Dep., Zhejiang Univ., Hangzhou, Zhejiang, China

Jun Zhu, Cixin He and Mebrouk Benmoussa

Agronomy Dep.

Ping Wu

Biological Science Dep., Zhejiang Agric. Univ., Hangzhou, 310029, China

* Corresponding author (jqyan_98{at}yahoo.com).

A doubled haploid (DH) population of 123 lines from IK64/Azucena was used to analyze the genotype x environment (GE) interaction for eight plant type traits in rice (Oryza sativa L.). The total genetic effects were partitioned into genetic main effects and GE interaction effects. These two kinds of predicted effects were used in mapping quantitative trait loci (QTLs). Four to nine QTLs affecting different plant type traits were detected. Results indicated that all common QTLs detected in both environments were controlled by genetic main effects and some also by GE interaction effects. Some genomic regions identified significant QTL in only one environment; some also showed genetic main effects. Those QTLs with genetic main effects could be used in marker-assisted selection across environments. For some other map regions, QTLs were controlled by only GE interaction effects without genetic main effects. Those QTLs could be included in marker-assisted selection only for specific environments. In most cases, the pairs of traits with a high genetic correlation shared more common QTL regions than those pairs of traits with a lower genetic correlation.

Received for publication May 18, 1998.


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