• 作物遗传育种·种质资源·分子遗传学 •

玉米光周期敏感相关性状发育动态QTL定位

1. 河南农业大学农学院，河南郑州450002
• 收稿日期:2009-08-09 修回日期:2009-12-08 出版日期:2010-04-12 网络出版日期:2010-01-22
• 通讯作者: 陈彦惠,E-mail:chy989@sohu.com
• 基金资助:

本研究由国家高技术研究发展计划(863计划)重大专项(2006AA100103)和河南省重大科技专项(06200110200)资助.

QTL Analysis of the Photoperiod Sensitivity-Related Traits at Different Developmental Stages in Maize(Zea mays L.)

KU Li-Xia,SUN Zhao-Hui,WANG Cui-Ling,ZHANG Jun,ZHANG Wei-Qiang,CHEN Yan-Hui*

1. College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China
• Received:2009-08-09 Revised:2009-12-08 Published:2010-04-12 Published online:2010-01-22
• Contact: CHEN Yan-Hui,E-mail:chy989@sohu.com

Abstract:

Maize is originally a short-day species and most tropical materials remain highly sensitive to photoperiod. Photoperiod sensitivity limits the potential for successful exchange of germplasm across temperate-tropical regions. Therefore, it would be very useful for breeders to better investigate the genetic basis of photoperiod sensitivity due to not only being benificial to expansion, improvement and innovation of germplasm but also enhancing adaptation of maize varieties to seasonal changes in the length of a day (photoperiod). For identifying the genetic controls underlying this adaptation at different development stages in maize, a set of 207 recombinant inbred lines derived from a temperate and a tropical inbred line cross was evaluated for leaf number and seedling or plant height at different developmental stages in a long-day environment. The results showed there was apparent difference in the average of leaf number and plant height for two parents. Leaf number and seedling height of the parent CML288 were less than those of Huangzao 4 at the beginning of plant development tested, but were more than those of Huangzao 4 at the later developmental stages. There was significant difference in the traits at the tested developmental stages for F7 recombinant inbred lines. The unconditional and conditional QTLs for these traits were detected using genetic linkage maps constructed by 237 SSR markers with a total length of 1753.6 cM and an average space between two markers of 7.4 cM, and composite interval mapping (CIM). Eleven and twenty QTLs were detected for leaf number and plant height, respectively. But there was no effect of conditional QTL at all the tested developmental stages. The conditional and unconditional QTLs for leaf number and plant or seedling height were mapped on chromosomes 1, 9 and 10. Especially, the QTLs located on chromosome 10 (near to umc1873) were for two traits at the later developmental stages, accounting for 4.34–25.74% and 10.02–22.75% of total phenotypic variation by single conditional and unconditional QTL, respectively. These results showed that these regions might encompass some crucial candidate genes controlling photoperiod sensitivity.