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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (10): 1802-1809.doi: 10.3724/SP.J.1006.2012.01802

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Dynamic Analysis of QTL for Plant Height of Rapeseed at Different Developmental Stages

XIE Tian-Tian1,2, CHEN Yu-Bo3,2, HUANG Ji-Xiang2, ZHANG Yao-Feng2, XU Ai-Xia 4, CHEN Fei2, NI Xi-Yuan2, and ZHAO Jian-Yi2,*   

  1. 1 College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321000, China; 2 Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; 3 College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; 4 College of Agronomy, Northwest Agricultural and forestry University, Yangling 712100, China
  • Received:2012-03-04 Revised:2012-06-10 Online:2012-10-12 Published:2012-07-27
  • Contact: 赵坚义, E-mail: jyzhao3@yahoo.com, Tel: 0571-86403406

Abstract:

The main objective of this study was to explore the genetic control mechanism of plant height in rapeseed and to reveal its dynamic gene expression in specific growing period. Taking advantage of the updated SG map, we determined phenotypic data of plant height from 282 SG-DH lines in three environments and eight development stages, and analyzed both static and dynamic quantitative trait locus (QTL) with unconditional and conditional mapping approach. The results showed that when alleles from Gaoyou existed in two major QTLs PHA3 and PHC6 synchronously, the plant height could decrease about 20 cm; when alleles of plant height came from Sollux in PHA9 and PHC1, and Gaoyou in PHA1, PHA3 and PHC6, the plantsfell 40 cm in height. The mechanism of QTL for plant height was less affected by environment, but various QTLs showed difference in gene expression patterns: plant height was dominated by alleles from one of parents or from two parents by turns at different stages. In general, the QTL for plant height could be detected from the middle to late stages, while the gene expression appeared shortly and only during the most active growing period, in congruent with the rule of “trait appearance goes after genetic expression”.

Key words: Brasscia napus L., Plant height, Developmental stage, Static QTL, Dynamic QTL

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