Mapping QTLs for heading synchrony in a doubled haploid population of rice in two environments

Simultaneous heading of plants within the same rice variety, also refer to heading synchrony, is an important factor that affects simultaneous ripening of the variety. Understanding of the genetic basis of heading synchrony may contribute to molecular breeding of rice with simultaneous heading and r...

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Bibliographic Details
Published in:Journal of genetics and genomics 2009-05, Vol.36 (5), p.297-304
Main Authors: Ma, Liangyong, Yang, Changdeng, Zeng, Dali, Cai, Jing, Li, Ximing, Ji, Zhijuan, Xia, Yingwu, Qian, Qian, Bao, Jinsong
Format: Article
Language:English
Subjects:
Breeding
Chromosome Mapping
Chromosomes, Plant - genetics
Crosses, Genetic
doubled haploid population
Environment
Haploidy
heading synchrony
LHD
Oryza - genetics
Oryza - physiology
Oryza sativa
Phenotype
QTLs
Quantitative Trait Loci
quantitative trait loci (QTL)
rice
研究
遗传学
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Summary:Simultaneous heading of plants within the same rice variety, also refer to heading synchrony, is an important factor that affects simultaneous ripening of the variety. Understanding of the genetic basis of heading synchrony may contribute to molecular breeding of rice with simultaneous heading and ripening. In the present study, a doubled haploid （DH） population, derived from a cross between Chunjiang 06 and TN1 was used to analyze quantitative trait locus （QTL） for heading synchrony related traits, i.e., early heading date （EHD）, late heading date （LHD）, heading asynchrony （HAS）, and tiller number （PN）. A total of 19 QTLs for four traits distributed on nine chromosomes were detected in two environments. One QTL, qHAS-8 for HAS, explained 27.7% of the phenotypic variation, co-located with the QTLs for EHD and LHD, but it was only significant under long-day conditions in Hangzhou, China. The other three QTLs, qHAS-6, qHAS-9, and qHAS-10, were identified under short-day conditions in Hainan, China, each of which explained about 11% of the phenotypic variation. Two of them, qHAS-6 and qHAS-9, were co-located with the QTLs for EHD and LHD. Two QTLs, qPN-4 and qPN-5 for PN, were detected in Hangzhou, and qPN-5 was also detected in Hainan. However, none of them was co-located with QTLs for EHD, LHD, and HAS, suggesting that PN and HAS were controlled by different genetic factors. The results of this study can be useful in marker assisted breeding for improvement of heading synchrony.
ISSN:1673-8527
DOI:10.1016/s1673-8527(08)60118-6