Ma Liangyong, Yang Changdeng, Zeng Dali, Cai Jing, Li Ximing, Ji Zhijuan, Xia Yingwu, Qian Qian, Bao Jinsong
State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China.
J Genet Genomics. 2009 May;36(5):297-304. doi: 10.1016/S1673-8527(08)60118-6.
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.
同一水稻品种内植株的同时抽穗，也称为抽穗同步性，是影响该品种同时成熟的一个重要因素。了解抽穗同步性的遗传基础可能有助于进行同时抽穗和成熟的水稻分子育种。在本研究中，以春江06和TN1杂交衍生的加倍单倍体（DH）群体为材料，分析与抽穗同步性相关性状的数量性状位点（QTL），即早抽穗期（EHD）、晚抽穗期（LHD）、抽穗异步性（HAS）和分蘖数（PN）。在两个环境中检测到分布在9条染色体上的4个性状的19个QTL。一个控制HAS的QTL，qHAS - 8，解释了27.7%的表型变异，与EHD和LHD的QTL共定位，但仅在中国杭州的长日条件下显著。另外三个QTL，qHAS - 6、qHAS - 9和qHAS - 10，是在中国海南的短日条件下鉴定到的，每个QTL解释约11%的表型变异。其中两个，qHAS - 6和qHAS - 9，与EHD和LHD的QTL共定位。在杭州检测到两个控制PN的QTL，qPN - 4和qPN - 5，在海南也检测到了qPN - 5。然而，它们均未与EHD、LHD和HAS的QTL共定位，这表明PN和HAS受不同遗传因素控制。本研究结果可用于标记辅助育种以改善抽穗同步性。
