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袁绍文1, 孙文强1,2, 王电文1,2, 余四斌1,2, 何菡子1
(1华中农业大学植物科学技术学院,武汉430070;2 华中农业大学作物遗传改良重点实验室,武汉430070)
穗颈维管性状是实现“源”合成的同化物输送至籽粒中的唯一通道。本研究利用来源于籼稻93-11(受体)和粳稻日本晴(供体)构建的染色体片段代换系群体,调查穗颈维管性状与穗部产量性状。结果表明,大部分穗颈维管性状与穗部产量性状呈显著相关;7 个穗颈维管性状共检测到42 个QTL,其中16 个位点日本晴等位基因起增效作用;6 个穗部产量性状共检测到45 个QTL,其中14 个位点日本晴等位基因起增效作用。综合分析穗颈维管性状与产量性状的QTL 定位区间,发现有6 个同时调控穗颈维管性状和穗部产量性状的QTL 簇,结合已有报道与候选基因序列分析,推测一因多效基因Ghd7 和IPA1 可能分别调控第7 染色体9Mb 和第8 染色体25Mb 的QTL 簇。这些结果暗示了水稻穗颈维管性状和产量性状既存在不同的遗传基础,也存在共同的遗传机制。挖掘更多控制“流”的QTL 与同时调控“流”和“库”的一因多效基因可为水稻聚合育种、品种改良提供十分重要的理论与实践意义。
关键词:  水稻  穗颈维管性状  产量  染色体片段代换系  数量性状位点(QTL)  一因多效基因
Genetic Analysis of Vascular Bundle-Related Traits of Neck-panicle and Yield Traits
YUAN Shao-wen1, SUN Wen-qiang1,2, WANG Dian-wen1,2, YU Si-bin1,2, HE Han-zi1
(1College of Plant Science and Technology of Huazhong Agricultural University, Wuhan 430070; 2 National Key Laboratory of Crop Genetic Improvement, Wuhan 430070)
Neck-panicle is the only channel for assimilation substance that transports to the panicle. In this study, 122 chromosome segment substitution lines (CSSL) derived from the cross between indica rice variety 93-11 and japonica rice variety Nipponbare were used to investigate vascular bundle-related traits of neck-panicle and yield traits. The results showed significant correlation between vascular bundle-related traits of neck-panicle and yield traits. A total of 42 quantitative trait loci (QTL) of vascular bundle-related traits and 45 QTL of yield traits were detected. Among them, 16 and 14 chromosomal regions with positive allelic effects were from Nippnbare and 93-11, respectively. Gained from the QTL mapping results of these two types of traits, six QTL clusters that regulate both vascular bundle-related and yield traits have been identified. Based on previous studies and the candidate gene analysis, two pleiotropic genes Ghd7 at the 9Mb site of chromosome 7 and IPA1 at the 25Mb site of chromosome 8 might be candidate, respectively. These results suggested a diversified genetic basis with partial common genetic mechanism for both rice vascular bundle-related traits and yield traits. Exploration of additional QTLs controlling "flow" and multiple genes regulating the interaction between "flow" and "sink" might provide theoretical and practical significance in rice breeding.
Key words:  rice  vascular bundle-related traits of neck-panicle  yield  chromosome segment substitution lines (CSSL)  quantitative trait loci (QTL)  pleiotropic genes