水稻新品种粤农四麦高产指数及相关性状的2年QTL剖析

IF 4.5 Q1 PLANT SCIENCES
Shiguang Wang , Liting Zhang , Wei Liu, Xiaofei Wang, Haoxiang Wu, Hao Chen, Tengkui Chen, Zhanhua Lu, Xiuying He
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引用次数: 0

摘要

高收获指数(High harvest index, HI)是指粮食产量与生物量的比值(≥0.55),反映了一个平衡良好的源库关系。它是水稻高hi育种计划的关键性状,已被证明是培育超高产水稻品种的成功策略。然而,其遗传基础仍然难以捉摸。本研究利用改良粳稻品种“丽江新团黑谷”(LTH)与高产籼籼品种“越农四苗”(YNSM)杂交的重组自交系(RIL)群体,进行了高HI相关性状的QTL分析。在一个包含6674个bin标记的高密度遗传图谱中,鉴定出12个与水稻高致病性相关性状的97个QTL,形成13个影响水稻源库相关性状的QTL集群。这些bin标记是由1009324个来自RIL群体的高质量snp转化而来。值得注意的是,包括qFLL1、qSTW1、qBM1.2和qHI1在内的qRSC1(水稻源容量1的QTL集群)与半矮秆基因sd1紧密相连,共同塑造了YNSM的高HI植株结构。相比之下,qRSC3 (qFLL3/qFLW3/qSTW3/qBM3.1/qHI3.1)表现出相反的作用,并正调控源相关性状。在9个与单株产量(YPP)相关的QTL中,只有qYPP2.2,即qRSS2(水稻库大小2的QTL簇)的一部分,连续两年被检测到。qRSS2通过整合多个与产量相关的qtl(包括qYPP2.2)来控制汇大小。总体而言,qRSC1、qRSC3和qRSS2共同优化了源汇平衡,实现了YNSM的高HI和高产量。这些发现为研究高HI的遗传基础提供了依据,并为培育高HI的高产水稻提供了可能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Two-year QTL dissecting of high harvest index and related traits in a novel rice variety Yuenongsimaio
High harvest index (HI), defined as the grain yield-to-biomass ratio (≥ 0.55), reflects a well-balanced source-sink relationship. It is a key trait in rice high-HI breeding programs, which has proven to be a successful strategy for developing super high-yield rice varieties. However, its genetic basis remains elusive. This study conducted QTL analysis for HI-related traits using a recombinant inbred line (RIL) population derived from a cross between a geng/japonica cultivar, Lijiangxintuanheigu (LTH), and a high HI xian/indica variety, Yuenongsimiao (YNSM). A high‑density genetic map with 6674 bin markers identified 97 QTLs across 12 HI-related traits, forming 13 QTL clusters that affect the source-sink related traits in rice. These bin markers were converted from 1,009,324 high-quality SNPs sourced from the sequenced RIL population. Notably, qRSC1 (QTL cluster of rice source capacity 1), which included qFLL1, qSTW1, qBM1.2, and qHI1, was tightly linked to the semi-dwarf gene sd1 and collectively shaped the high HI plant architecture of YNSM. In contrast, qRSC3 (qFLL3/qFLW3/qSTW3/qBM3.1/qHI3.1) exhibited an opposite effect and positively regulated source-related traits. Among nine QTLs associated with yield per plant (YPP), only qYPP2.2, part of qRSS2 (QTL cluster of rice sink size 2), was consistently detected over two consecutive years. qRSS2 governed sink size by integrating multiple yield-related QTLs, including qYPP2.2. Overall, qRSC1, qRSC3, and qRSS2 collectively optimized source-sink balance, enabling YNSM’s high HI and high yields. These findings provide insights into the genetic basis of high HI in YNSM and may facilitate breeding high-yielding rice with superior HI.
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来源期刊
Current Plant Biology
Current Plant Biology Agricultural and Biological Sciences-Plant Science
CiteScore
10.90
自引率
1.90%
发文量
32
审稿时长
50 days
期刊介绍: Current Plant Biology aims to acknowledge and encourage interdisciplinary research in fundamental plant sciences with scope to address crop improvement, biodiversity, nutrition and human health. It publishes review articles, original research papers, method papers and short articles in plant research fields, such as systems biology, cell biology, genetics, epigenetics, mathematical modeling, signal transduction, plant-microbe interactions, synthetic biology, developmental biology, biochemistry, molecular biology, physiology, biotechnologies, bioinformatics and plant genomic resources.
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