Quantitative Trait Loci Mapping of Agronomic and Yield Traits in Two Grain Sorghum Biparental Families
Quantitative Trait Loci Mapping of Agronomic and Yield Traits in Two Grain Sorghum Biparental Families
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DOI：
10.2135/cropsci2016.12.0988
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发表时间：
2017-09-01
期刊：
影响因子：
2.3
通讯作者：
Kresovich, Stephen
中科院分区：
文献类型：
--
作者：
Boyles, Richard E.;Pfeiffer, Brian K.;Kresovich, Stephen
畜牧业是美国东南部农业的主要部门，但支持该行业所需的地区饲料谷物存在巨大缺口。高粱[Sorghum biolor(L.)在边际土地上种植一种水分和养分利用效率高的谷类作物，可能会为种植者带来另一种作物选择，并减少目前的粮食赤字。为了更好地了解高粱双亲重组自交系产量的遗传基础，并在边缘环境下对这些性状进行了数量性状基因座(QTL)定位。对这些复杂性状背后的遗传学有更深入的了解，可以为旨在增加遗传收益的分子育种策略提供见解。所研究的特定产量性状为每一穗粒数(GNP)、千粒重(TGW)和每一穗产量(YPP)。南卡罗来纳州沿海平原的两年表型显示，GNP和YPP的变异都超过三倍，而TGW的变异在两个RIL家族中都刚刚超过两倍。在两个群体中检测到16个总产量性状QTL。在这16个QTL中，有8个QTL与先前公布的产量相关性状QTL并列定位，其中1号染色体上的一个QTL对所有三个籽粒产量构成因素都有显著影响。在第5染色体上发现了一个新的TGW QTL，它解释了在一个RIL群体中观察到的>；21%的表型变异。该QTL和本研究发现的另外7个新的QTL为高粱籽粒产量改良提供了新的靶标。
The animal industry is a major sector of agriculture in the southeastern United States, but a large deficit exists in regional feed grains needed to support the industry. An increase in production of sorghum [Sorghum bicolor (L.) Moench], a water-and nutrient-use-efficient cereal, on marginal lands could lead to an alternative crop option for growers and reduce the current grain deficit. Quantitative trait locus (QTL) mapping of grain yield components in two sorghum biparental recombinant inbred line (RIL) populations was performed to better understand the genetic basis of grain yield and characterize these traits in a marginal environment. A more robust knowledge of the genetics underlying these complex traits could provide insights into molecular breeding strategies that aim to increase genetic gain. Specific yield traits investigated were grain number per primary panicle (GNP), 1000-grain weight (TGW), and grain yield per primary panicle (YPP). Two-year phenotyping in the South Carolina coastal plain revealed greater than threefold variation for both GNP and YPP, whereas TGW variation was just above twofold in both RIL families. There were 16 total yield trait QTL identified across both populations. Of the 16, eight QTL colocated with previously published QTL for yield-related traits, including a QTL on chromosome 1 that was significant for all three grain yield components. A novel QTL for TGW was identified on chromosome 5 that explained >21% of the phenotypic variance observed in one RIL population. This QTL and the seven additional novel QTL identified in this study provide new targets for grain yield improvement in sorghum.