qDTY12.1: a locus with a consistent effect on grain yield under drought in rice.
qDTY12.1: a locus with a consistent effect on grain yield under drought in rice.
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DOI：
10.1186/1471-2156-14-12
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发表时间：
2013-02-26
期刊：
影响因子：
2.9
通讯作者：
Kumar A
中科院分区：
文献类型：
--
作者：
Mishra KK;Vikram P;Yadaw RB;Swamy BP;Dixit S;Cruz MT;Maturan P;Marker S;Kumar A
干旱条件下的产量选择是提高水稻抗旱性的有效标准。近年来，利用这一选择标准开发了一些耐旱水稻品种，并成功地在干旱易发的目标环境中进行了栽培。这一过程可以通过标记辅助育种来提高效率和速度，这是一种众所周知的作物改良快速通道方法。已鉴定出干旱条件下粮食产量的qtl，对干旱易感品种有较大影响。大多数QTL与环境或遗传背景之间存在较大的相互作用。以热门高产品种为背景，开发定位群体，进行包括目标环境在内的跨环境筛选，鉴定跨环境效应一致的qtl，可以作为一种合适的替代标记辅助育种策略。2011年旱季和雨季，分别在菲律宾国际水稻研究所和尼泊尔区域农业研究站对IR74371-46-1-1 × Sabitri回交自交系群体进行了生殖期干旱胁迫筛选。采用群体分离分析方法鉴定干旱条件下粮食高产相关标记。在12号染色体上发现了一个与生殖期干旱胁迫下籽粒产量显著相关的QTL qDTY12.1，该QTL在菲律宾的IRRI和尼泊尔的RARS环境中具有一致的影响。该QTL对干旱条件下粮食产量的表型变异贡献率为23.8%，加性效应贡献率为45.3%。qDTY12.1的阳性等位基因由亲本IR74371-46-1-1贡献。在本研究中，qDTY12.1在低地生殖期干旱胁迫下，以高产但干旱敏感的热门受体品种Sabitri为背景，在不同环境下表现出一致的高产效应。qDTY12.1在旱地生殖期干旱胁迫下具有提高粮食产量的作用[作物科学47:507 - 516,2007]。qDTY12.1是迄今为止报道的唯一一个在水稻中对多种受体遗传背景以及高度多样化的旱地和低地水稻生态系统显示出巨大影响的QTL。qDTY12.1可以通过标记辅助育种，成功地渗入到普通高产易旱低地和旱地适应品种的干旱增产中。
Selection for grain yield under drought is an efficient criterion for improving the drought tolerance of rice. Recently, some drought-tolerant rice varieties have been developed using this selection criterion and successfully released for cultivation in drought-prone target environments. The process can be made more efficient and rapid through marker-assisted breeding, a well-known fast-track approach in crop improvement. QTLs have been identified for grain yield under drought with large effects against drought-susceptible varieties. Most of the identified QTLs show large QTL × environment or QTL × genetic background interactions. The development of mapping populations in the background of popular high-yielding varieties, screening across environments, including the target environments, and the identification of QTLs with a consistent effect across environments can be a suitable alternative marker-assisted breeding strategy. An IR74371-46-1-1 × Sabitri backcross inbred line population was screened for reproductive-stage drought stress at the International Rice Research Institute, Philippines, and Regional Agricultural Research Station, Nepalgunj, Nepal, in the dry and wet seasons of 2011, respectively. A bulk segregant analysis approach was used to identify markers associated with high grain yield under drought. A QTL, qDTY12.1, significantly associated with grain yield under reproductive-stage drought stress was identified on chromosome 12 with a consistent effect in two environments: IRRI, Philippines, and RARS, Nepalgunj, Nepal. This QTL explained phenotypic variance of 23.8% and contributed an additive effect of 45.3% for grain yield under drought. The positive QTL allele for qDTY12.1 was contributed by tolerant parent IR74371-46-1-1. In this study, qDTY12.1 showed a consistent effect across environments for high grain yield under lowland reproductive-stage drought stress in the background of popular high-yielding but drought-susceptible recipient variety Sabitri. qDTY12.1 was also reported previously [Crop Sci 47:507–516, 2007] to increase grain yield under upland reproductive-stage drought stress situations. qDTY12.1 is the only QTL reported so far in rice to have shown a large effect against multiple recipient genetic backgrounds as well as under highly diverse upland and lowland rice ecosystems. qDTY12.1 can be successfully introgressed to improve grain yield under drought of popular high-yielding but drought-susceptible lowland as well as upland adapted varieties following marker-assisted breeding.
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影响因子：
2.9
作者：
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影响因子：
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