Breeding high-yielding drought-tolerant rice: genetic variations and conventional and molecular approaches.
Breeding high-yielding drought-tolerant rice: genetic variations and conventional and molecular approaches.
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DOI：
10.1093/jxb/eru363
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发表时间：
2014-11
影响因子：
6.9
通讯作者：
Mandal NP
中科院分区：
文献类型：
--
作者：
Kumar A;Dixit S;Ram T;Yadaw RB;Mishra KK;Mandal NP
本研究通过对水稻抗旱产量QTL的鉴定和分子标记辅助导入，探讨了在不影响正常产量的情况下，对干旱胁迫下的水稻品种进行改良。近年来，干旱胁迫的发生和严重程度增加，导致受干旱影响地区的水稻产量大幅下降。国际水稻研究所（IRRI）过去十年的干旱研究主要集中在干旱条件下粮食产量的直接选择上。这一方法已导致在南亚、东南亚和非洲成功开发和发布了17种高产耐旱水稻品种。此外，还以产量为选择标准，对14个对抗旱性敏感的高产品种有较大影响的数量性状位点（QTL）进行了鉴定。其中6个（qDTY 1.1、qDTY 2.2、qDTY 3.1、qDTY 3.2、qDTY 6.1和qDTY 12.1）在低地和高地生态系统中都表现出对两种或两种以上高产遗传背景的效应，表明它们在干旱条件下增加水稻籽粒产量方面是有用的。通过精心设计的分子标记辅助回交育种方法，已经成功地提高了流行水稻品种IR64和Vandana的产量，并且正在进行其他几个流行品种的QTL渐渗。对干旱条件下籽粒产量的大效应QTL的鉴定以及通过使用这些QTL获得的干旱条件下较高的产量增加（这在其他谷物中还没有报道）表明，由于水稻在两种不同的生态系统（高地，耐旱，和低地，干旱敏感）中的连续栽培，其受益于比其他谷物更大的遗传变异的存在。这可以通过标记辅助育种成功地加以利用。
This study discusses improvement of popular rice varieties under drought through the identification and marker-assisted introgression of drought yield QTLs without any adverse effect on yield under normal conditions. The increased occurrence and severity of drought stress have led to a high yield decline in rice in recent years in drought-affected areas. Drought research at the International Rice Research Institute (IRRI) over the past decade has concentrated on direct selection for grain yield under drought. This approach has led to the successful development and release of 17 high-yielding drought-tolerant rice varieties in South Asia, Southeast Asia, and Africa. In addition to this, 14 quantitative trait loci (QTLs) showing a large effect against high-yielding drought-susceptible popular varieties were identified using grain yield as a selection criterion. Six of these (qDTY 1.1, qDTY 2.2, qDTY 3.1, qDTY 3.2, qDTY 6.1, and qDTY 12.1) showed an effect against two or more high-yielding genetic backgrounds in both the lowland and upland ecosystem, indicating their usefulness in increasing the grain yield of rice under drought. The yield of popular rice varieties IR64 and Vandana has been successfully improved through a well-planned marker-assisted backcross breeding approach, and QTL introgression in several other popular varieties is in progress. The identification of large-effect QTLs for grain yield under drought and the higher yield increase under drought obtained through the use of these QTLs (which has not been reported in other cereals) indicate that rice, because of its continuous cultivation in two diverse ecosystems (upland, drought tolerant, and lowland, drought susceptible), has benefited from the existence of larger genetic variability than in other cereals. This can be successfully exploited using marker-assisted breeding.
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影响因子：
2.9
作者：
Dixit S;Singh A;Sta Cruz MT;Maturan PT;Amante M;Kumar A
通讯作者：
Kumar A
影响因子：
5.8
作者：
Ghimire, Krishna Hari;Quiatchon, Lenie A.;Kumar, Arvind
通讯作者：
Kumar, Arvind
影响因子：
4.4
作者：
Swamy BP;Vikram P;Dixit S;Ahmed HU;Kumar A
通讯作者：
Kumar A
影响因子：
2.5
作者：
Manly, KF;Cudmore, RH;Meer, JM
通讯作者：
Meer, JM
影响因子：
2.9
作者：
Mishra KK;Vikram P;Yadaw RB;Swamy BP;Dixit S;Cruz MT;Maturan P;Marker S;Kumar A
通讯作者：
Kumar A