Identification and mapping of a QTL (qDTY_1.1) with a consistent effect on grain yield under drought

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• 作者：Krishna Hari Ghimire^a ; ¹ ; ^{ghimirekh@gmail.com} ; Lenie A. Quiatchon^a ; ^b ; Prashant Vikram^b ; ^{p.vikram@irri.org} ; B.P. Mallikarjuna Swamy^b ; ^{m.swamy@irri.org} ; Shalabh Dixit^b ; ^{s.dixit@cgiar.org} ; Helaluddin Ahmed^b ; ^{helaluddinahmed@hotmail.com} ; Jose E. Hernandez^a ; ^{jehernandez@uplb.edu.ph} ; Teresita H. Borromeo^a ; ^{thborromeo@yahoo.com} ; Arvind Kumar^c ; ^b ; ^{akumar@cgiar.org}
• 关键词：DNA ; deoxyribonucleic acid ; QTL ; quantitative trait loci ; LOD ; logarithm of odds ; MAB ; marker-assisted breeding
• 刊名：Field Crops Research
• 出版年：2012
• 期刊代码：44_03784290
• 类别：abs
• 出版时间：13 May, 2012
• 卷：131
• 期：Complete
• 页码：88-96
• 文件大小：975 K

摘要

The identification and introgression of QTLs for grain yield under drought is a preferred breeding strategy to improve the drought tolerance of popular elite rice varieties. Swarna and IR64 are two high-yielding rice varieties widely grown in rainfed areas of South and Southeast Asia but they are highly sensitive to drought. Dhagaddeshi, a traditional drought-tolerant donor, was crossed with Swarna and IR64 to develop two recombinant inbred line populations. The two populations were phenotyped for grain yield under reproductive-stage drought stress and non-stress during DS2010 and DS2011. Bulk segregant analysis was followed to identify the loci linked to grain yield under drought. A major-effect QTL, qDTY_1.1, for grain yield under drought was identified on chromosome 1 between the marker intervals RM431 and RM12091 in both populations. The Dhagaddeshi allele at qDTY_1.1 contributed to increased yield under drought and explained 32.0%and 9.3%of the phenotypic variance and 24.9%and 8.6%additive effect of the trial mean yield in Dhagaddeshi 脳 Swarna and Dhagaddeshi 脳 IR64 populations, respectively. A consistent effect of qDTY_1.1 has also been reported earlier. The presence of qDTY_1.1 in several traditional drought-tolerant donors and its consistent effect across the genetic backgrounds makes it a suitable QTL for use in marker-assisted breeding to improve the grain yield of drought-susceptible rice varieties.