qDTY1.1 , a major QTL for rice grain yield under reproductive-stage drought stress with a consistent effect in multiple elite genetic backgrounds

BMC Genetics

Research Article

Ma Teresa Sta Cruz¹  Arvind Kumar¹  BP Mallikarjuna Swamy¹  Shalabh Dixit¹  Helal Uddin Ahmed¹  Prashant Vikram²  Alok Kumar Singh³ 

[1] International Rice Research Institute (IRRI), DAPO Box 7777, Metro Manila, Philippines;International Rice Research Institute (IRRI), DAPO Box 7777, Metro Manila, Philippines;V.B.S. Purvanchal University, Jaunpur, India;V.B.S. Purvanchal University, Jaunpur, India;

关键词: Grain Yield;    International Rice Research Institute;    Polymorphic Simple Sequence Repeat Marker;    Pretilachlor;    Rainfed Upland;   

DOI  :  10.1186/1471-2156-12-89

 received in 2011-04-21, accepted in 2011-10-18,  发布年份 2011

来源: Springer

【 摘 要 】

BackgroundDrought is one of the most important abiotic stresses causing drastic reductions in yield in rainfed rice environments. The suitability of grain yield (GY) under drought as a selection criterion has been reported in the past few years. Most of the quantitative trait loci (QTLs) for GY under drought in rice reported so far has been in the background of low-yielding susceptible varieties. Such QTLs have not shown a similar effect in multiple high- yielding drought-susceptible varieties, thus limiting their use in marker-assisted selection. Genetic control of GY under reproductive-stage drought stress (RS) in elite genetic backgrounds was studied in three F3:4 mapping populations derived from crosses of N22, a drought-tolerant aus cultivar, with Swarna, IR64, and MTU1010, three high-yielding popular mega-varieties, with the aim to identify QTLs for GY under RS that show a consistent effect in multiple elite genetic backgrounds. Three populations were phenotyped under RS in the dry seasons (DS) of 2009 and 2010 at IRRI. For genotyping, whole-genome scans for N22/MTU1010 and bulked segregant analysis for N22/Swarna and N22/IR64 were employed using SSR markers.ResultsA major QTL for GY under RS, qDTY1.1 , was identified on rice chromosome 1 flanked by RM11943 and RM431 in all three populations. In combined analysis over two years, qDTY1.1showed an additive effect of 29.3%, 24.3%, and 16.1% of mean yield in N22/Swarna, N22/IR64, and N22/MTU1010, respectively, under RS. qDTY1.1also showed a positive effect on GY in non-stress (NS) situations in N22/Swarna, N22/IR64 over both years, and N22/MTU1010 in DS2009.ConclusionsThis is the first reported QTL in rice with a major and consistent effect in multiple elite genetic backgrounds under both RS and NS situations. Consistency of the QTL effect across different genetic backgrounds makes it a suitable candidate for use in marker-assisted breeding.

【 授权许可】

Unknown   
© Vikram et al; licensee BioMed Central Ltd. 2011. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.