Identification of SSR markers associated with height using pool-based genome-wide association mapping in sorghum

Wang, Y and Bible, P and Loganantharaj, R and Upadhyaya, H D (2012) Identification of SSR markers associated with height using pool-based genome-wide association mapping in sorghum. Molecular Breeding, 30 (1). pp. 281-292. ISSN 1572-9788

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Abstract

Sorghum has been proposed as a potential energy crop. However, it has been traditionally bred for grain yield and forage quality, not traits related to bioenergy production. To develop tools for genetic improvement of bioenergy-related traits such as height, genetic markers associated with these traits have first to be identified. Association mapping has been extensively used in humans and in some crop plants for this purpose. However, genome-wide association mapping using the whole association panel is costly and time-consuming. A variation of this method called pool-based genome-wide association mapping has been extensively used in humans. In this variation, pools of individuals with contrasting phenotypes, instead of the whole panel, are screened with genetic markers and polymorphic markers are confirmed by screening the individuals in the pools. Here, we identified several new simple sequence repeats (SSR) markers associated with height using this pool-based genome-wide association mapping in sorghum. After screening the tall and short pools of sorghum accessions from the sorghum Mini Core collection developed at the International Crops Research Institute for the Semi-Arid Tropics with 703 SSR markers, we have identified four markers that are closely associated with sorghum height on chromosomes 2, 6, and 9. Comparison with published maps indicates that all four markers are clustered with markers previously mapped to height or height-related traits and with candidate genes involved in regulating plant height such as FtsZ, Ugt, and GA 2-oxidase. The mapping method can be applied to other crop plants for which a high-throughput genome-wide association mapping platform is not yet available.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Sorghum, Pool-based genome-wide association mapping, SSR markers, Molecular breeding, Height
Subjects:	Mandate crops > Sorghum
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	18 Nov 2011 05:43
Last Modified:	18 Feb 2013 05:50
URI:	http://oar.icrisat.org/id/eprint/4067
Official URL:	http://dx.doi.org/10.1007/s11032-011-9617-3
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	This work was supported by the University of Louisiana at Lafayette. We thank Jonathan A. Groomer, Chuanqin Xu and William H. Welsh for technical assistance.
Links:	Author

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