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United States Department of Agriculture

Agricultural Research Service

Research Project: GENOMIC APPROACHES TO IMPROVING TRANSPORT AND DETOXIFICATION OF SELECTED MINERAL ELEMENTS IN CROP PLANTS

Location: Plant, Soil and Nutrition Research

Title: Joint linkage-association analysis of aluminum tolerance in maize

Authors
item Hoekenga, Owen
item Buckler, Edward
item Maron, Lyza - CORNELL UNIVERSITY
item Magalhaes, Jurandir - EMBRAPA
item Kirst, Matias - UNIV. OF FLORIDA
item Krill, Allison - CORNELL UNIVERSITY
item Lyi, Michael - CORNELL UNIVERSITY
item Rose, Jocelyn - CORNELL UNIVERSITY
item Thannhauser, Theodore
item Kochian, Leon

Submitted to: Plant and Animal Genome VX Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: December 11, 2006
Publication Date: January 13, 2007
Citation: Hoekenga, O., Buckler Iv, E.S., Maron, L., Magalhaes, J., Kirst, M., Krill, A., Lyi, M., Rose, J., Thannhauser, T.W., Kochian, L.V. 2007. Joint linkage-association analysis of aluminum tolerance in maize [abstract]. Plant and Animal Genome VX Conference Abstracts. p. 55.

Technical Abstract: Aluminum (Al) toxicity is a profound limitation to crop production worldwide, reducing yields on up to 50% of potentially arable lands. Breeding for Al tolerance and agronomic practices aimed at ameliorating soil acidity have historically been productive avenues for improved crop production. However, it is widely recognized that additional improvements in crop Al tolerance will depend on biotechnology. We undertook an experimental plan integrating statistical genetic, genomic and proteomic approaches, building upon our previous work on the genetic and physiological bases for Al tolerance in maize. We identified 6 Al tolerance QTL in the Intermated B73 x Mo17 (IBM) recombinant inbred population, which together explain nearly 65% of the variance observed. Al exclusion from the root tip correlates highly with Al tolerance as estimated by root growth. We used microarray analysis to characterize the root tip transcriptome, together with a limited use of proteomics to validate the gene expression work. The results of the microarray experiments have been analyzed with respect to the physical and genetic maps of maize and in a comparative sense with the rice genome. Based on all of these experiments, we selected candidate Al tolerance genes to evaluate using association analysis. We identified several single nucleotide polymorphisms in multiple genes that are associated with Al tolerance. The significance of these results and of this approach will be discussed. NSF Plant Genome Award DBI #0419435, a CGIAR Generation Challenge grant, a McKnight Foundation Collaborative Crop Research Program and USDA-ARS base funds support this work.

Last Modified: 4/24/2014
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