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ARS Home » Northeast Area » Ithaca, New York » Robert W. Holley Center for Agriculture & Health » Plant, Soil and Nutrition Research » Research » Publications at this Location » Publication #204147

Title: Elucidating the Molecular Determinants of Aluminum Tolerance in Sorghum and Maize

item Kochian, Leon
item Magalhaes, Jurandir
item Liu, Jiping
item Hoekenga, Owen
item Guimaraes, Claudia
item Alves, Vera
item Maron, Lyza
item Shaff, Jon
item Lyi, Michael
item Schaffert, Robert

Submitted to: Plant and Animal Genome VX Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 1/2/2006
Publication Date: 1/16/2006
Citation: Kochian, L.V., Magalhaes, J., Liu, J., Hoekenga, O., Guimaraes, C., Alves, V., Maron, L., Shaff, J., Lyi, M., Schaffert, R. 2006. Elucidating the Molecular Determinants of Aluminum Tolerance in Sorghum and Maize [abstract]. Plant and Animal Genome VX Conference Abstracts. p. 42.

Interpretive Summary:

Technical Abstract: Aluminum (Al) toxicity on acid soils represents a major constraint for crop production worldwide, thus understanding the genetic and molecular mechanisms of Al tolerance has been a major focus for a number of laboratories. Here, we report on the progress made from our Generation Challenge Program grant on the identification and characterization of Al tolerance genes and associated physiological mechanisms in sorghum and maize. With regards to sorghum Al tolerance, we have cloned via high resolution mapping a candidate Al tolerance gene, AltSB, that is a novel, Al-activated citrate transporter involved in the primary mechanism of sorghum Al tolerance. Evidence will be presented verifying that AltSB is a major sorghum Al tolerance gene. Also, sequence analysis of the parental AltSB alleles and the promoter region from selected members of a sorghum diversity panel, combined with determination of AltSB expression, Al tolerance and root citrate exudation indicates that differences in gene expression are a major determinant of sorghum Al tolerance. This research also has allowed us to identify superior AltSB alleles and work is now underway to use this information to facilitate improvements in sorghum Al tolerance via marker-assisted selection. In maize, we have employed an interdisciplinary approach based on maize root tip gene expression profiling, analysis of maize homologs of the wheat (ALMT1) and sorghum (AltSB) tolerance genes, and knowledge of physiological mechanisms of maize Al tolerance to identify candidate maize Al tolerance genes. Subsequent association and linkage analysis of these candidates has identified a number of putative tolerance genes.