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United States Department of Agriculture

Agricultural Research Service

Title: Transgressive Segregation and the Role of Organic Acid Release in Aluminum Tolerance in a Maize Recombinant Inbred Population Derived from Aluminum Sensitive North American Inbred Lines

item Hoekenga, Owen - BTI
item Kochian, Leon

Submitted to: American Society of Plant Biologists Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: February 1, 2006
Publication Date: July 1, 2006
Citation: Mason, P., Hoekenga, O., Shaff, J., Kochian, L.V. 2006. Transgressive segregation and the role of organic acid release in aluminum tolerance in a maize recombinant inbred population derived from aluminum sensitive north american inbred lines [abstract]. American Society of Plant Biologists Annual Meeting. p.97.

Technical Abstract: Aluminum (Al) toxicity is a global problem limiting agricultural yields on acid soils. Al tolerance in maize is genetically complex. Al-activated root tip citrate exudation is a well-characterized Al tolerance mechanism in maize, but does not completely explain the observed range of Al tolerance when a number of maize genotypes are compared. In this study, a quantitative genetic analysis of Al tolerance in the intermated B73 x Mo17 (IBM) population revealed five genomic locations important for Al tolerance. Three of these QTL combine to explain 42% of variation in tolerance. Mo17 contributes the superior allele at three of the five genomic locations. Because Mo17 has much higher rates of Al-induced citrate release, the two QTL at which B73 contributes the superior allele may confer Al tolerance through novel mechanisms not associated with Al-activated organic acid exudation. Currently, we are studying the genetics of organic acid exudation and Al exclusion in this population.

Last Modified: 4/21/2015