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United States Department of Agriculture

Agricultural Research Service

Research Project: IMPROVING GRAIN YIELD ON ACID SOILS BY THE IDENTIFICATION OF GENETIC FACTORS UNDERLYING DROUGHT AND ALUMINUM TOLERANCE IN MAIZE AND SORGHUM

Location: Plant, Soil and Nutrition Research

2010 Annual Report


1a.Objectives (from AD-416)
Develop a whole genome association platform for sorghum and identify SNP markers associated with aluminum tolerance. Identify polymorphisms associated with Al tolerance in maize. Develop innovative methods for analysis of root architecture and the role it plays in acid soil tolerance. Determine the genetic architecture of high Al tolerance in maize based on previously identified Al tolerance QTL and orthology to sorghum AltSB. Improve Al tolerance in maize by introgressing AltSB homologs co-localized with Al tolerance QTLs as well as other Al tolerance QTLs into maize tropical breeding lines. Assess the yield advantage of Al tolerant maize in Kenyan environments and begin to investigate the contribution of Al tolerance to drought tolerance.


1b.Approach (from AD-416)
We will use a combination of association and QTL mapping to identify and verify novel sorghum and maize Al tolerance genes, and use marker assisted breeding to introgress the best alleles of these genes into maize and sorghum for generating cereal crops better suited for cultivation on acidic, Al toxic soils.


3.Progress Report

In 2010, progress on this agreement involved work on sorghum drought tolerance. With regards to drought tolerance in sorghum, we completed the second year of genetic mapping of drought tolerance in the field under well watered and drought conditions. This research identified specific regions of the sorghum genome that contain genes that confer the ability for sorghum to have improved yields under conditions of drought. These findings may lead to the identification of genetic markers that can be used to improve sorghum drought tolerance through molecular breeding.

Research conducted under this agreement was monitored via regular teleconferences, emails, and several meetings between the ADODR and the other cooperators on this grant proposal.


Last Modified: 8/21/2014
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