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Published on September 17, 2004; 10.1105/tpc.104.025700

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Received June 30, 2004
Accepted August 12, 2004

Dissection of Maize Kernel Composition and Starch Production by Candidate Gene Association

Larissa M. Wilson 1, Sherry R. Whitt 2, Ana M. Ibáñez 3, Torbert R. Rocheford 4, Major M. Goodman 5, and Edward S. Buckler IV 6*

1 Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695
2 U.S. Department of Agriculture, Agricultural Research Service, Raleigh, North Carolina 27695
3 Department of Food Science and Technology, University of California, Davis, California 95616
4 Department of Crop Sciences, University of Illinois, Urbana, Illinois 61801
5 Department of Crop Science, North Carolina State University, Raleigh, North Carolina 27695
6 U.S. Department of Agriculture, Agricultural Research Service and Department of Plant Breeding, Cornell University, Ithaca, New York 14850

* To whom correspondence should be addressed. E-mail: esb33{at}cornell.edu.

Cereal starch production forms the basis of subsistence for much of the world's human and domesticated animal populations. Starch concentration and composition in the maize (Zea mays ssp mays) kernel are complex traits controlled by many genes. In this study, an association approach was used to evaluate six maize candidate genes involved in kernel starch biosynthesis: amylose extender1 (ae1), brittle endosperm2 (bt2), shrunken1 (sh1), sh2, sugary1, and waxy1. Major kernel composition traits, such as protein, oil, and starch concentration, were assessed as well as important starch composition quality traits, including pasting properties and amylose levels. Overall, bt2, sh1, and sh2 showed significant associations for kernel composition traits, whereas ae1 and sh2 showed significant associations for starch pasting properties. ae1 and sh1 both associated with amylose levels. Additionally, haplotype analysis of sh2 suggested this gene is involved in starch viscosity properties and amylose content. Despite starch concentration being only moderately heritable for this particular panel of diverse maize inbreds, high resolution was achieved when evaluating these starch candidate genes, and diverse alleles for breeding and further molecular analysis were identified.




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