Chromosome and chromosomal arm locations of genes for resistance to Septoria glume blotch in wheat cultivar Cotipora |
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Authors: | Xueyi Hu Dwight Bostwick Hari Sharma Herbert Ohm Gregory Shaner |
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Institution: | (1) Department of Agronomy, Purdue University, 47907 West Lafayette, IN, U.S.A.;(2) Department of Botany and Plant Pathology, Purdue University, 47907 West Lafayette, IN, U.S.A.;(3) Present address: CIMMYT, Int., Lasbo, Mexico, DF, Mexico;(4) Present address: Ciba Seeds, 1001 Montana Street, 51443 Glidden, IA, U.S.A. |
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Abstract: | Summary
Septoria glume blotch, caused by Stagonospora nodorum, is an important disease of wheat (Triticum aestivum). Separate genetic mechanisms were found to control flag leaf and spike resistance. Genes for resistance to S. nodorum were located on different chromosomes in the few wheat cultivars studied. These studies only partially agree on the chromosome locations of gene in wheat for resistance to S. nodorum, and chromosomal arm locations of such genes are not known. The objectives of this study were to determine the chromosome and chromosomal arm locations of genes that significantly influence resistance to S. nodorum in wheat cultivar Cotipora. Monosomic analysis showed that flag leaf resistance was controlled by genes on chromosomes 3A, 4A, and 3B whereas the spike resistance was controlled by genes on chromosomes 3A, 4A, 7A, and 3B (P=0.01). Additionally, genes on chromosomes 6B and 5A influenced the susceptibility of the flag leaf and spike reactions, respectively (P=0.01). Telocentric analysis showed that genes on both arms of chromosome 3A, and the long arms of chromosomes 4A and 3B were involved in the flag leaf resistance whereas genes on both arms of chromosome 4A, the short arm of chromosome 3A, and the long arm of chromosome 3B conferred spike resistance. |
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Keywords: | chromosomal arm location chromosome location ditelosomic analysis monosomic analysis Septoria glume blotch Stagonospora nodorum Triticum aestivum wheat |
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