Tracking the R
Mc1
Gene for Resistance to Race 1 of Columbia Root-Knot Nematode (Meloidogyne chitwoodi) in Three Mexican Wild Potato Species with Different Ploidies |
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| Authors: | Charles R Brown Linhai Zhang Hassan Mojtahedi |
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| Institution: | 1. USDA/ARS, Washington, DC, USA
2. Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Rd., Prosser, WA, USA
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| Abstract: | Resistance to Columbia Root-knot nematode was discovered in three wild species in a polyploidy series, Solanum bulbocastanum (2n?=?2x), .S. fendleri (2n?=?4x), and S. hougasii, 2n?=?6x, respectively. After several generations of introgression into the cultivated gene pool, a single dominant monogene conditioning resistance to root propagation of race 1 of CRKN was theorized to be acting in breeding lines derived from each species. Coincidently, sequence tagged sites (STS) and cleaved amplified polymorphic site (CAPS) markers that associated with resistance with S. bulbocastanum were found to be informative in other segregating breeding populations regardless of the source of the gene. The utility of the markers across ploidies suggests that the original gene and genome of S. bulbocastanum or a modern derivative, is present in S. fendleri and S. hougasii. In this polyploidy series, knowledge that the S. bulbocastanum genome is the original source of useful genes guides future germplasm surveyors to search first and most intensively in the primitive Mexican diploid species that may have served as the contributor of a genome to descendants harboring this genome at higher ploidies. |
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