Skip to main content
ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #330695
Title: Putatively novel sources of resistance to soybean cyst nematode

Author
item TRAN, DUNG - University Of Georgia
item NOE, JIM - University Of Georgia
item Arelli, Prakash
item LI, ZENGLU - University Of Georgia

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 7/10/2016
Publication Date: 7/21/2016
Citation: Tran, D., Noe, J., Arelli, P.R., Li, Z. 2016. Putatively novel sources of resistance to soybean cyst nematode. Meeting Abstract. Proceedings of 16th Biennial Molecular&Cellular Biology of the Soybean Conf.2016)pg163 Ohio St.Univ.

Interpretive Summary:

Technical Abstract: Soybean cyst nematode (SCN) remains to be the most economically devastating endo-root parasite of soybean [Glycine max L. (Merrill)], in the USA and worldwide. Currently, two resistance loci, rhg1 and Rhg4 have been the main sources of resistance to SCN. Over 95% of soybean cultivars with SCN resistance planted in the U.S. soybean production have derived their resistance from two genetic sources: Peking and/or PI 88788. Over time, genetically diverse nematode populations adapt to reproduce on resistant cultivars. This is a major challenge to soybean breeders. It is essential to identify new sources of resistance before the nematodes develop immunity to these two resistance sources. To identify new sources of resistance, we have genotyped 96 accessions, breeding lines and controls from various origins using the functional markers that we developed at rhg1 and Rhg4 loci as well as the functional marker for root-knot nematode resistance. These lines are also evaluated for SCN resistance using a greenhouse bioassay. The greenhouse phenotyping results were consistent with the maker prediction. Of 96 lines, we have evaluated 47 lines were classified as carrying Peking type of resistance through rhg1 and Rhg4 loci, while 27 lines classified as PI88788 type resistance with rhg1 allele. Five lines rated as SCN resistance in greenhouse phenotyping did not carry either Peking or PI 88788 resistance alleles at rhg1 and Rhg4 loci. Based on haplotype analysis at the rhg1 and rhg4 loci assembled with Soy50kSNP Infinium Chip data, these lines were also grouped separately from PI 88788 and Peking types. The results strongly indicate that these five lines potentially may have novel SCN resistance genes. Bi-parental populations have been developed and will be used to confirm these novel SCN resistance sources. These novel sources can be used to produce soybean cultivars with durable resistance for sustainable production. Soybean growers will be the ultimate beneficiaries.