|HAN, JAEYEONG - University Of Illinois|
|LOCKE, STEVEN - University Of Illinois|
|SCHROEDER, NATHAN - University Of Illinois|
Submitted to: Journal of Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/10/2021
Publication Date: 2/18/2022
Citation: Han, J., Locke, S.P., Herman, T.K., Schroeder, N.E., Hartman, G.L. 2022. Evaluation of perennial Glycine species for response to Meloidogyne incognita, Rotylenchulus reniformis, and Pratylenchus penetrans. Journal of Nematology. 54:1-13.
Interpretive Summary: There are a number of plant parasitic nematodes that feed on soybean roots and cause a loss in productivity. These include Root-knot, reniform, and lesion nematodes. Currently, resistance to these nematodes in soybean is either lacking or at risk because of resistance-breaking populations of nematodes. In some crop plants, new sources of resistance can be discovered in wild relatives of agronomic crops. Perennial Glycine species, wild relatives to soybean, have the potential to provide new sources of resistance that may be used to improve disease resistance in soybean. We found that 15 accessions of the perennials were resistant to root-knot nematode, three accessions resistant to reniform nematode, and no accessions resistant to lesion nematode. This is the first extensive report evaluating perennial Glycine species for resistance to three plant parasitic nematodes. This work is important to breeders, biotechnologists, and geneticists that may want to use this material to transfer this resistance into cultivated soybean.
Technical Abstract: Root-knot (Meloidogyne incognita (Kofoid & White) Chitwood), reniform (Rotylenchulus reniformis Lindford & Oliveira), and lesion nematodes (Pratylenchus penetrans (Cobb) Filipjev & Schuurmans Stekhoven) are plant-parasitic nematodes that feed on soybean (Glycine max (L.) Merr.) roots, limiting seed production. Current resistance in soybeans to these nematodes is either lacking or at risk because of resistance-breaking populations of nematodes. However, new sources of resistance can be discovered in wild relatives of agronomic crops. Perennial Glycine species, wild relatives to soybean, are a source of valuable genetic resources with the potential to improve disease resistance in soybean. To determine if these perennials have resistance against nematodes, 18 accessions of 10 perennial Glycine species were evaluated for their response to M. incognita and R. reniformis, and eight accessions of six perennial Glycine species were evaluated for their response to P. penetrans. We found both shared and distinct interactions along the resistance continuum in response to the three plant-parasitic nematode species. Ten and 15 accessions were classified as resistant to M. incognita based on eggs per gram of root and gall index, respectively. Among them, G. tomentella plant introduction (PI) 339655 had a significantly lower gall index than the resistant soybean check cv. Forrest. Of three R. reniformis resistant accessions identified in this study, G. tomentella PI 441001 showed significantly greater resistance to R. reniformis than the resistant check cv. Forrest based on population per gram of root. In contrast, no resistance to P. penetrans was recorded in any perennial Glycine species.