Comparative Transcriptomic Analysis of Soybean Cyst Nematode Inbred Populations Non-adapted or Adapted on Soybean rhg1-a/Rhg4-Mediated Resistance
Date
2024-10-04
Authors
Kwon, Khee Man
Masonbrink, Rick E.
Maier, Thomas R.
Gardner, Michael N.
Mitchum, Melissa G.
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American Phytopathological Society (APS)
Abstract
Soybean cyst nematode (SCN, Heterodera glycines) is most effectively managed through planting resistant soybean cultivars, but the repeated use of the same resistance sources has led to a widespread emergence of virulent SCN populations that can overcome soybean resistance. Resistance to SCN HG type 0 (Race 3) in soybean cultivar Forrest is mediated by an epistatic interaction between the soybean resistance genes rhg1-a and Rhg4. We previously developed two SCN inbred populations by mass-selecting SCN HG type 0 (Race 3) on susceptible and resistant recombinant inbred lines, derived from a cross between Forrest and the SCN-susceptible cultivar Essex, which differ for Rhg4. To identify SCN genes potentially involved in overcoming rhg1-a/Rhg4-mediated resistance, we conducted RNA sequencing on early parasitic juveniles of these two SCN inbred populations infecting their respective hosts, only to discover a handful of differentially expressed genes (DEGs). However, in a comparison with early parasitic juveniles of an avirulent SCN inbred population infecting a resistant host, we discovered 59 and 171 DEGs uniquely up- or downregulated in virulent parasitic juveniles adapted on the resistant host. Interestingly, the proteins coded by these 59 DEGs included vitamin B-associated proteins (reduced folate carrier, biotin synthase, and thiamine transporter) and nematode effectors known to play roles in plant defense suppression, suggesting that virulent SCN may exert a heightened transcriptional response to cope with enhanced plant defenses and an altered nutritional status of a resistant soybean host.
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This article is published as Kwon, Khee Man, Rick E. Masonbrink, Thomas R. Maier, Michael N. Gardner, Andrew J. Severin, Thomas J. Baum, and Melissa G. Mitchum. "Comparative transcriptomic analysis of soybean cyst nematode inbred populations non-adapted or adapted on soybean rhg1-a/Rhg4-mediated resistance." Phytopathology® (2024): PHYTO-03.
doi: https://doi.org/10.1094/PHYTO-03-24-0095-R.
Rights Statement
Copyright © 2024 The Author(s). This is an open access article
distributed under the CC BY-NC-ND 4.0 International license.