Shift in Virulence of Soybean Cyst Nematode is Associated with Use of Resistance from PI 88788

Niblack, T. L.; Colgrove, A. L.; Colgrove, K.; Bond, Jason P.

doi:10.1094/php-2008-0118-01-rs

Cited by 124 publications

(96 citation statements)

References 6 publications

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“…Field SCN populations evolve slowly, but are increasingly exhibiting partial virulence on plants expressing PI 88788-derived Rhg1 (23,24). Understanding the molecular mechanisms of Rhg1-mediated SCN resistance may allow quantitative improvements to Rhg1 resistance through allele diversification, the generation of synthetic improved resistance, and/ or transfer of the widely successful Rhg1-mediated resistance mechanism to other crops, such as wheat or potato.…”

Section: Significancementioning

confidence: 99%

Disease resistance through impairment of α-SNAP–NSF interaction and vesicular trafficking by soybean Rhg1

Bayless

Smith

Song

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

154

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α-SNAP [soluble NSF (N-ethylmaleimide–sensitive factor) attachment protein] and NSF proteins are conserved across eukaryotes and sustain cellular vesicle trafficking by mediating disassembly and reuse of SNARE protein complexes, which facilitate fusion of vesicles to target membranes. However, certain haplotypes of the Rhg1 (resistance to Heterodera glycines 1) locus of soybean possess multiple repeat copies of an α-SNAP gene (Glyma.18G022500) that encodes atypical amino acids at a highly conserved functional site. These Rhg1 loci mediate resistance to soybean cyst nematode (SCN; H. glycines), the most economically damaging pathogen of soybeans worldwide. Rhg1 is widely used in agriculture, but the mechanisms of Rhg1 disease resistance have remained unclear. In the present study, we found that the resistance-type Rhg1 α-SNAP is defective in interaction with NSF. Elevated in planta expression of resistance-type Rhg1 α-SNAPs depleted the abundance of SNARE-recycling 20S complexes, disrupted vesicle trafficking, induced elevated abundance of NSF, and caused cytotoxicity. Soybean, due to ancient genome duplication events, carries other loci that encode canonical (wild-type) α-SNAPs. Expression of these α-SNAPs counteracted the cytotoxicity of resistance-type Rhg1 α-SNAPs. For successful growth and reproduction, SCN dramatically reprograms a set of plant root cells and must sustain this sedentary feeding site for 2–4 weeks. Immunoblots and electron microscopy immunolocalization revealed that resistance-type α-SNAPs specifically hyperaccumulate relative to wild-type α-SNAPs at the nematode feeding site, promoting the demise of this biotrophic interface. The paradigm of disease resistance through a dysfunctional variant of an essential gene may be applicable to other plant–pathogen interactions.

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Section: Significancementioning

confidence: 99%

Disease resistance through impairment of α-SNAP–NSF interaction and vesicular trafficking by soybean Rhg1

Bayless

Smith

Song

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

154

View full text Add to dashboard Cite

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“…8). Pathogenicity of the nematode is highly variable and a number of pathotypes have been identified based on their ability to reproduce on a set of soybean differentials (Niblack et al 2008;Niblack and Riggs 2004). During the growing season, soybean cyst nematodes reproduce up to four generations in warmer climates and as few as two in cooler climates.…”

Section: Soybean Cystmentioning

confidence: 99%

Crops that feed the World 2. Soybean—worldwide production, use, and constraints caused by pathogens and pests

2011

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“…The most effective methods to manage SCN are to use host resistance and to rotate with non-host crops (Niblack and Chen, 2004). As a likely consequence of the abundant use of a single source of resistance, Niblack et al (2008) found that 70% of the SCN-infested soil samples collected in Illinois had populations that could reproduce on PI 88788. Furthermore, resistance has been bred into cultivars; however, PI 88788 is the predominate source of SCN resistance for cultivars available to growers in the northern United States.…”

Section: Impact Of Soybean Cyst Nematode Resistance On Soybean Yieldmentioning

confidence: 99%

Impact of Soybean Cyst Nematode Resistance on Soybean Yield

2017

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Soybean cyst nematode (SCN) (Heterodera glycines Ichinohe) of soybean [Glycine max (L.) Merr.] causes extensive yield loss, and host resistance has been an effective strategy to minimize this loss. However, shifts in SCN population virulence compatibility have resulted from the extensive use of PI 88788 as a source of resistance in the northern United States. The Northern Regional Soybean Cyst Nematode Tests offer a vast amount of yield testing, combined with resistance screening of entries and the characterization of the SCN infection of test fields. The objectives of this study were to use regional test results (i) to quantify the impact of resistance as the initial field SCN egg counts increase, (ii) to explore effects of maturity group (MG) on resistance, and (iii) to gain insights into how the ability of SCN to infect germplasm with resistance from PI 88788 affects yield. Yield tests across 11 yr were combined into a single dataset with over 1247 test–environment combinations. Analysis of these data showed that the yield advantage of SCN resistant entries increased as initial egg counts increased, and a larger advantage was found in early MGs (00–II) than in later MGs (III–IV). A yield advantage was documented at environments with an initial egg count as low as 100 eggs 100 cm−3 soil. At the levels of SCN infection on PI 88788 found in infested locations, breeding lines with resistance from PI 88788 yielded more than susceptible entries. Analysis of this dataset offers a unique view of the impact SCN resistance provides to soybean.

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Shift in Virulence of Soybean Cyst Nematode is Associated with Use of Resistance from PI 88788

Cited by 124 publications

References 6 publications

Disease resistance through impairment of α-SNAP–NSF interaction and vesicular trafficking by soybean Rhg1

Disease resistance through impairment of α-SNAP–NSF interaction and vesicular trafficking by soybean Rhg1

Crops that feed the World 2. Soybean—worldwide production, use, and constraints caused by pathogens and pests

Impact of Soybean Cyst Nematode Resistance on Soybean Yield

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