Plant-parasitic nematodes (ppns) are significant agricultural pests that cause annual losses estimated at around $10 billion in the united states and over $100 billion on the global scale due to…

The Department of Agriculture National Institute of Food and Agriculture awarded $298,913 to the Division of Agriculture of the University of Arkansas on February 1, 2026, under the Agriculture and Food Research Initiative (AFRI, CFDA 10.310) to investigate the molecular mechanisms by which soybean cyst nematodes manipulate physiological processes in soybean root host plants and to identify vulnerabilities in the nematode life cycle that can be exploited for control strategies.

The research focuses on elucidating the biological significance of soybean cyst nematode effector proteins during feeding site establishment in soybean roots and nematode development. The work addresses the economic impact of plant-parasitic nematodes, which cause estimated annual losses exceeding $1 billion in U.S. soybean production alone. Host resistance remains the most environmentally and economically sustainable control method, but limited resistance sources and selection pressure from repetitive use drive the need for new nematode management strategies.

Performance occurs in Fayetteville, Arkansas. The period of performance runs from February 1, 2026, through January 31, 2028. The award is a Project Grant, classified as assistance funding.

Plant-parasitic nematodes (ppns) are significant agricultural pests that cause annual losses estimated at around $10 billion in the united states and over $100 billion on the global scale due to crop damage. Most of the harm is inflicted by a small group of root-infecting sedentary endoparasites nematodes, including cyst nematodes and root-knot nematodes which develop long and complex biotrophic relationships with their plant host. In soybean production, the soybean cyst nematode (heterodera glycines; SCN) is the primary cause of disease-related yield losses, with annual damage estimated at over $1 billion, making IT the most economically impactful pathogen affecting this important crop. With the general toxicity of nematicides and challenges associated with suboptimal climatic conditions for soil solarization, as well as inconsistent results for the application of microbial biocontrol agents, host resistance is the most environmentally and economically friendly method to combat ppns. However, limited sources of resistance have been found across various crops and repetitive use of resistance, without appropriate crop rotation, can lead to selection pressure on nematode populations and an increase in the number of virulent individuals. In light of these limitations, there is an urgent need to develop new nematode control strategies. The overarching goal of our program is to understand the molecular basis by which the cyst nematodes manipulate the physiological processes of host plants and therefore uncover vulnerabilities in the nematode's life cycle that can be exploited for effective control strategies, ultimately contributing to the development of sustainable solutions for managing plant-parasitic nematodes in agriculture. Particularly, our research focuses on elucidating the biological significance of SCN effectors during establishment of the feeding site in soybean roots and nematode development. While numerous nematode effector proteins have been implicated in manipulating host pathways to facilitate feeding site development, the majority of research has focused on effectors suppressing plant immunity. This study aims to shift the focus towards late-phase effectors that actively facilitate nematode development/reproduction and are predicted to play a role in the metabolism. As an alternative to use of typical resistance genes, our project focuses on a promising approach for nematode management which involves reducing plant susceptibility by inactivating plant genes/pathways essential for nematode development, thereby preventing nematodes from completing their life cycle.using a unique approach of proteomic analysis of nematode feeding sites, we have identified 180 cyst nematode effectors directly injected into host tissues to facilitate parasitism, the vast majority of which have not been characterized yet. By applying a set of filters and bioinformatics, we selected two feeding site-specific effectors (HGSPE1 and HGSPE2) from SCN for FUR, ther characterization, with at least one of them predicted to potentially play a role in the neamtode metabolism and development. To identify the mechanistic basis by which SCN manipulates host physiological processes for successful reproduction and to identify the host susceptibility genes that are essential for successful nematode infection, we propose three research objectives: OBJ. 1. Determine the subcellular localization of HGSPE1 and HGSPE2 in host cells and investigate their expression pattern in nematodes. OBJ. 2. Examine the importance of HGSPE1 and HGSPE2 in cyst nematode virulence. OBJ. 3. Identify host proteins physically interacting with HGSPE1 and HGSPE2. This research project aims to preliminarily characterize HGSPE1 and HGSPE2, as well as identify host protein targets, with a future goal of biotechnologically 'redesign' these targets to inhibit their binding by hgspes without compromising their endogenous functions. This project's outcomes will fill critical gaps in our fundamental understanding of molecular nematode-host interactions and, more importantly, will generate valuable knowledge resources to guide the development of novel SCN-resistant soybean lines, thus, helping growers avoid millions of dollars in otherwise unrealized yield losses. The mechanisms underlying fundamental biological processes such as susceptibility to nematodes are often conserved in plants, thus making IT possible to translate our discoveries in one plant species to other species. Such conservation can be utilized in several ways, including the identification of candidate homologs in other crop plants, exploiting natural variation in candidate genes across various crops, and developing transgenic strategies using these candidate genes.