Han Jaeyeong, Locke Steven P, Herman Theresa K, Schroeder Nathan E, Hartman Glen L
Department of Crop Sciences, University of Illinois, Urbana, IL 61801.
USDA-Agricultural Research Service, Urbana, IL, 61801.
J Nematol. 2022 Feb 18;54(1). doi: 10.21307/jofnem-2022-001. eCollection 2022.
Root-knot ( (Kofoid & White) Chitwood), reniform ( Lindford & Oliveira), and lesion nematodes ( (Cobb) Filipjev & Schuurmans Stekhoven) are plant-parasitic nematodes that feed on soybean ( (L.) Merr.) roots, limiting seed production. The availability of resistance in soybeans to these nematodes is limited. However, new sources of resistance can be discovered in wild relatives of agronomic crops. Perennial 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 species were evaluated for their response to and , and eight accessions of six perennial species were evaluated for their response to . Pot experiments were conducted for and in a growth chamber and in vitro experiments were conducted for . We found both shared and distinct interactions along the resistance-susceptible continuum in response to the three plant-parasitic nematode species. Ten and 15 accessions were classified as resistant to based on eggs per gram of root and gall index, respectively. Among them, plant introductions (PIs) 446983 and 339655 had a significantly lower gall index than the resistant soybean check cv. Forrest. Of three resistant accessions identified in this study, PI 441001 showed significantly greater resistance to than the resistant check cv. Forrest based on nematodes per gram of root. In contrast, no resistance to was recorded in any perennial species.
根结线虫（（科福伊德和怀特）奇伍德）、肾形线虫（林德福德和奥利维拉）和根腐线虫（（科布）菲利耶夫和舒尔曼斯·斯特克霍文）是寄生于植物的线虫，以大豆（（林奈）梅里尔）根系为食，限制种子产量。大豆对这些线虫的抗性资源有限。然而，可以在农艺作物的野生近缘种中发现新的抗性来源。多年生物种，大豆的野生近缘种，是有价值的遗传资源来源，具有提高大豆抗病性的潜力。为了确定这些多年生植物是否对线虫有抗性，对来自10个多年生物种的18份种质进行了对[根结线虫和肾形线虫]的反应评估，对来自6个多年生物种的8份种质进行了对[根腐线虫]的反应评估。在生长室中对[根结线虫和肾形线虫]进行了盆栽试验，对[根腐线虫]进行了体外试验。我们发现，在对这三种植物寄生线虫的抗性-感病连续体中，既有共同的相互作用，也有不同的相互作用。分别根据每克根中的卵数和根瘤指数，有10份和15份种质被归类为对[根结线虫]有抗性。其中，植物引种（PI）446983和339655的根瘤指数明显低于抗性大豆对照品种福里斯特。在本研究中鉴定出的3份对[肾形线虫]有抗性的种质中，PI 441001基于每克根中的线虫数，显示出比对[肾形线虫]有抗性的对照品种福里斯特更强的抗性。相比之下，在任何多年生物种中都未记录到对[根腐线虫]的抗性。
