State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, Heilongjiang 150081, China.
Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China.
Plant Dis. 2024 Oct;108(10):2968-2975. doi: 10.1094/PDIS-02-24-0442-SR. Epub 2024 Oct 2.
Soybean cyst nematode (SCN), , poses a significant threat to global soybean production. Heilongjiang, the largest soybean-producing province in China, contributes more than 40% to the country's total yield. This province has much longer history of SCN infestation. To assess the current situation in Heilongjiang, we conducted a survey to determine the SCN population density and virulence phenotypes during 2021 to 2022 and compared the data with a previous study in 2015. A total of 377 soil samples from 48 counties representing 11 major soybean-planting regions were collected. The prevalence of SCN increased from 55.4% in 2015 to 59% in the current survey. The population densities ranged from 80 to 26,700 eggs and juveniles per 100 cm of soil. Virulence phenotypes were evaluated for 60 representative SCN populations using the . (HG) type test, revealing nine different HG types. The most common virulence phenotypes were HG types 7 and 0, accounting for 56.7 and 20% of all SCN populations, respectively. The prevalence of populations with a female index (FI) greater than 10% on PI 548316 increased from 64.5% in 2015 to 71.7%. However, the FI on the commonly used resistance sources PI 548402 (Peking) and PI 437654 remained low at 3.3%. These findings highlight the increasing prevalence and changing virulence phenotypes of SCN in Heilongjiang. They also emphasize the importance of rotating soybean varieties with different resistance sources and urgently identifying new sources of resistance to combat SCN.
大豆胞囊线虫（SCN）对全球大豆生产构成重大威胁。中国最大的大豆生产省黑龙江省的大豆产量占全国总产量的 40%以上。该省的 SCN 感染历史更长。为了评估黑龙江省的现状，我们在 2021 年至 2022 年期间进行了一项调查，以确定 SCN 种群密度和毒力表型，并将数据与 2015 年的先前研究进行了比较。共采集了来自代表 11 个主要大豆种植区的 48 个县的 377 个土壤样本。SCN 的患病率从 2015 年的 55.4%上升到目前调查的 59%。种群密度范围从每 100 厘米土壤中的 80 到 26700 个卵和幼虫不等。使用. (HG) 型测试对 60 个有代表性的 SCN 种群进行了毒力表型评估，共发现 9 种不同的 HG 型。最常见的毒力表型是 HG 型 7 和 0，分别占所有 SCN 种群的 56.7%和 20%。PI 548316 上雌性指数（FI）大于 10%的种群的患病率从 2015 年的 64.5%上升到 71.7%。然而，在常用抗性源 PI 548402（北京）和 PI 437654 上的 FI 仍然很低，分别为 3.3%。这些发现突显了 SCN 在黑龙江省的流行率不断增加和毒力表型不断变化的情况。它们还强调了轮作具有不同抗性源的大豆品种的重要性，并迫切需要鉴定新的抗性来源以对抗 SCN。
