Adamo Noah, Johnson Charles S, Reed T David, Eisenback Jonathan D
Virginia Tech, Southern Piedmont Agricultural Research and Extension Center, 2375 Darvills Rd, Blackstone, VA, 23824.
Virginia Tech, School of Plant and Environmental Sciences, 170 Drillfield Dr, Blacksburg, VA, 24060.
J Nematol. 2021 Jul 19;53. doi: 10.21307/jofnem-2021-064. eCollection 2021.
Chemical controls for root-knot nematodes are increasingly restricted due to environmental and human health concerns. Host resistance to these nematodes is key to flue-cured tobacco production in Virginia. Resistance to races 1 and 3, and race 1 of is imparted by the gene which is widely available in commercial flue-cured tobacco. imparts increased resistance to when stacked with and is becoming commercially available. The efficacy of against race 2, which is increasingly prevalent in Virginia, is unclear. Greenhouse trials were conducted in 2017 to determine how potential resistance derived from compares to the root-knot nematode resistance afforded by and . Trials were arranged in a completely randomized block design and included an entry with traits derived from , a susceptible entry and entries possessing and/or . Data collected after 60 days included percent root galling, egg mass counts, and egg counts. Root galling and reproduction were significantly lower on the entry possessing traits derived from relative to other entries, suggesting that the species may hold a novel source of root-knot nematode resistance for commercial flue-cured tobacco cultivars.
由于环境和人类健康方面的担忧，用于防治根结线虫的化学药剂受到越来越多的限制。寄主对这些线虫的抗性是弗吉尼亚州烤烟生产的关键。对1号和3号生理小种以及1号生理小种的抗性由基因 赋予，该基因在商业烤烟品种中广泛存在。当与 堆叠时， 赋予对 的增强抗性，并且正在商业化。 对在弗吉尼亚州日益普遍的2号生理小种的防治效果尚不清楚。2017年进行了温室试验，以确定源自 的潜在抗性与 和 提供的根结线虫抗性相比如何。试验采用完全随机区组设计，包括一个具有源自 性状的品系、一个感病品系以及具有 和/或 的品系。60天后收集的数据包括根瘤百分比、卵块计数和卵计数。相对于其他品系，具有源自 性状的品系上的根瘤和繁殖显著降低，这表明 物种可能为商业烤烟品种提供一种新的根结线虫抗性来源。
