Survival of Pratylenchus brachyurus under dry soil conditions

Abstract

Pratylenchus brachyurus , a root-lesion nematode, depends on host plants for growth and survival. Weeds, volunteer plants, and crop root residues may act as reservoirs for the parasite in the field, but little is known about the ability of P. brachyurus to survive in the absence of a host. This study aimed to evaluate P. brachyurus survival and infectivity in artificially and naturally infested soil under dry conditions. Two experiments were conducted, the first using artificially infested soil and the second using naturally infested soil. Soil samples were inoculated with a nematode suspension or infected root fragments. At 0, 30, 60, and 90 days post-inoculation, pots were planted with nematode-susceptible maize and soybean. Fallow pots were also analyzed. Nematode survival, infectivity, and morphology were determined 30 days after planting. P. brachyurus showed enhanced survival in soil in the presence of root fragments. However, inoculation method had no effect on the ability of surviving nematodes to infect host roots. Parasites showed signs of anhydrobiosis (C-shaped or tightly coiled body) after 90 and 120 days under dry conditions.

Plant-Parasitic Nematodes and Their Management: A Focus on New Nematicides

“…Unlike J4, which is resilient, the other forms of the parasite are sensitive to changes in soil moisture. Eggs, on the other hand, survive changes better than motile forms of the parasite [85]. In addition to withstanding dry soil, these can also survive freezing as anhydrobionts.…”

“…The loss of water from their bodies reduces the formation of ice needles that can pierce internal organ cells [86]. Although the reproductive capacity is not affected by anhydrobiosis, the reserve lipid content is managed differently during this stage, since it has been shown that lipid consumption is higher in females than in males [85,87].…”

Evaluating the Influence of Water Scarcity on the Host Response of Garlic to the Stem and Bulb Nematode Ditylenchus dipsaci

“…Previous works have studied how water stress affects the host response in different crops to plant-parasitic nematodes, such as Meloidogyne [40][41][42][43], Heterodera [44], and Praty-lenchus [41,45]. These studies have shown how water stress is, in most cases, a relevant factor in reducing the general development of plants, also negatively affecting nematode reproduction.…”

Comportamento de diferentes espécies de adubos verdes para o manejo de >i<Pratylenchus brachyurus>/i<

“…Entrar em estado de dormência, anidrobiose, é outra forma de sobrevivência do nematoide em condições adversas (Perry;Moens, 2006). Ribeiro et al (2020) conduziram estudos com intuito de analisar a capacidade de sobrevivência de P. brachyurus em condições de solo seco e, observaram que a permanência de raízes no campo favoreceu a multiplicação do patógeno comparado a solos sem hospedeiros, além de manter a sua infectividade por cerca de 90 dias.…”