Reaction of genotypes of pigeon pea (Cajanus cajan(L .) Millspaugh) to the root-knot nematode (Meloidogyne enterolobii)

ABSTRACT The eEvaluation of genotypes of pigeon pea genotypes as antagonistic, resistant or tolerant to the root-knot nematodes (Meloidogyne enterolobii), may increase the multipurpose potential of this legume, and verifying the reaction of genotypes reaction to this phytopathogen, considered one of the most aggressive pathogens of the genus, isf necessary due to its wide dissemination and scarcity of control in the national territory. Thus, the objective aim of this studywork was to evaluate the reaction of six genotypes of pigeon pea (Cajanus cajan) to the pathogen M. enterolobii. The final evaluation of the plants occurred 80 days after the inoculation of plant phytopathogens, and the following in which plant development variables were measured: plant height, stem number of stems, weight of root fresh root matter weight and weight of dry matter weight. As well as dDevelopmental variables of the nematode M. enterolobii were also evaluated: gall number of galls, egg mass index, reproduction factor and reproduction factor reduction. The host suitability genotypes of pigeon pea genotypes wasere evaluated based ony means of five classification criteria from different trials. For fodder the production of fodder, three genotypes were moderately resistant to M. enterolobii, FG Sob/14-09, FGg59-95/14-37 and FGCAM/14-49. However, the genotypes of pigeon pea did not fit as antagonistic plants, presenting susceptibility to the phytopathogen.

摘要：对木豆（Cajanus cajan）基因型针对象耳豆根结线虫（Meloidogyne enterolobii）的拮抗、抗病或耐病性进行评价，可提升该豆科植物的多用途潜力。鉴于该植物病原物（phytopathogen）为根结线虫属中侵染性最强的病原之一，且在本国境内传播广泛、防治手段匮乏，验证木豆基因型对该病原的反应十分必要。本研究旨在评价6个木豆基因型对象耳豆根结线虫M. enterolobii的反应。于接种病原物后80天完成植株最终评价，测定的植株生长指标包括株高、茎数、鲜根重及干物质重；同时还评价了象耳豆根结线虫M. enterolobii的发育相关指标：虫瘿数量、卵块指数、繁殖系数及繁殖系数降低率。本研究采用5种不同试验的分类标准对木豆基因型的寄主适应性进行评价。就饲用用途而言，FG Sob/14-09、FGg59-95/14-37及FGCAM/14-49这3个基因型对M. enterolobii表现为中抗。但所有供试木豆基因型均未表现出拮抗作用，均对该植物病原物存在感病性。