Avaliação de linhagens, híbridos F1 e cultivares de pimentão quanto à resistência a Meloidogyne spp.

Abstract

RESUMO -Com o objetivo de avaliar híbridos F 1 de pimentão, juntamente com suas linhagens progenitoras e cultivares, quanto à resistência a Meloidogyne incognita (raças 1, 2, 3 e 4) e a M. javanica, foi instalado um experimento em casa de vegetação nas dependências da Pioneer Sementes Ltda, em Ijaci, MG. Foi utilizado o delineamento de blocos casualizados, em esquema de parcela subdividida, com cinco parcelas (compostas pelas quatro raças de M. incognita e mais a espécie M. javanica) e 48 subparcelas (compostas por 47 genótipos de pimentão e mais uma cultivar de tomate (Ângela Gigante I-5100), usada como testemunha padrão). Foram usadas cinco repetições e oito plantas em cada subparcela. A inoculação foi feita na concentração de 60 ovos/mL de substrato à base de vermiculita e casca de Pinus sp. (50%) e casca de arroz carbonizada (50%). Sessenta dias após a inoculação, procedeu-se às avaliações. EVALUATION OF RESISTANCE OF LINES, HYBRIDS F 1 AND CULTIVARS OF SWEET PEPPER TO MELOIDOGYNE SPP.ABSTRACT -With the purposes of evaluating F 1 hybrids of sweet pepper, together with their parents, for resistance to Meloidogyne incognita (races 1, 2, 3 and 4) and M. javanica nematodes, an experiment was conducted in glasshouse conditions in the facilities of Pioneer Sementes Ltda, in Ijaci, MG, Brazil. A randomized block in split-plot design was used with five plots, composed of four races of M. incognita and one isolate of M. javanica, and 48 subplots, composed of 47 genotypes of sweet pepper and one cultivar of tomato (Ângela Gigante I-5100) as a standard check. Five replicates and eight plants in each subplot were used. Inoculation was done with 60 eggs/mL of substrate mixture of vermiculite, Pinus sp. bark and carbonized rice husk. After 60 days following inoculation, the evaluations were performed. All the cultivars and standard-lines (line 004 and line 006) were susceptible to the races 1, 2, 3 and 4 of M. incognita. All the genotypes of sweet pepper were resistant to M. javanica. Almost all of the experimental lines were proved to be resistant to all of the four races of M. incognita. The same occurred to most of the experimental hybrids F 1 , although the degree of resistance of the hybrids in general was lower than that of their respective resistant parents. It is thus proven to be feasible to utilize F 1 hybrids by crossing resistant to susceptible sweet pepper lines to control the nematodes M. incognita and M. javanica through varietal resistance.

Response of Capsicum annuum L. var. annuum genotypes to root-knot nematode infection

“…Regarding RI, this cultivar showed a susceptible reaction to M. incognita race 3 and M. enterolobii and was highly resistant to M. javanica (Table 3). Peixoto et al (1999) also observed a susceptible reaction to M. incognita race 3 and resistance to M. javanica for 'Ikeda' when evaluating different genotypes of sweet pepper. Bitencourt and Silva (2010), Melo et al (2011), andGoncalves et al (2014) also observed susceptibility of 'Ikeda' to M. enterolobii.…”

Reaction of melon genotypes to Meloidogyne incognita and Meloidogyne javanica

“…Peixoto et al (1999) report that preventive measures are the most effective in controlling these phytoparasites. These include crop rotation, use of plants toxic to nematodes, soil solarization and application of chemical products.…”

Resistance of pepper lines against Meloidogyne incognita

“…Biber yetiştiriciliğinin yapıldığı alanlarda M. incognita'nın yaygın olduğu bilinmektedir. M. incognita biberde üreyip zarar verirken, M. javanica biberde üreyemez ve zarar veremez (Hartman & Sasser, 1985;Peixoto et al, 1997;Özarslandan & Elekcioğlu, 2003). Sebze alanlarında kök-ur nematodları ile mücadelede genellikle fumigant etkili nematisitler kullanılmaktadır.…”