The aim of this study was to assess the susceptibility of rice genotypes to Pratylenchus brachyurus and investigate the inheritance of resistance in the crop. Two experiments were conducted under controlled conditions, using naturally infested soil. Twenty-six rice genotypes were assessed, with maize used to show the susceptibility pattern. The maize was cultivated for 90 days and the initial nematode population was determined. Then, rice genotypes were cultivated, and the final nematode population and the reproduction factor (RF) were estimated 90 days after germination. All genotypes were susceptible to P. brachyurus in the two experiments but only one showed statistical differences, indicating variation in susceptibility, and genotypes Linhagem L03-107 and Cateto Amarelo scored higher than the control genotype, with RF of 8.80 and 9.48, respectively. Inheritance of resistance was poorly influenced by genotype genetics. Cluster analysis allowed the identification of five different groups of genotypes but there was low genetic variability among the genotypes.
Componentes de produção e produtividade de grãos de arroz de sequeiro em função do espaçamento e da densidade de semeadura.
Characterization of Brazilian populations of Pratylenchus brachyurus using morphological and molecular analyses.
Tropical Plant Pathology40102-110.
Avaliação da reação de espécies vegetais ao nematóide das lesões radiculares. In:
Reunião de Pesquisa de Soja da Região Central do Brasil. Londrina, BrasilEmbrapa Soja pp.