Host status and phenotypic diversity of rice genotypes in relation to Pratylenchus brachyurus resistance

Host status and phenotypic diversity of rice genotypes in relation to Pratylenchus brachyurus... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematology Brill

Host status and phenotypic diversity of rice genotypes in relation to Pratylenchus brachyurus resistance

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Publisher
Brill
Copyright
Copyright 2016 by Koninklijke Brill NV, Leiden, The Netherlands.
Subject
Articles
ISSN
1388-5545
eISSN
1568-5411
D.O.I.
10.1163/15685411-00002938
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

NematologyBrill

Published: Jan 1, 2016

Keywords: broad-sense heritability; Oryza sativa ; resistance; root-lesion nematode; variance components

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