Neotropical Entomology (2009) 38, 671-676

Joseane R. de Souza, Evane Ferreira, Alberto Cargnelutti Filho, Arlindo L. Boiça Jr., Evandro F. das Chagas and Janaína M. Mondego (2009)
Divergência genética de cultivares de arroz quanto à resistência a Tibraca limbativentris Stål (Hemiptera: Pentatomidae)
[Genetic divergence of rice cultivars for resistance to Tibraca limbativentris Stål (Hemiptera: Pentatomidae)]
Neotropical Entomology 38 (5), 671-676
Abstract: The genetic divergence of sixteen rice cultivars regarding their resistance to the rice stem bug, Tibraca limbativentris Stål, was estimated by multivariate analysis techniques. The experiment was carried out in greenhouse, in randomized block design with eight replications. Eight plant resistance related traits were evaluated. Genetic divergence was evaluated by multivariate procedures: generalized Mahalanobis (D²) distance, the Tocher's grouping optimization method and canonical variables. The most dissimilar cultivars were Bico Ganga and Marabá Branco, while Agulha and Branco Tardão were the most similar. Five clusters were formed by the Tocher's optimization method. Three canonic variables explained 88.5% of the observed variation. We concluded that the multivariate analysis techniques are suitable for analyzing the genetic divergence among rice cultivars, indicating Bico Ganga and Marabá Branco as the most promising for future breeding programs of resistance to the rice stem bug.
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(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tibraca limbativentris	Rice (Oryza)	Brazil (south)