Resumo

VELASQUEZ, Rosalía; DELGADO, Nelly  e  ANGULO-GRATEROL, Luis. Genetic diversity of resistance and sensitive rice genotypes to sogata mechanical damage. Agronomía Trop. [online]. 2014, vol.64, n.1-2, pp.19-29. ISSN 0002-192X.

The Delphacidae family is a group of insects that cause significant damage in cereals. Genetic diversity among six genotypes of rice (Oryza sativa L.), with different behaviors for resistance and susceptibility to mechanical damage from sogata (Tagosodes orizicolus) was studied by molecular SSR microsatellite markers, distributed in the twelve rice chromosomes.151 SSR were used for UPGMA clustering analysis and Dice distance. In the discriminant analysis, three groups were formed with cophenetic correlation of 0.87, the first constituted by Bluebonnet 50; in the second group were D-Sativa, Cimarron, Venezuela 21 and Zeta 15; and in the last group was Makalioka. Similarity coefficients of the groups were 0.55, 0.74 and 0.66 for each of the clusters. Clear separation was observed in the formation of groups between Makalioka and Bluebonnet 50 as resistant and susceptible genotypes, respectively. Molecular analysis showed a close genetic variability for genotypes. In determining the polymorphism between contrasting parents for mechanical sogata damage, the highest percentage 23.18% was observed between Zeta 15 and Bluebonnet 50 cultivars, followed by Cimarron and Bluebonnet 50 with 20.53%, and the lowest percentage for D-Sativa and Venezuela 21, and Venezuela 21 and Zeta 15, with 12.58% and 4.64%, respectively. These results will be used in the identification and association between SSR and characteristics related to mechanical sogata damage.

Palavras-chave : Oryza sativa L.; Tagosodes orizicolus; clustering analysis; microsatellite; molecular markers.

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