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Acta Scientiarum. Agronomy

On-line version ISSN 1807-8621

Abstract

GOMES FILHO, Aroldo et al. RAPD molecular markers and morphological descriptors in the evaluation of genetic diversity of guava (Psidium guajava L.). Acta Sci., Agron. (Online) [online]. 2010, vol.32, n.4, pp.627-633. ISSN 1807-8621.  http://dx.doi.org/10.4025/actasciagron.v32i4.4720.

The knowledge of the genetic and phenotypic variability among different accessions of guava is important for supporting improvement programs of this specie in northern Rio de Janeiro state, which needs new cultivars able to generate income for local farmers. This work aimed to evaluate the genetic divergence among six cultivars and 19 accessions of guava via RAPD molecular markers and morphological characteristics. One hundred and seventeen polymorphic markers were obtained from 28 primers. The results showed a partial agreement between the methods of studied groupings, with the formation of 12 groups. The accessions 'Vita 3'and '6' were the most divergent, showing genetic distance of 0.663. The comparative analysis of groupings showed that RAPD markers and morphological descriptors were effective in discriminating the accessions and to show potential genetic variability useful in genetic improvement programs.

Keywords : polymorphic; genetic variability; Tocher's optimization method; UPGMA cluster analysis.

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