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Title: Diversidade em Psidium guajava L. por caracteres morfológicos, moleculares e citogenéticos
Other Titles: Diversity in Psidium guajava L. by morphological, molecular and cytogenetics
Authors: Coser, Sara Morra
Keywords: Melhoramento de plantas;Diversidade genética;Descritores morfológicos;Qualidade de frutos;SSR;Conteúdo de DNA nuclear (2C);Plant breeding;Genetic diversity;Gorphological descriptors;Fruit quality;SSR markers;Nuclear 2C-value
Issue Date: 12-Jul-2012
Publisher: Universidade Federal do Espírito Santo
Citation: COSER, Sara Morra. Diversity in Psidium guajava L. by morphological, molecular and cytogenetics. 2012. 87 f. Dissertação (Mestrado em Fitotecnica; Recursos Florestais) - Universidade Federal do Espírito Santo, Alegre, 2012.
Abstract: Guava (Psidium guajava L.) is one of the most economically important fruit crop from Myrtaceae family. Brazil is one of the largest producers of guava in the world, which is a potential crop in growth and profitability. Cross-pollination of the species and the existence of heterogeneous seminal propagation orchards result in variability, allowing the selection of genotypes for crop improvement. The aim of this study was to evaluate genetic diversity between P. guajava L genotypes selected from seminal origin orchard and cultivars, by morphological and fruit quality chemical characteristics, also associate data from nuclear 2C-value, karyotypic, morphological and simple sequence repeat (SSR) marker. There were divergences between Cortibel selections by fruit characteristics, with genotypes showing superior and similar performance when compared with cultivated genotypes, potential for use in hibridation and as cultivars. Karyotype and nuclear 2C-value analyses showed that all genotypes have a stable and very small diploid genome (2n = 2X = 22; 2C = 0.95 pg), and karyotypic characteristics related to ancestral angiosperm groups. UPGMA dendrogram based on morphological and SSR data evidenced diversity among the genotypes, with better discrimination by SSR data. Since most genotypes showed morphological similarity for fruit characteristics, combined with molecular dissimilarity, the use of these genotypes in hybridation breeding programs could be of interest. The obtained data set contributed to expand the knowledge about genome and genetic diversity of P. guajava. Also are important to structure crop improvement programs and contribute to evolutionary approaches
Appears in Collections:PPGPV - Dissertações de mestrado

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