Genetic Diversity and Structure of the Portuguese Pear ( Pyrus communis L.) Germplasm

Álvaro Queiroz, Joana Bagoin Guimarães, Claudia Sánchez, Fernanda Simões, Rui Maia de Sousa, Wanda Viegas and Maria Manuela Veloso
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Álvaro Queiroz: Instituto Politécnico de Viana do Castelo, Escola Superior Agrária, P 4990-706 Ponte de Lima, Portugal
Joana Bagoin Guimarães: Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Investigação de Biotecnologia e Recursos Genéticos, Quinta do Marquês, 2784-505 Oeiras, Portugal
Claudia Sánchez: Instituto Nacional de InvestigaçãoAgrária e Veterinária, Estação Nacional de Fruticultura Vieira de Natividade, 2460-059 Alcobaça, Portugal
Fernanda Simões: Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Investigação de Biotecnologia e Recursos Genéticos, Quinta do Marquês, 2784-505 Oeiras, Portugal
Rui Maia de Sousa: Instituto Nacional de InvestigaçãoAgrária e Veterinária, Estação Nacional de Fruticultura Vieira de Natividade, 2460-059 Alcobaça, Portugal
Wanda Viegas: LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
Maria Manuela Veloso: Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Investigação de Biotecnologia e Recursos Genéticos, Quinta do Marquês, 2784-505 Oeiras, Portugal

Sustainability, 2019, vol. 11, issue 19, 1-12

Abstract: A rich heritage of traditional pear varieties is kept in national Portuguese collections. Out of these varieties, “Rocha” dominates national pear production. Although a noticeable phenotypic variation among clones of this variety has been reported, little is known about its genetic variability, as to date molecular studies have been performed on a single “Rocha” clone. Eleven Simple Sequence Repeats (SSR) markers were used to assess the genetic diversity of 130 local cultivars, 80 of them being “Rocha” clones. The results allowed the differentiation of 75 genotypes of which 29 are “Rocha”. Three synonyms groups and four homonymous groups of other local varieties were confirmed. A Bayesian model-based clustering approach identified two distinct clusters. Using flow cytometry, six cultivars were found to be triploids. These results show high genetic variability among “Rocha” clones. In conclusion, there is a need for different “Rocha” clones to be preserved to enable the correct selection of the multiplication material.

Keywords: pear genetic resources; SSR markers; identification; differentiation; clones discrimination (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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