Assessing genetic variability in germplasm of Phaseolus vulgaris L. collected in Northern Portugal
2009; Elsevier BV; Volume: 122; Issue: 3 Linguagem: Inglês
10.1016/j.scienta.2009.05.035
ISSN1879-1018
AutoresRita C. Coelho, Miguel A. Faria, Joana Rocha, Aida Reis, M. Beatriz P.P. Oliveira, Eugénia Nunes,
Tópico(s)Agricultural pest management studies
ResumoThe common bean (Phaseolus vulgaris L.) is the most consumed legume in the world. In Portugal, the geographic isolation of the region surrounded by the mountainous barrier of Peneda-Gerês, Barroso and Marão is thought to have the safeguard of a large number of adapted bean populations. In order to assess the value of this germplasm to breeding programs, a study of 20 Portuguese landraces collected in this Northern region were evaluated for agronomical (days to flowering, plant height, days to harvest, weight of seeds per plant and 100 seeds weight), chemical (crude protein) and genetic diversity (microsatellite DNA). The 6 microsatellite loci used for molecular characterization contributed to differentiate most of the accessions that were grouped in terms of genetic proximity in two main clusters and two out-groups. There were significant differences in agronomical traits among accessions being early maturity, short plant type, and lower productivity per plant responsible for the genetic variability found. The late maturity landrace 7434 presented the most promising values for breeding based on plant productivity (31.5 g/plant) and protein content (27.9%). The studied collection of common beans presented genetic variability potentially useful in plant breeding programs to select protein content and plant maturity.
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