Morphological variation and isozyme diversity in Dioscorea alata L. landraces from Vale do Ribeira, Brazil
AUTOR(ES)
Bressan, Eduardo de Andrade, Briner Neto, Thiago, Zucchi, Maria Imaculada, Rabello, Ronaldo José, Veasey, Elizabeth Ann
FONTE
Scientia Agricola
DATA DE PUBLICAÇÃO
2011-08
RESUMO
Traditional growers of the Vale do Ribeira, São Paulo State, grow and make use of several D. alata landraces. This study assessed the genetic diversity of 16 landraces, using isozymatic and morphological markers and comparing them with 19 commercial varieties of D. alata. Their distribution in different levels of organization such as households and communities of the Vale do Ribeira was evaluated. Isozymatic analyses were performed with polyacrylamide (six systems) and starch gels (one system), while the morphological analyses were carried out with 24 traits. Due to the polyploid nature of this species, the isozymatic bands were scored as binary data. Morphological traits were also scored as binary data. Principal coordinates and cluster analyses were conducted for both markers, using for the later the Jaccard´s similarity coefficient and UPGMA method. The separation of the landraces from the commercial varieties, which showed lower genetic diversity, was reported for both markers. No correlation between genetic and geographical distances was found for both data, which suggests that the observed variability is not spatially structured. Also, no correlation was found between both markers. The analysis of molecular variance (AMOVA) indicated that genetic diversity was mainly found within households for both isozymatic (54%) and morphological (70%) markers. The results obtained for both markers revealed the importance of traditional agriculturists in the Vale do Ribeira in maintaining high diversity for D. alata, even higher than the varieties commercialized in São Paulo State, contributing for the in situ/on farm conservation of this crop.
Documentos Relacionados
- Elementos do sistema reprodutivo de etnovariedades de batata-doce, provenientes do Vale do Ribeira, SP, Brasil
- Isoenzymatic and morphological diversity of yams (Dioscorea spp.) collected in swiddens of traditional agriculture of the Ribeira River Valley - SP
- Micropygomyia (Sauromyia) petari, a new species of Phlebotominae (Diptera, Psychodidae) from Vale do Ribeira, São Paulo State, Brazil
- Persistência da transmissão de Schistosoma mansoni em localidade de Itariri, na região do Vale do Ribeira, São Paulo, Brasil
- Caracterização da diversidade genética de inhame (Dioscorea alata) utilizando marcadores microssatélites