Genetic diversity associated with natural rubber quality in elite genotypes of the rubber tree

Autor(es)

Sant'Anna, Isabela de Castro ^[1] ; Lima Gouvea, Ligia Regina ^[2] ; Martins, Maria Alice ^[3] ; Scaloppi Junior, Erivaldo Jose ^[1] ; de Freitas, Rogerio Soares ^[1] ; Goncalves, Paulo de Souza ^[2]

Afiliação do(s) autor(es)

^[1] Agron Inst IAC, Ctr Rubber Tree & Agroforestry Syst, Votuporanga - Brazil

^[2] Agron Inst, Seringueira Program, Campinas - Brazil

^[3] Nanotechnol Natl Lab Agr LNNA, Embrapa Instrumentat, Sao Carlos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 11, n. 1 JAN 13 2021.
• Citações Web of Science: 3

Resumo

The objective of this study was to evaluate the genetic variability of natural rubber latex traits among 44 elite genotypes of the rubber tree {[}Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell. Arg.]. Multivariate analysis and machine learning techniques were used, targeting the selection of parents that demonstrate superior characters. We analyzed traits related to technological or physicochemical properties of natural rubber latex, such as Wallace plasticity (P-0), the plasticity retention index {[}PRI (%)], Mooney viscosity (V-R), ash percentage (Ash), acetone extract percentage (AE), and nitrogen percentage (N), to study genetic diversity. Multivariate {[}unweighted pair group method with arithmetic means (UPGMA) and Tocher)] and machine learning techniques {[}K-means and Kohonen's self-organizing maps (SOMs)] were employed. The genotypes showed high genetic variability for some of the evaluated traits. The traits PRI, Ash, and P-O contributed the most to genetic diversity. The genotypes were classified into six clusters by the UPGMA method, and the results were consistent with the Tocher, K-means and SOM results. PRI can be used to improve the industrial potential of clones. The clones IAC 418 and PB 326 were the most divergent, followed by IAC 404 and IAC 56. These genotypes and others from the IAC 500 and 400 series could be used to start a breeding program. These combinations offer greater heterotic potential than the others, which can be used to improve components of rubber latex quality. Thus, it is important to consider the quality of rubber latex in the early stage of breeding programs. (AU)

• Processo FAPESP: 18/26408-0 - Diversidade genética e caracterização de descritores de seringueira
• Beneficiário: Isabela de Castro Sant'Anna
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/18300-4 - Obtenção de genótipos de seringueira adaptados a diferentes regiões do estado de são paulo visando aumento de sustentabilidade heveícola
• Beneficiário: Paulo de Souza Gonçalves
• Modalidade de apoio: Auxílio à Pesquisa - Regular