Divergence and genetic variability among superior rubber tree genotypes

Pesquisa Agropecuária Brasileira

Lígia Regina Lima Gouvêa²  Alisson Fernando Chiorato¹  Paulo De Souza Gonçalves² 

[1] ,Instituto Agronômico (IAC) Programa Seringueira Campinas SP ,Brazil

关键词: Hevea brasiliensis;    crossbreeding;    multivariate analysis;    selection;    Hevea brasiliensis;    cruzamentos;    análise multivariada;    seleção;   

DOI  :  10.1590/S0100-204X2010000200007

来源: SciELO

【 摘 要 】

The objective of this work was to estimate the genetic variability and divergence among 22 superior rubber tree (Hevea sp.) genotypes of the IAC 400 series. Univariate and multivariate analyses were performed using eight quantitative traits (descriptors), including yield. In the univariate analyses, the estimated parameters were: genetic and environmental variances; genetic and environmental coefficients of variation; and the variation index. The Mahalanobis generalized distance, the Tocher agglomerative method and canonical variables were used for the multivariate analyses. In the univariate analyses, variability was verified among the genotypes for all the variables evaluated. The Tocher method grouped the genotypes into 11 clusters of dissimilarity. The first four canonical variables explained 87.93% of the cumulative variation. The highest genetic variability was found in rubber yield-related traits, which contributed the most to the genetic divergence. The most divergent pairs of genotypes are suggested for crossbreeding. The genotypes evaluated are suitable for breeding and may be used to continue the IAC rubber tree breeding program.

【 授权许可】

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