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Genetic parameters and values prediction for growth and latex production traits in rubber tree progenies

This study aimed to estimate genetic values and parameters for plant height, diameter, rubber yield and productivity (g cm-2) of rubber tree progenies. Half-sib progenies were established in a complete randomized block, with 28 treatments, five replicates and 10 plants per plot. At three years of life, the progenies were evaluated regarding the following characters: diameter, rubber production and productivity (g cm²). The estimative coefficients of individual heritabilities (0.33; 0.24 and 0.51) for plant height, diameter and area production, respectively, were considered expressive. For the character of rubber yield the estimative of the coefficient of individual heritability, towards restrictive (9%), although of low magnitude, indicates an excellent chance once selection, it led to an estimate of heritability at family average level, to an equivalent value of 68%. The accuracy among the genetics values predicted and the true ones were of 0.80 for height, 0.76 for diameter, 0.62 for rubber yield and 0.86 for productivity (g cm²). The estimative of individual heritability associated with the average of progenies can maximize the genetic gains with selection in to the population. The inclusion of productivity character is promising and should be considered in future evaluations, supporting the species genetic improvement program in Mato Grosso do Sul State.

Hevea brasiliensis; genetic parameters; heritability; genetic gain


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