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Estimates of genetic parameters and correlations of juvenile characters based on open pollinated progenies of Hevea

Paulo de Souza Gonçalves^I; Antonio Lúcio Mello Martins^II; Nelson Bortoletto^III; Marcel Ricardo Tanzini^IV

^IPrograma Seringueira, Divisão de Plantas Industriais (DPI), Instituto Agronômico de Campinas (IAC), Caixa Postal 28, 13001-970 Campinas, SP, Brasil. Send correspondence to P.S.G.
^IIEstação Experimental de Pindorama, Divisão de Estações Experimentais (DEE), IAC, Caixa Postal 24, 15830-000 Pindorama, SP, Brasil
^IIIEstação Experimental de Votuporanga, Divisão de Estações Experimentais (DEE), IAC, Caixa Postal 401, 15500-000 Votuporanga, SP, Brasil
^IVEstagiário bolsista do Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

ABSTRACT

An investigation of 10 characters was conducted in three-year old open pollinated progenies of rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Müell. Arg.]. The experiment included 17 families replicated in five blocks of ten tree rows. The characters studied were: average yield according to Hamaker-Morris-Mann test, virgin bark thickness, total number of latex vessel rings, overall density of latex vessels per ring per five square millimeters of bark, average diameter of latex vessels, average distance between consecutive latex vessel rings, average leaf area, crown form and stem circumference. Heritability as well as genotypic, phenotypic and environmental correlations among characters were estimated. Heritability values from progeny analysis data ranked from 0.08 (average distance between consecutive latex vessel rings) to 0.82 (average yield). Positive genetic correlations were found between average yield and characters of the laticiferous system. No relationship was found between average yield and stem circumference. Crown form and average yield were related (r = 0.55493), indicating that trees with high yield tend to have better crown form. No phenotypic correlation was found between average yield and total number of latex vessel rings, average leaf area, average diameter of latex vessels and average distance between consecutive latex vessel rings.

Keywords: genetic parameters; juvenile characters; open pollinated progenies; Hevea.

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