Age-age correlation for early selection of rubber tree genotypes in São Paulo State, Brazil

Genetics and Molecular Biology

Paulo De Souza Gonçalves¹  Nelson Bortoletto²  Átila Bento Beleti Cardinal²  Lígia Regina Lima Gouvêa²  Reginaldo Brito Da Costa²  Mário Luiz Teixeira De Moraes² 

[1] ,Instituto Agronômico de Campinas Programa Seringueira Campinas SP ,Brazil

关键词: Hevea brasiliensis;    early clonal multiplication;    genetic correlation;    rank correlation;    evaluation of clones;   

DOI  :  10.1590/S1415-47572005000500018

来源: SciELO

【 摘 要 】

In a field trial involving 68 rubber tree (Hevea spp.) clones calculation of genotypic correlation coefficients revealed significant age-age correlation from age 1 to 6 (immature period) for girth A and for age 7 to 12 (mature period) for girth B and for age 7 to 12 (production of latex) for yield. Rank correlation coefficients between all immature ages of girth (girth A), all ages of mature girth (girth B) and all annual rubber production (yield) were significant for the three traits, with the coefficients decreasing with increasing age. Selection of the sets of best 30, 15, 10 and 5 clones from the available 68 clones at a given age was generally accompanied by a descending order of percentage success. It was suggested: (a) to have the best 30 clones of age 6, select the set of best 36 clones at age 2, (b) to have the best 15 clones of age 6, select the set of best 20 clones at age 3, (c) to have the best 5 clones of age 6, select the set of best 8 clones at age 4, and (d) to have the best 3 clones of age 6, select the set of best 3 clones at age 5. More than 80% of the targeted clones on girth A or girth B basis and more than 76.7% clones on yield basis were found to get selected at steps (a) through (d). For achieving early multiplication of the most productive clone for deployment, multiplication should be started with the best 36 (i.e. 60%) clones selected at age 2.

【 授权许可】

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