CLONE SELECTION OF Hevea brasiliensis TO MOCOCA REGION, STATE OF SÃO PAULO
DOI:
https://doi.org/10.4322/rif.2015.010Keywords:
clonal test, selection, rubber tree, genetic improvementAbstract
Hevea brasiliensis (Willd. ex Adr. Juss.), locally known as seringueira, is used for latex production and at the end of production cycle, wood may be used for furniture. Thus, the breeding aimed at increasing the production of latex and wood. Our goal was to determine the genetic variability, genetic growth control of traits and selection of clones from Mococa region, São Paulo state. A clonal plantation was established in Mococa municipality, and experimental design used was randomized blocks, at a spacing of 7 x 2 m, eight treatments (clones), three replicates and 12 plants per plot. The evaluated traits were: diameter at breast height (DBH, 1.3 m from the ground), total height – TH, bifurcation height – BH and individual real wood volume – VOL. Significant differences were detected between clones for all traits, indicating the possibility of improvement by selection. Broad-sense heritability coefficient was high (0.72) for BH and low to DBH and VOL. Genetic correlation coefficient was high, positive and significant for the traits (TH x DBH, DBH x VOL and TH x VOL, which indicates that selection on a trait may results gains in another trait. Results showed that clones selection with higher DBH may results in increase of TH and VOL in commercial plantation. We emphasize that RRIM701 clone, from Malaysia, is the most appropriate for all growth traits for growing in Mococa-SP.
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References
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