VARIAÇÃO GENÉTICA EM PROCEDÊNCIAS E PROGÊNIES MEXICANAS DE Pinus maximino
DOI:
https://doi.org/10.24278/2178-5031.2004161447Keywords:
Pinus maximinoi, genetic improvement, selection, tropical pinesAbstract
The objectives of the experiment were to evaluate growth and stem quality in Mexican provenances and progenies of Pinus maximinoi and to estimate genetic variation for breeding purposes. It was established at Angatuba State Forest, in the State of São Paulo, and the analyses involved performances in height growth, diameter at breast height (DBH), stem straightness and number and diameter of branches. Only in height growth there was significant variance among provenances detected at eleven years old. Among progenies within provenances, significant variations were detected in all traits showing possibilities of genetic gains by selection in this level. P. maximinoi from any of the provenances represented in this study can be recommended for commercial plantation in Angatuba region. Its performance was comparable to that of P. oocarpa used as control species. The estimates of genetic variation indicated that most of them are distributed among trees within progenies and the highest heritability was observed at progeny level. The results suggest that the greatest genetic gains can be reached through progenies selection followed by selection within progenies. The greatest response to selection was estimated in DBH with potential gain in the order of 8.4% at eleven years old.
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