Resumen

VIVEROS-VIVEROS, Héctor; TAPIA-OIVARES, Blanca Ll.  y  SAENZ-ROMERO, Cuauhtémoc. Pinus pseudostrobus Lindl. isoenzimatic variation along an altitudinal gradient in Michoacán, Mexico. Agrociencia [online]. 2014, vol.48, n.7, pp.713-723. ISSN 2521-9766.

Pinus pseudostrobus Lindl. is the pine species of major economic importance in the state of Michoacán. For its conservation and sustainable management both the variation of quantitative traits with adaptive value as well as the genetic diversity through markers neutral to selection should be known. In the present study the genetic isoenzymatic variation among populations of P. pseudostrobus along an altitudinal gradient (2200-2910 m of altitude) in the state of Michoacan, Mexico was investigated. In January 2001, seeds from eight locations, separated by 100 m altitude were collected; in each population from 9 to11 trees were randomly selected. Polymorphism was found in 12 of the 14 loci examined. The expected average heterozygosity (H_e) was 0.10. In all loci Hardy-Weinberg equilibrium was found. Genetic differentiation among populations was significant (F_ST= 0.017), although it was low. Average genetic distance (0.078) was low, and average gene flow was high (N_m=14.5). It was found a weak pattern of genetic variation associated with altitude of origin of populations, in which lower altitude populations presented a greater effective number of alleles than higher altitude populations. To preserve genetic diversity it is suggested to establish three Forest Genetic Resource Conservation Units (FGRCU), one for each of the following altitudinal ranges, with the minimum size of a viable effective population (N_e) as follows: between 2100 and 2400 m with 3422 individuals in reproductive age, between 2400 and 2700 m with 1586 individuals, and 2700 and 3000 m with 2321 individuals.

Palabras llave : Pinus psedostrobus; altitudinal genetic variation; forest genetic resource conservation; gene flow; isoenzymes.

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