Abstract

CRUZ CORTES, Leonel et al. Fruits and seeds of Bursera heliae Rzed. & Calderón, an endemic species of Oaxaca and its relationship with site factors. Rev. mex. de cienc. forestales [online]. 2017, vol.8, n.40, pp.89-103. ISSN 2007-1132.

Bursera heliae, a prevalent tree species in the low deciduous forest of Oaxaca, has problems to regenerate through seeds, due to disturbances in its natural habitat and to the overexploitation of its populations. The objective of this research was to characterize the fruits-seeds and to relate site variables in individuals selected phenotypically in Santa María Zoquitlán, Oaxaca. Directed samplings carried out in 2015 identified and inventoried 17 trees, and the following parameters were registered in a random sample of 50 fruits and 500 seeds per tree: the polar and equatorial diameters (mm), weight (g), and number of seeds per kilogram. Mean tests (Tukey, 0.05) and variance, correlation and cluster analyses were applied among parent trees. The results indicated heights of 89.6± 28.2; normal diameters of 4.2±1.1 cm; crown diameters of 5.1±1.7 m, and crown surface areas of 23.2±15.0 m2. The range of the fruit diameter was 0.82± 0.65 cm, and the weight of the fruits was 0.329± 0.07 g, while the diameter of the seeds was 0.57± 0.46 cm, and their weight was 0.104± 0.08 g, according to the size of the tree. The species contains 9 989 ± 1 768 seeds per kilogram. Correlations of the site and dasometric characteristics with those of the fruits and seeds were obtained. Collection of seeds from trees with outstanding phenotypes 7, 10 and 12 and progeny tests are recommended as a previous step to the propagation and establishment of B. heliae plantations.

Keywords : Parent tree; Bursera heliae Rzed. & Calderón; site characteristics; phenotype; low deciduous forest; dasometric variable.

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