Phenotype selection and reproductive characteristics of Pinus pseudostrobus var. oaxacana (Mirov) S.G.Harrison
DOI:
https://doi.org/10.29298/rmcf.v11i59.700Keywords:
Outstanding tree, seed tree, cones characteristics, reproductive characteristics, inbreeding, environmental factorsAbstract
Pinus pseudostrobus var. oaxacana, an important species of Oaxaca State from its wood quality; even though it is preferred for reforestation and plantations, the seed production capacity of this species is unknown. The aim of the actual study was to evaluate the morphological variation, reproductive characteristics and their relationship with environmental factors of cones and seeds of selected P. pseudostrobus var. oaxacana trees as seed trees from five provenances of the state. From November to December 2017, 1 058 cones were collected from 42 selected trees, to which the following characteristics were assessed: length, diameter, dry weight, number of scales, number and of weight of fully developed seeds, average weight per seed, reproductive efficiency and inbreeding index. Trees and provenances were differentiated by analysis of variance and mean tests (Duncan, 0.05). Reproductive characteristics were correlated with environmental variables (collection sites) and morphological characteristics. Selected trees were 51.7±8.0 years old, 36.4±4.6 m high and 54.5±8.2 cm diameter at breast height. The average values per cone were: 101.3 mm long; 56 mm diameter, 97.9 g dry weight; 133 scales; 107 developed seeds per cone; 2.35 g weight of developed seeds per cone; 0.021 g average weight per seed; reproductive efficiency of 13.09 mg per gram of strobilus; inbreeding index (II = 0.50) indicates a high level of self-fertilization. Of the evaluated characteristics, reproductive efficiency and II did not show significant differences.
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