Resumen

BARRERA RAMIREZ, Rubén et al. Intraspecific variation in cold tolerance in Pinus pseudostrobus progenies at two test sites. Madera bosques [online]. 2024, vol.30, n.2, e3022548.  Epub 04-Feb-2025. ISSN 2448-7597.  https://doi.org/10.21829/myb.2024.3022548.

Cold tolerance has adaptive value for perennial plants in cold-temperate climates, so it is important to detect genetic variation for this trait in forest trees. In two Pinus pseudostrobus progeny tests established at Pueblo Nuevo, Puebla (S1, 2853 m) and Teolocholco, Tlaxcala (S2, 2355 m), the cell damage index (ID) was determined in four-year-old plants with a freezing test, and its relationship with height growth, and bioclimatic variables at the origin site of families, in the central region of Mexico, was estimated. Tolerance to low temperatures was determined with the electrolyte leakage (REL) method, at -15 °C for 4 h. Analysis of variance was performed with Proc Mixed, using a randomized complete block design. Mean DI differed between sites (P < 0.05) and was higher at S1 (60.7%) than at S2 (50%); genetic parameters indicated that cold tolerance is under genetic control (h2f ≥0.50). Height growth of progenies at S2 was greater than at S1. The bioclimatic variables with the highest correlation (r ≥ 0.55) with ID and height growth are related to humidity, temperature, and precipitation from autumn to winter. Frost damage of families varied between sites, showing that there is genotypeenvironment interaction associated with cold tolerance in some progenies; in addition, climatic factors associated with humidity, temperature and precipitation are also important for adaptation and growth of Pinus pseudostrobus progenies.

Palabras llave : phenology; damage index; growth rate; frost tolerance; climate variables.

        · resumen en Español     · texto en Español     · Español ( pdf )