Abstract

VELASCO-HERNANDEZ, Sara Irene; MUNOZ-GUTIERREZ, Liliana; VARGAS-HERNANDEZ, J. Jesús  and  CASTELAN-LORENZO, Mario. Phenology of reproductive structures of Pseudotsuga menziesii (Mirb.) Franco. Rev. mex. de cienc. forestales [online]. 2023, vol.14, n.80, pp.80-104.  Epub Feb 05, 2024. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v14i80.1395.

Determining the beginning, the end, and the time length of each reproductive stage in ovule receptivity as well as in pollen dispersal allows to generate information for a genetic improvement program. The general goal was to determine the period for the receptivity of female strobili and pollen dispersal on a young tree plantation of Pseudotsuga menziesii treated with gibberellic acid (GA 4/7 and GA3) to promote flowering. Twelve trees with reproductive structures were monitored; three branches with female strobili and three branches with male structures were marked in each tree. The initial and end dates and time length of each of the phenological stages of flowering were registered and determined with the SYNCHRO macro using SAS software. The receptivity period of female strobili lasted on average 14 days, while pollen dispersal lasted between five and six days. The female receptivity periods and pollen dispersal showed high synchronization (P=0.60 and 0.64), while the correlation coefficients between phenological events are high and positive (r=0.87), in addition to being significant values (p≤0.001). Thus, the phenological events of pollen dispersal and female receptivity are highly synchronized and are not independent, so there is the probability of crossing between the trees.

Keywords : Gibberellic acid; pollen dispersal; floral induction; seed management; female receptiveness; phenological synchronization.

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