THE INFLUENCE OF CLIMATIC CONDITIONS ON THE MALE REPRODUCTIVE SPHERE ACTIVITY OF CONIFERS IN THE NORTHERN TAIGA
M. V. Surso
Federal Research Center for Comprehensive Study of the Arctic named after Academician N. P. Laverov, Russian Academy of Sciences, Ural Branch, Arkhangelsk, Russian Federation
Keywords: coniferous species, northern taiga, male reproduction, climate, air temperature regime, adaptation
Abstract
The results of long-term studies of microsporogenesis in autochthonous coniferous species in the northern taiga are presented. The phenorhythmics of microsporocyte meiosis has been studied. Characteristic disorders in meiosis are described. The total number of chromosomal abnormalities in microsporocyte meiosis increases with increasing environmental factors. Teratology of pollen and is described. The total number of anomalies in the total pollen pool is estimated. The number of abnormal pollen grains in the total pollen pool is small. The long-term dynamics of pollen viability has been studied. The indicators of pollen viability in all studied species vary greatly by year. The correlation between the total number of disorders in microsporocyte meiosis, the number of abnormal pollen grains, and pollen viability is not always clear enough. The number of such violations increases markedly only in years with extremely unfavorable weather conditions during microsporogenesis.
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