CLUSTER COMPOSITION OF POLLEN PARTICLES OF ATMOSPHERE UPON BLOOMING OF ANEMOPHILOUS PLANTS
A study is made on pollen emission into atmosphere of 12 species of anemophilous plants ( Betula fusca Pall. ex Georgi, Betula pubescens Ehrh. , Ulmus pumila L. , Corylus americana Marsh. , Corylus avellana L. , Stipa pennata L. , Poa nemoralis L. , Achnatherum splendens (Trin.) Nevski , Panicum virgatum L. , Lolium perenne L. , Avena sativa L. , Setaria maximowiczii Tzvelev & Prob.), exposed by the Central Siberian Botanical Garden, SB RAS. These plants are widely spread over the territory of the Russian Federation and produce great amounts of allergenic pollen. Estimated is the share of clusters of two and more pollen grains in the total number of pollen particles, entering the atmosphere upon blooming of plants of a given species. It is shown that although the anemophilous plants display morphological properties, that prevent the formation of clusters, substantial number of such clusters is recorded in all experimental series. In this case, the share of pollen grains could exceed 50% of the total number of pollen grains, entering the atmosphere.