Abstract
The article provides the results of a study dealing with pollen release into the atmosphere by 23 species from 21 genera of the Poaceae Barnh family. The species under investigation are the dominant ones in natural plant communities and are used as components in turf plant ^communities and belong to the group of ornamental grasses. Their pollen causes seasonal hay fever (allergic rhinitis), which accounts for the interest in the regularities of its drift. The drift distance is determined by the particles sedimentation velocity and depends on the number of pollen grains they include. The study estimates the cluster composition of pollen particles released into the atmosphere. All species under consideration massively form clusters consisting of two or more grains. Their share was 11,1-50,8%, the share of pollen grains in them was – 21.9-84,0%.
Highlights
Pollen particles are invariably a part of a fraction of primary biogenic aerosol particles, extremely diverse in its composition and origin [1], being the biggest in size in the group
Pollen sediments observed by light microscopy differ drastically in its cluster composition from those which could have been observed/could have appeared had the clusters been formed on the glass slides from single pollen grains sedimented on them
The statistical processing of the data unequivocally shows that the particles of this kind are formed not on the capturing substrate from single pollen grains in the process of their sedimentation, but directly in anthers in the process of grass pollen release into the atmosphere
Summary
Pollen particles are invariably a part of a fraction of primary biogenic aerosol particles, extremely diverse in its composition and origin [1], being the biggest (from 10 to 100 μm, in average – 20-40 μm) in size in the group. They play the key role in the process of plant seed reproduction and the exchange of genetic material both within a population and between remote populations. The grass family Poaceae Barnh is one of the largest families of angiosperms plants It includes about 8000 species and 500 genera distributed among 60-80 tribes and several subfamilies. Continuous growth in the number of hay fever cases stimulates interest in modelling the process of pollen spread in the air [7,8]
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