VARIABILITY OF SOME POLLEN MORPHOLOGICAL TRAITS OF CERTAIN TAXONS IN THE BORDERING AREA OF THE CEAHLĂU NATIONAL PARK
Journal Title: Analele Stiintifice ale Universitatii Alexandru Ioan Cuza din Iasi, Serie noua, Sectiunea II a. Biologie vegetala - Year 2008, Vol 54, Issue 2
Abstract
This study presents the variability of four pollen morphological traits from three taxons: Ranunculus polyanthemos L., Veronica chamaedrys L. and Plantago media L., sampled from four stationaries found in the bordering area of the Ceahlău National Park. Among the four stationaries, three of them were affected by polluting noxa agents (dust powder from the cement factory of Taşca and escapement gases), and one was used as control. The four pollen morphological traits taken into account were: shape of the pollen grain, exine ornamentations, size of the pollen grain, number of germinative pores/pollen grain. For a real evaluation of these traits, determinations were carried out on 1000 grains/taxon. Being qualitative traits, the shape of pollen grain and exine ornamentations were estimated by description and microphotographs. As quantitative traits, the size of pollen grain diameter and the number of germinative pores/pollen grain were determined by biostatistic methods. Measuring the diameter of the pollen grains was a safe way to separate the diploid against self-tetraploid or mixoploid plants. On the other hand, there was a tight correlation between the number of germinative pores/pollen grain and the plant polyploidy degree. The shape of the pollen grain, next to the exine ornamentations did not show variability from one individual to another of the same taxon, no matter if the stationary was or not polluted; this proved the genetic strengthen of these two qualitative traits. The biostatistic indices of the two quantitative traits shaped the limits of pollen variability in the three taxons, which depended not only on genotype but also on environment.
Authors and Affiliations
SILVICA PĂDUREANU
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