Karyological and morphological variation within Petrosimonia brachiata Bunge in Bulgaria
2019
Neli Grozeva | Mima Todorova | Dimitar Pavlov
We studied karyological and morphological variability of the only representative of the genusPetrosimonia (Amaranthaceae) in Bulgaria and evaluated the current state of its populationsin the country. The results indicated that Bulgarian populations of Petrosimonia brachiatahave a diploid chromosome number of 2n = 16. In the population from the Pomorie Lake,the karyotype consists of six pairs of metacentric and two pairs of sub-metacentric chromosomes.In the population from the Atanasovsko Lake, satellites were observed on one pairof sub-metacentric chromosomes. Statistical analysis demonstrated that the main source ofphenotype variation in the species is within the populations. Vegetative traits are more variablethan generative ones. No significant variability was found in the studied quantitativecharacteristics or pollen morphology. Given the biological type of the species (annual) and itslimited distribution in Bulgaria, the status of the two populations of P. brachiata cannot beregarded as stable, and the danger of a potential threat to them in the future is a possibilitynot to be excluded.
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