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Reproductive biology of the endangered Bulgarian endemic Centaurea achtarovii (Asteraceae)

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Abstract

Centaurea achtarovii Urum. is a Bulgarian endemic, distributed only in Pirin Mountain. It is protected by the Biodiversity Act and included in the Red Data Book of Bulgaria as “endangered”. Assessment of size and density was carried out of both known populations of the species, around Orelyak summit and Kazanite locality. It was conducted in 2 sampling plots of 1000 square meters in each population and revealed their good condition. Population of Orelyak was larger and with higher density than that of Kazanite: 75 ha, 0.58 individuals per m2 (an average of 0.56 rosettes and 0.02 in flowering stage), and 35 ha, 0.23 individuals per m2 (an average of 0.16 rosettes and 0.07 in flowering stage), respectively. Elucidation of the reproductive biology of C. achtarovii was important in order to find the most appropriate conservation strategy for the species. Flower buds and open flowers in different stages of development were treated by the classical paraffin methods. The structures in male and female generative spheres were stable, the processes leading to formation of embryos and seeds were balanced, and no apomixes was noticed. Pollen viability assessed by acetocarmine test was over 50%, and seed viability estimated by tetrazolium test was 17.5%. In vitro seed germination was poor and culture growth was slow. The low viability of seeds, and the small amount of pollen, although with relatively high fertility, determined a low reproductive capacity of the species. In situ strategies reducing competitive species like Juniperis sibirica were recommended.

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Acknowledgments

This research was supported by the Bulgarian National Science Fund (project # DFNI-B02/18).

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  1. Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, 23, Acad. G. Bonchev str., 1113, Sofia, Bulgaria

    Elina Yankova-Tsvetkova, Ivalena Ilieva, Marina Stanilova, Stoyan Stoyanov & Boriana Sidjimova

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  1. Elina Yankova-Tsvetkova
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  2. Ivalena Ilieva
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Correspondence to Elina Yankova-Tsvetkova.

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Yankova-Tsvetkova, E., Ilieva, I., Stanilova, M. et al. Reproductive biology of the endangered Bulgarian endemic Centaurea achtarovii (Asteraceae). Biologia 73, 1163–1175 (2018). https://doi.org/10.2478/s11756-018-0126-2

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