On the Reproductive Biology of Alkanna tinctoria (Boraginaceae)

Authors

  • Elina Yankova-Tsvetkova Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences
  • Petka Yurukova-Grancharova Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences
  • Rozalia Nikolova Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences

DOI:

https://doi.org/10.7546/CRABS.2022.07.08

Keywords:

Alkanna tinctoria, Boraginaceae, embryology, pollen and seed viability, reproductive capacity

Abstract

In the present study main parameters of reproductive biology as features of embryological structures and processes as well as the pollen and seed viability of Alkanna tinctoria, an endangered useful species of Bulgarian flora were established. In its studied Bulgarian populations pollen viability above 90% and seed viability – between 32% and 64% were determined. The anthers are tetrasporangiate and their wall develops according to Dicotyledonous-type, consisting of an epidermis, fibrous endothecium, an ephemeral middle layer and secretory tapetum. The microsporogenesis is simultaneous and in the anthers tetrahedral and isobilateral microspore tetrads are formed. The mature pollen is threecelled at shedding stage. The ovule is anatropous, teniunucellate, unitegmic. Embryo sac (ES) develops according to the Polygonum (monosporic)-type. The embryo development follows the Asterad-type. The endosperm in the mature seeds has been completely consumed. As a result of the present study A. tinctoria is characterized as a sexually reproducing species.

Author Biographies

Elina Yankova-Tsvetkova, Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences

Mailing Address:
Institute of Biodiversity and Ecosystem Research,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 23
1113 Sofia, Bulgaria

E-mail: e_jankova@abv.bg

Petka Yurukova-Grancharova, Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences

Mailing Address:
Institute of Biodiversity and Ecosystem Research,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 23
1113 Sofia, Bulgaria

E-mail: y_grancharova@abv.bg

Rozalia Nikolova, Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences

Mailing Address:
Institute of Biodiversity and Ecosystem Research,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 23
1113 Sofia, Bulgaria

E-mail: rozalianikolova23@gmail.com

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Published

29-07-2022

How to Cite

[1]
E. Yankova, P. Grancharova, and R. Nikolova, “On the Reproductive Biology of Alkanna tinctoria (Boraginaceae)”, C. R. Acad. Bulg. Sci. , vol. 75, no. 7, pp. 1000–1008, Jul. 2022.

Issue

Section

Biology