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Gynodioecy of Origanum vulgare ssp. gracile (Lamiaceae) in Tajikistan
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  • Vladimir Godin,
  • Aleksey Astashenkov,
  • Vera Cheryomushkina,
  • Kobil Bobokalonov
Vladimir Godin
Central Siberian Botanical Garden of the Siberian Branch of the Russian Academy of Sciences

Corresponding Author:[email protected]

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Aleksey Astashenkov
Central Siberian Botanical Garden of the Siberian Branch of the Russian Academy of Sciences
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Vera Cheryomushkina
Central Siberian Botanical Garden of the Siberian Branch of the Russian Academy of Sciences
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Kobil Bobokalonov
Institute of Botany Plant Physiology and Genetics of the National Academy of Sciences of Tajikistan
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Abstract

Gynodioecy has been identified to occur in the herbaceous polycarpic Origanum vulgare ssp. gracile growing in Tajikistan and is here described in detail for the first time. The investigated populations of O. vulgare ssp. gracile form two types of flowers, perfect and pistillate, on different individuals. In pistillate flowers, stamens are represented by staminodes. The size of many parts of the corolla and androecium of perfect flowers is significantly larger than in pistillate flowers. Four criteria have been identified that make it possible to reliably distinguish flowers of different sexual forms: the size of the corolla and its parts, the difference between calyx tube length versus corolla tube length, the position of the anthers, and the rate of development of stamens. Perfect flowers are characterized by strictly pronounced protandry. According to the pollen/ovule ratio (from 825 to 953), O. vulgare ssp. gracile is facultatively xenogamous. Hermaphrodites predominated (from 58.9% to 76.2%) in five of the investigated populations. The frequency of females in O. vulgare ssp. gracile was shown to be most dependent on annual precipitation (Bio12). Finally, we discuss the presence and distribution of gynodioecy within the genus Origanum and its adaptive significance for the existence of populations of O. vulgare ssp. gracile.
29 Jun 2023Submitted to Nordic Journal of Botany
30 Jun 2023Submission Checks Completed
30 Jun 2023Assigned to Editor
30 Jun 2023Review(s) Completed, Editorial Evaluation Pending
20 Jul 2023Reviewer(s) Assigned
14 Sep 2023Editorial Decision: Revise Major
26 Sep 20231st Revision Received
05 Oct 2023Submission Checks Completed
05 Oct 2023Assigned to Editor
05 Oct 2023Review(s) Completed, Editorial Evaluation Pending
23 Oct 2023Editorial Decision: Accept