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Trioecy in Flowering Plants

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Abstract

Populations of trioecious plants consists of individuals with staminate, pistillate, and hermaphrodite flowers. Trioecy is extremely rare in angiosperms, and relevant data are scarce. A list of trioecious plants found in the global flora was compiled on the basis of literature data and original research. The list includes 80 species of 46 genera, which represent 33 families and 21 orders of flowering plants. Trioecy is found in 7.9% of families, 0.3% of genera, and 0.03% of species in angiosperms. Trioecious species are now unknown in basal angiosperms, uncommon in magnoliids, and rather rare in monocots. The overwhelming majority (87.5%) of trioecious plants belong to Superrosids (30 species) and Superasterids (40 species). The greatest numbers of trioecious species are found in the families Rosaceae (nine species of two genera), Caprifoliaceae (seven species of one genus), Scrophulariaceae (seven species of one genus), Caryophyllaceae (six species of two genera), and Celastraceae (six species of two genera). Almost half of the identified trioecious species represent five genera: Fragaria L. (eight species), Valeriana L. (seven species), Buddleja L. (seven species), Maytenus Molina (five species), and Silene L. (five species). An association with trioecy was analyzed for several biological and ecological factors, such as the life form, the method of pollination, the perianth color, the pericarp consistency, the presence of related dioecious species in the same genus, the latitudinal position, and the distribution through floristic phytochoria. A lability of sex differentiation in certain trioecious plants, the proportion of sex forms in a population, a possible association with polyploidy, and mechanisms of trioecy maintenance and evolution in flowering plants are discussed.

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  1. Moscow Pedagogical State University, Moscow, Russia

    V. N. Godin

  2. Central Siberian Botanical Garden, Novosibirsk, Russia

    V. N. Godin

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In memoriam Evgeniya Ivanovna Demyanova (1936–2020), my teacher in the field of plant sexual polymorphism

Translated by T. Tkacheva

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Godin, V.N. Trioecy in Flowering Plants. Dokl Biol Sci 507, 301–311 (2022). https://doi.org/10.1134/S0012496622060023

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