Pollen morphology of some species of solanum and jaltomata (tribe solaneae, solanaceae)

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Abstract

The pollen morphology of 14 species of the tribe Solaneae (Solanaceae) was studied by light and scanning electron microscopy, of which the pollen of 10 species was described for the first time. The pollen morphology of previously described species is compared with our data. The validity of the inclusion of the previously isolated genera Lycopersicon and Cyphomandra in the genus Solanum, as well as the genus Hebecladus in the genus Jaltomata, is confirmed on the basis of the morphological structure of their pollen grains. Typical pollen grains of the studied species are 3-colporate, spheroidal, medium-sized, the equatorial diameter does not exceed 35 µm. Colpi are long, narrow, and the structure of endoaptures is different. The sculpture of the pollen grain surface is echinate. Pollen grains of genus Solanum are characterized by a 3-lobate outline in polar view, strongly elongated endoapertures with clear equatorial edges, and high density of spinules on pollen grain surface. Pollen grains of the genus Jaltomata are always characterized by a strictly rounded shape in polar view, endoapertures are rounded and weakly pronounced, pollen sizes, structure of apertures and sculpture of pollen grain surface are individualizing features for some of the studied species.

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About the authors

A. N. Semenov

V. L. Komarov Botanical Institute of the Russian Academy of Sciences

Author for correspondence.
Email: undreru@yandex.ru
Russian Federation, St. Petersburg

D. A. Britskiy D. A. Britskiy D. A. Britskiy

V. L. Komarov Botanical Institute of the Russian Academy of Sciences

Email: dmibri@mail.ru
Russian Federation, St. Petersburg

V. F. Tarasevich

V. L. Komarov Botanical Institute of the Russian Academy of Sciences

Email: tarasevichvf@mail.ru
Russian Federation, St. Petersburg

O. A. Gavrilova

V. L. Komarov Botanical Institute of the Russian Academy of Sciences

Email: gavrilova@binran.ru
Russian Federation, St. Petersburg

V. V. Grigorieva

V. L. Komarov Botanical Institute of the Russian Academy of Sciences

Email: mikhailov_val@mail.ru
Russian Federation, St. Petersburg

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2. Fig. 1. Pollen morphology of Solanum and Jaltomata (LM). 1—4 — Solanum sycocarpum; 5—8 — S. obliquum; 9—12 — S. diploconos; 13—16 — S. sciadostylis; 17—20 — S. bonariense; 21—24 — Jaltomata procumbens; 25—27 — J. umbellata. 1, 2, 5—7, 9—11, 13—15, 17—19, 21, 22, 25, 26 — equatorial view of pollen grains. 3, 4, 8, 12, 16, 18, 20, 23, 27 — polar view of pollen grains. 24 — atypical pollen grain, polar view. Scale bars, μm: 1—27 — 10.

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3. Fig. 2. Pollen morphology of Solanum (SEM). 1–3 — Solanum lasiopodium; 4–6 — S. diploconos; 7–9 — S. sciadostylis; 10–12 — S. bonariense. 1, 4, 10 — polar view of pollen grains. 2, 5, 7, 8, 11 — equatorial view of pollen grains. 3, 6, 9, 12 — exine sculpture. Scale bars, μm: 1, 2, 4, 5, 7, 8, 10, 11 – 5; 3, 6, 9, 12 – 1.

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4. Fig. 3. Pollen morphology of Solanum and Jaltomata (SEM). 1–3 — Solanum lycopersicum; 4–6 — S. habrochaites; 7–9 — Jaltomata procumbens; 10–12 — Jaltomata umbellata. 1, 4, 7, 10 — polar view of pollen grains. 2, 5, 8, 11 — equatorial view of pollen grains. 3, 6, 9, 12 — exine sculpture. Scale bars, μm: 1, 2, 4, 5, 7, 8, 10, 11 – 5; 3, 6, 9, 12 – 1.

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