Pollen studies in the genus Viola (Violaceae) from Iran

• Pollen morphology of 17 species of Viola representing five sections, Melanium, Plagiostigma, 'Spathulidium' ined., Sclerosium, and Viola, was studied using light and scanning electron microscope. Pollen grains were usually symmetrical, tetrazonocolporate to pentazonocolporate in section Melanium and trizonocolporate to tetrazonocolporate in the other four sections. Pollen shape was circular to subtriangular, tetragonal or pentagonal in polar view and prolate to oblate, spheroidal or pyramidal in equatorial view. Exine ornamentation was granulate, psilate and mostly perforate. The psilate type was only observed in V.modesta. We found heteromorphy in aperture number in V.caspia of section Viola, V.occulta of section Melanium and V.behboudiana of section Sclerosium, which corroborates their higher ploidy than in related species (octoploid versus tetraploid).

Ämnesord

NATURVETENSKAP  -- Biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Nyckelord

Exine

morphology

ornamentation

palynology

pollen

Viola

NORTH-AMERICAN

HETEROMORPHISM

EVOLUTION

GNOT A

1994

ACTA BOTANICA GALLICA

V141

P109

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