Pollen Morphology of Ribes L. and Its Taxonomic Significance

Abstract

Abstract:

The pollen morphology of 19 species and 2 varieties in the genus Ribes Linn. was

examined under light microscope (LM) and scanning electron microscope (SEM).

Pollen grains of the genus are subspheroidal, 15.0-41.67 μm in diameter, more or less

circular to obtusely quadrangular in outline with all sides slightly concave, or with alternating

concave sides, or elliptic under SEM, 5-, 6-zonocolporate or 5-, 6-pantoporate. Exine

usually thin, 1.0-1.5μm, without visible differentiation between nexine and sexine. Exine is

psilate or sometimes coarsely or finely granular or verrucate.

The most important characteristic of pollen in this genus is the presence of a “rugoid

Area” (ectoaperture) around the endoaperture under SEM. It is different from the other taxa

of Saxifragaceae (s. 1.). Based on the pollen morphology and the external morphological char-

acteristics, the treatment of the genus Ribes as an independent family (i.e. Grossulariaceae)

by many taxonomists is reasonable.

The pollen grains of the genus can be divided into 4 types from the materials examined:

(1) Grossularia-type. ectoaperture colpate, with two endoapertures, exine psilate. (2) Ribes-type:

ectoaperture porous or colpate, with one or two endoapertures, exine mostly psilate. (3) Gros-

sularioides-type: ectoaperture porous, circular, small, with one endoaperture, exine verrucate.

(4) Berisia-type: ectoaperture porous, subcircular to circular, large, with one endoaperture ex-

ine mostly psilate. The observation made by the present authors supports the subdivision of

Ribes into the subgenera Grossularia, Ribes, Grossularioides and Berisia by many taxonomists

based on the other morphological characteristics, and the observation by the present authors is

in accordance with this view. Pollen information also shows the close relationships among the

four subgenera and therefore they belong to the same genus — Ribes.

Key words: Ribes, Pollen Morphology, Taxonomy

Huang Pu-Hwa, Ye Wan-Hui. Pollen Morphology of Ribes L. and Its Taxonomic Significance[J]. .

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Pollen Morphology of Ribes L. and Its Taxonomic Significance

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