Pollen Morphology of the Subtribe Hyoscyaminae (Solanaceae)

Abstract

Abstract:

The pollen morphology of 12 species representing 6 genera was exami-

ned under the light; scanning and transmission electron microscope. According to form of

aperture; sculpture and structure of exine; the palynological relationships among the 6 gene-

ra are discussed.

1. Scopolia Jacq. (plate 1:1-4)

Pollen grains subspheroidal or irregular; 43.7-49.6 μ in diameter; nonaperturate; Exi-

ne about 1.2-1.5μ thick; verrucate; with verrucae unequal in size; spinulose or granular.

Stratification indistinct; with no columella layer visible under TEM.

2. Anisodus Link et Otto (plate 1: 5-12)

Pollen grains subspheroidal; 43.4-48.7 μ in diameter; nonaperturate. Exine 1.5-1.8 μ

thick; verrucate; with verrucae unequal in size; spinulose or smooth. Stratification indis-

tinct under TEM.

3. Atropanthe Pascher (plate 2: 1-4)

Pollen grains subspheroidai or spheroidal; triangular-circular in polar view; oblong in

equatorial view; 47.2-49.3 μ ×39.8-47 μ; 3-colpate; colpi wide or narrow; colpus membra-

nes finely granular. Exine with irregular short-stick sculpture; 2.3μ thick; distinctly 2-la-

yered; columella layer clearly visible; sexine thicker than nexine under TEM.

4. Przewalskia Maxim. (plate 2: 5-8)

Pollen grains subspheroidal; triangular-circular in polar view; oblong in equatorial view;

39.2-40.3 μ × 36.4-42.8 μ ; tricolporate; ora lalongate; colpus membranes granular. Exi-

ne reticulate; 2-layered; 2u thick; columella layer distinct; sexine and nexine equal in thick-

ness under TEM.

5. Physochlaina G. Don (plate 2: 9-12; plate 3: 1-12)

Pollen grains polymorphic; usually subspheroidal; 36.5-39.4μ in diameter; aperture

varying from nonaperturate (P. macrophylla); 3-4 rugose (P. physaloides) to 3-colporate

(P. praealta). Exine 1.5-2μ thick; reticulate; smooth or with spinulose or verrucous pro-

cesses under SEM; distinctly 2-layered; or without stratification; columella layer differentia-

ted or not.

6. Hyoscyamus Linn. (plate 4: 1-9)

Pollen grains subspheroidal; circular-triangular in polar view; oval in equatorial view;

39.9-41.8 μ × 38.7-4.2 μ; tricolporate. Ora orbicular; colpus membranes finely granular

or with striate processes. Exine reticulate or striate-rugulate; 2-2.3μ thick; distinctly 2-la-

yered; columella layer developed.

The dendrogram (Fig. 1) indicates probable phylogenetic relationships among the six

genera in the subtribe Hyoscyaminae.

Key words: Scopolia, Anisodus, Atropanthe, Przewalskia, Physochlaina, Hoyscyamus, Microstructure, Ultrastr-ucture.

Zhang Zhi-Yu, Lu An-Ming. Pollen Morphology of the Subtribe Hyoscyaminae (Solanaceae)[J]. .

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Pollen Morphology of the Subtribe Hyoscyaminae (Solanaceae)

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