Pollen Morphology of Four Selected Species in the Annonaceae

doi:10.3724/SP.J.1143.2012.12044

Abstract

Abstract:

Pollen grains of four species representing four genera of Annonaceae were examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The pollen grains are tetrads in Annona muricata and Pseuduvaria trimera under SEM. The type of tetrad is various, being tetragonal, rhomboidal, Tshaped, decussate and tetrahedral. The sculpture of pollen in A.muricata is psilate and foveolate, but rugulate in P.trimera. The pollen grains are monad in Oncodostigma hainanense and Uvaria macclurei. In the former species, the ornamentation is rugulate, and in the latter it is coarsely folded. Under TEM, the tectum is thick and continuous in O.hainanense and U.macclurei. The materials from infratectal layer are less accumulated. There is an intermediate infratectal layer in O.hainanense, for some irregular columellae and sparse granules are both observed, but there is a granular infratectal layer in U.macclurei. Basal layer consists of an outer layer and a foliated inner layer. The outer layer is thick, and flat or fluctuant. The inner layer is composed of two to four foliations. The morphological differences are great among different genera or different species in the same genus, indicating a high diversity of pollen morphology in Annonaceae. There are both primitive and derived characters in O.hainanense or P.trimera. Such as in P.trimera, small size pollen grain and imperforate tectum are primitive characters, but tetrad and columellar infratecal layer are derived.

Key words: Annonaceae, Pollen morphology, Ultrastructure, Tetrad, Monad

CLC Number:

Q 944

LIU Yong, XU Feng-Xia. Pollen Morphology of Four Selected Species in the Annonaceae[J]. Plant Diversity, 2012, 34(5): 443-452.

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