A Study on the Pollen Morphology of Actinidiaceae and Its Systematic Position

Abstract

Abstract:

1. The pollen morphology (Table 2) of 23 species and 3 genera (Actinidia, Cle-

matoclethra and Saurauia) were examined under microscope. Among them 10 species were also

observed under SEM and 3 species also under TEM. Comparative studies on the Actinidiaceae

and its relative families, Theaceae (9 species and 7 genera) and Clethraceae (1 species and 1

genus), were also made.

2. The observation (Table 3) shows that Saurauia differs from Actinidia and Clematoclethra

in a number of important features. Hutchinson's and Takhtajan's systems suggest that Saurauia-

ceae is an independent family, and the observation by the present author is in accord with this

view. Pollen morphology also shows the close relationship between Actinidia and Clematocle-

thra, and therefore they belong to the same family, Actinidiaceae.

3. The comparative analysis of morphological, palynological, embryological and chemical data

(Table 4) may shed light on systematic position of Actinidiaceae. There are several morpholo-

gical similarities between Actinidiaceae and Theaceae: flowers hypogynous, syncarpous, and mo-

stly with free petals; aestivation of sequals quincuncial; gynoecia composed of 3 to many carpels;

styles united or free; placentation mostly axile, ovules numerous; stamens basifixed or versatile;

anthers with a prominent endothecium; fruits often baccate or capsular; and pollen tricolporoi-

date. In Actinidiaceae, however, the ovule is unitegmic, endosperm-development cellular, weak

terminal haustoria developing at both ends of the embryo sac. The embryological characteris-

tics of the family under discussion are similar to those of Cletheraceae. With systematic po-

sition of the family Actinidiaceae, we tend to support Cronquist's view (1981). The embryolo-

gical similarity shows that they are closely related to each other. It is quite possible that Acti-

nidiaceae was derived from the ancestor of the Theaceae, and from the ancestor of Actinidia-

ceae the family Clethraceae was derived.

Key words: Actinidiaceae, Theaceae, Theales, 3-colporate, 3-colporoidate, Os, embryology

Zhang Zhi-Yu. A Study on the Pollen Morphology of Actinidiaceae and Its Systematic Position[J]. .

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A Study on the Pollen Morphology of Actinidiaceae and Its Systematic Position

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