アオイ科の花粉粒外部形態

概要

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Scanning electron microscopic observation was made of the morphology of pollen grains of 17 species of the family Malvaceae. The pollen grains of the family Malvaceae are globular and large-sized, and they have peculiar spinous process. According to the number, size and shape of the spines, the pollen grains are classified into three types: a type of multi-forate grain such as Althaea rosea, a type of multi regular-shaped grain such as Hibiscus mutabilis, and tricolpate grain type such as Abutilon avicennae. Since the process characteristic of spinous pattern have a specific shape to each type, the shape of process can be used as one of the standard items for the classification of the pollen grains. A characteristic reticular patterns were detected on the pollen surface by highly magnified photomicroscope. In order to prepare a specimen for scanning electron microscope, a carbonization method was tried on pollen grains. Following gradual heating, carbonization was carried at approximately 650℃. Thus, a clearer structure of the wall of pollen grain was observed by this method than the conventional section method. Out of the pores dispersed on the surface; their contents were shooting. These pores seem to turn into germinal pores. The sizes of the spinous patterns were variable. Some of smaller patterns were found to be gradually growing and also, a growing process of the scale-like pattern can be observed.
1993-11-01