Abstract
There are a limited number of types of airborne pollen with can cause pollinosis. It is well known that such pollens contain antigenic substances that are firstly produced in large amounts. Based on a study using electron microscopy (EM), we postulate that pollinosis is caused by morphological characteristics of pollen grains. Methods: Over a Period of one year in Beijing, we investigated all airborne pollens including trees, and their distribution in each month(1990). Summary: The projections from the bodies, outer wall of the pollen grains could be classified as granular, crest, biting, small-needle, short-needle, sharp-needle, villous, or hooked types club cudgel. Pollen grains with a small sharp needle form, short superficial and solid, thick or columnar interiors of outer wall seem to be more likely to invade the nasal mucosa, causing nasal allergy. On the basis of an electron microscopic analysis of pollen grains, the author has proposed a new theory of tree's pollinosis which had not been report in all country.
