Aerobiology and allergenicity ofpinus radiatapollen in new zealand

Abstract

An early Pinus season distinct from other airborne pollen grains is a feature of New Zealand pollen aerobiology. Its significance to health is uncertain as Pinus is generally considered not a potent allergenic pollen. Of proteins released by pollen of Pinus radiata upon hydration however, several IgE-binding species have been detected and incubation of human atopic IgE-rich serum with pollen extracts reduces subsequent IgE binding to ryegrass allergen RAST discs. The possibility of partial cross-allergenicity between Pinus and ryegrass is raised. In addition to proteins, low molecular weight compounds are also released by pine pollen. Amongst these are benzoic acid and 4-hydroxy benzoic acid. These substances, released in μg/g pollen quantities, are known to possess pharmacological activity and to adversely affect a low proportion of the population.