Developmental stages of the pollen wall and tapetum in Ash tree (Fraxinus excelsior) to Climatic factors

Local climate changes can impact on a number of factors have been shown to influence both the development and attacks of allergic respiratory diseases and may affect the quality and amount of airborne pollen grains especially allergenic pollens. One of the most distinctive features of the anemophilous pollen grains such as ash tree is the pollen wall.In this research, investigate the microsporogenesis, tapetum and pollen wall development in Fraxinus excelsior in Tehran.