Variability in protein content of pollen of Castor bean (Ricinus communis) before and after exposure to the air pollutants SO {rm _{2}} and NO {rm _{2}}
1. Aerobiology &2. Allergy Laboratory, Institute of Genomics and Integrative Biology (f. Centre for Biochemical Technology) , Delhi University Campus;3. Department of Botany , Delhi University , Delhi 110007, India