Effect of nitrogen dioxide and sulfur dioxide on viability and morphology of oak pollen

International Forum of Allergy & Rhinology
Yuhui OuyangLuo Zhang

Abstract

Nitrogen dioxide (NO2) and sulfur dioxide (SO2) generated by excessive coal combustion and motor vehicle emissions are major air pollutants in the large cities of China. The objective of our study was to determine the effects of the exposure of oak pollens (Quercusmongolica) to several concentrations of NO2 or SO2. Pollen grains were exposed to 0.5 ppm to 5.0 ppm NO2 or SO2 for 4 hours and assessed for morphological damage by field emission scanning electron microscopy and for viability using the trypan blue stain. Morphological changes in pollen grains were also examined after contact with acid solutions at pH 4.0 to pH 7.0. Exposure to NO2 or SO2 significantly damaged pollen grains at all concentrations investigated, compared to exposure to air; with exposure to concentrations of 0.5 ppm to 2 ppm resulting in fissures or complete breaks in the exine and a concentration of 5 ppm resulting in complete breakdown and release of pollen cytoplasmic granules. Significantly greater amounts of pollen grain were damaged after exposure to SO2 (15.5-20.4%) than after exposure to NO2 (7.1-14.7%). Similarly, exposure to NO2 or SO2 significantly decreased the viability of pollen grains, compared with exposure to air; with SO2 being slightly...Continue Reading

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Citations

Feb 13, 2016·Environmental Science and Pollution Research International·Nataša Čamprag SaboAleksandar Popović
Jan 11, 2016·International Forum of Allergy & Rhinology·Robert C Kern
May 8, 2016·Environmental Pollution·Oumsaad NaasNicolas Visez
Jan 21, 2019·Allergy, Asthma & Immunology Research·Yuan Zhang, Luo Zhang
Apr 13, 2020·Environmental Science and Pollution Research International·Mengfan YanNai-Jun Tang
Aug 14, 2020·Environmental Science and Pollution Research International·Maria Pilar PlazaCarmen Galán
May 24, 2021·Allergy, Asthma, and Clinical Immunology : Official Journal of the Canadian Society of Allergy and Clinical Immunology·Yuhui OuyangLuo Zhang

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