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Evidence of Ozone-Induced Visible Foliar Injury in Hong Kong Using Phaseolus Vulgaris as a Bioindicator

Earth System Science Programme, Faculty of Science, and Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Sha Tin, Hong Kong, China
State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Sha Tin, Hong Kong, China
Centre for Doctoral Training in Environmental Intelligence, University of Exeter, EX4 4PY Exeter, UK
UK Centre for Ecology & Hydrology, Deiniol Road, LL57 2UW Bangor, Wales, UK
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(3), 266;
Received: 18 February 2020 / Revised: 27 February 2020 / Accepted: 1 March 2020 / Published: 7 March 2020
(This article belongs to the Special Issue Biomonitoring of Air Pollution)
(1) Background: Hong Kong is one of the most densely populated cities in the world, with millions of people exposed to severe air pollution. Surface ozone, mostly produced photochemically from anthropogenic precursor gases, is harmful to both humans and vegetation. The phytotoxicity of ozone has been shown to damage plant photosynthesis, induce early leaf death, and retard growth. (2) Methods: We use genotypes of bush bean Phaseolus vulgaris with various degrees of sensitivity to ozone to investigate the impacts of ambient ozone on the morphology and development of the beans. We use ozone-induced foliar injury index and measure the flowering and fruit production to quantify the ozone stress on the plants. (3) Results: We expected that the ozone-sensitive genotype would suffer from a reduction of yield. Results, however, show that the ozone-sensitive genotype suffers higher ozone-induced foliar damage as expected but produces more pods and beans and heavier beans than the ozone-resistant genotype. (4) Conclusions: It is postulated that the high ozone sensitivity of the sensitive genotype causes stress-induced flowering, and therefore results in higher bean yield. A higher than ambient concentration of ozone is needed to negatively impact the yield production of the ozone-sensitive genotype. Meanwhile, ozone-induced foliar damage shows a graduated scale of damage pattern that can be useful for indicating ozone levels. This study demonstrates the usefulness of bioindicators to monitor the phytotoxic effects of ozone pollution in a subtropical city such as Hong Kong. View Full-Text
Keywords: bush bean; sensitive and resistant genotype; ambient ozone bush bean; sensitive and resistant genotype; ambient ozone
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MDPI and ACS Style

Leung, F.; Pang, J.Y.S.; Tai, A.P.K.; Lam, T.; Tao, D.K.C.; Sharps, K. Evidence of Ozone-Induced Visible Foliar Injury in Hong Kong Using Phaseolus Vulgaris as a Bioindicator. Atmosphere 2020, 11, 266.

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