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Article

Ozone Response of Leaf Physiological and Stomatal Characteristics in Brassica juncea L. at Supraoptimal Temperatures

1
Department of Environmental Horticulture, University of Seoul, Seoul 02504, Korea
2
Department of Geoinformatics, University of Seoul, Seoul 02504, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Sofia Bajocco
Land 2021, 10(4), 357; https://doi.org/10.3390/land10040357
Received: 22 February 2021 / Revised: 19 March 2021 / Accepted: 20 March 2021 / Published: 1 April 2021
(This article belongs to the Special Issue Air Pollution in Urban Areas Impacts on Vegetation and Ecosystems)
Plants are affected by the features of their surrounding environment, such as climate change and air pollution caused by anthropogenic activities. In particular, agricultural production is highly sensitive to environmental characteristics. Since no environmental factor is independent, the interactive effects of these factors on plants are essential for agricultural production. In this context, the interactive effects of ozone (O3) and supraoptimal temperatures remain unclear. Here, we investigated the physiological and stomatal characteristics of leaf mustard (Brassica juncea L.) in the presence of charcoal-filtered (target concentration, 10 ppb) and elevated (target concentration, 120 ppb) O3 concentrations and/or optimal (22/20 °C day/night) and supraoptimal temperatures (27/25 °C). Regarding physiological characteristics, the maximum rate of electron transport and triose phosphate use significantly decreased in the presence of elevated O3 at a supraoptimal temperature (OT conditions) compared with those in the presence of elevated O3 at an optimal temperature (O conditions). Total chlorophyll content was also significantly affected by supraoptimal temperature and elevated O3. The chlorophyll a/b ratio significantly reduced under OT conditions compared to C condition at 7 days after the beginning of exposure (DAE). Regarding stomatal characteristics, there was no significant difference in stomatal pore area between O and OT conditions, but stomatal density under OT conditions was significantly increased compared with that under O conditions. At 14 DAE, the levels of superoxide (O2-), which is a reactive oxygen species, were significantly increased under OT conditions compared with those under O conditions. Furthermore, leaf weight was significantly reduced under OT conditions compared with that under O conditions. Collectively, these results indicate that temperature is a key driver of the O3 response of B. juncea via changes in leaf physiological and stomatal characteristics. View Full-Text
Keywords: Brassica juncea L.; ozone; physiological characteristics; stomatal characteristics; supraoptimal temperature Brassica juncea L.; ozone; physiological characteristics; stomatal characteristics; supraoptimal temperature
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MDPI and ACS Style

Lee, J.K.; Kwak, M.J.; Park, S.H.; Kim, H.D.; Lim, Y.J.; Jeong, S.G.; Choi, Y.S.; Woo, S.Y. Ozone Response of Leaf Physiological and Stomatal Characteristics in Brassica juncea L. at Supraoptimal Temperatures. Land 2021, 10, 357. https://doi.org/10.3390/land10040357

AMA Style

Lee JK, Kwak MJ, Park SH, Kim HD, Lim YJ, Jeong SG, Choi YS, Woo SY. Ozone Response of Leaf Physiological and Stomatal Characteristics in Brassica juncea L. at Supraoptimal Temperatures. Land. 2021; 10(4):357. https://doi.org/10.3390/land10040357

Chicago/Turabian Style

Lee, Jong K., Myeong J. Kwak, Sang H. Park, Han D. Kim, Yea J. Lim, Su G. Jeong, Yun S. Choi, and Su Y. Woo 2021. "Ozone Response of Leaf Physiological and Stomatal Characteristics in Brassica juncea L. at Supraoptimal Temperatures" Land 10, no. 4: 357. https://doi.org/10.3390/land10040357

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