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

Jong Kyu Lee, Myeong Ja Kwak, Sang Hee Park, Han Dong Kim, Yea Ji Lim, Su Gyeong Jeong, Yun Soo Choi and Su Young Woo
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Jong Kyu Lee: Department of Environmental Horticulture, University of Seoul, Seoul 02504, Korea
Myeong Ja Kwak: Department of Environmental Horticulture, University of Seoul, Seoul 02504, Korea
Sang Hee Park: Department of Environmental Horticulture, University of Seoul, Seoul 02504, Korea
Han Dong Kim: Department of Environmental Horticulture, University of Seoul, Seoul 02504, Korea
Yea Ji Lim: Department of Environmental Horticulture, University of Seoul, Seoul 02504, Korea
Su Gyeong Jeong: Department of Environmental Horticulture, University of Seoul, Seoul 02504, Korea
Yun Soo Choi: Department of Geoinformatics, University of Seoul, Seoul 02504, Korea
Su Young Woo: Department of Environmental Horticulture, University of Seoul, Seoul 02504, Korea

Land, 2021, vol. 10, issue 4, 1-22

Abstract: 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 (O 3 ) 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) O 3 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 O 3 at a supraoptimal temperature (OT conditions) compared with those in the presence of elevated O 3 at an optimal temperature (O conditions). Total chlorophyll content was also significantly affected by supraoptimal temperature and elevated O 3 . 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 (O 2 - ), 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 O 3 response of B. juncea via changes in leaf physiological and stomatal characteristics.

Keywords: Brassica juncea L.; ozone; physiological characteristics; stomatal characteristics; supraoptimal temperature (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2021
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