Physiological and Yield Responses of Spring Wheat Cultivars under Realistic and Acute Levels of Ozone
Tropospheric ozone (O<sub>3</sub>) is widely recognized as the cause of substantial yield and quality reduction in crops. Most of the previous studies focused on the exposure of wheat cultivars to elevated O<sub>3</sub> levels. Our main objectives were to: (i) investigate the...
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| Auteurs principaux: | , , |
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| Format: | article |
| Langue: | EN |
| Publié: |
MDPI AG
2021
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| Accès en ligne: | https://doaj.org/article/bbdd3947ab3b45e0b85b3b6565c7fa9f |
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| Résumé: | Tropospheric ozone (O<sub>3</sub>) is widely recognized as the cause of substantial yield and quality reduction in crops. Most of the previous studies focused on the exposure of wheat cultivars to elevated O<sub>3</sub> levels. Our main objectives were to: (i) investigate the consistency of wheat cultivars’ physiological responses across two different realistic O<sub>3</sub> levels; and (ii) compare these physiological responses with those under short acute O<sub>3</sub> exposure. Three commercially available hard spring wheat cultivars bred under semiarid and Eastern Mediterranean conditions were exposed to two different O<sub>3</sub> levels during two consecutive seasons (2016–2018)—36 and 71 ppbv 7 h mean O<sub>3</sub> mixing ratios in open-top chambers. The results were compared to those following short acute O<sub>3</sub> exposure (102.8 ppbv, 7 h mean for 10 days) in a greenhouse. Non-stomatal responses were significantly more pronounced than stomatal responses in all cultivars under different levels of O<sub>3</sub>. The specific cultivar was observed as the most O<sub>3</sub>-tolerant under all experiments. The fact that the same cultivar was found remarkably tolerant to the local semiarid ambient conditions according to other studies and to O<sub>3</sub> exposure based on the present study supports a link between cultivar resistance to drought conditions and O<sub>3</sub>. |
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