eng Oriental Scientific Publishing Company Biomedical and Pharmacology Journal 0974-6242 2018-06-25 11 2 929 934 10.13005/bpj/1450 20789 article Laila A. Baqasi 1,2 Huda A. Qari 1,2 Nihal Al-Nahhas 3 Reem H. Badr 3 Wafaa K. Taia 3 Rehab A. El-Dakkak 3 Department of Biology, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia. Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, 21589 Jeddah, Saudi Arabia. Department of Botany, Faculty of Science, Alexandria University, 21589 El Shatby, Alexandria, Egypt. Growth, yield, protein content, net photosynthetic rates, stomatal conductance and amino acid profiles were determined in wheat (Triticum aestivum L) plants in response to 50 ppb O₃ during the growing season. This concentration is similar to the concentrations of O₃ in ambient air. O₃ decreased photosynthetic rates (24%) and stomatal conductance (25%), which were reflected in lower growth and yield in terms of number of grains and 100 grain weight. Scanning electron microscopy showed a collapse in the epidermal cells adjacent to stomata that led to stomatal closure and consequently reductions in stomatal conductance. The significance of O₃-induced impairment of growth, yield and alteration in amino acid contents are discussed. To the best of our knowledge, this is the first study reporting impact of ozone on protein content, amino acids and yield of wheat in Saudi Arabia. https://biomedpharmajournal.org/vol11no2/effects-of-low-concentrations-of-ozone-o3-on-metabolic-and-physiological-attributes-in-wheat-triticum-aestivum-l-pants/ Growth Ozone Physiology Wheat Yield