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King Abdulaziz University (2020)

EFFECTS OF OZONE ON PHYSIOLOGY, GROWTH AND YIELD OF BEAN (VICIA FABA L.) PLANTS

ZAGZOOG, TAGREED Mohammed

Titre : EFFECTS OF OZONE ON PHYSIOLOGY, GROWTH AND YIELD OF BEAN (VICIA FABA L.) PLANTS

Auteur : ZAGZOOG, TAGREED Mohammed

Université de soutenance : King Abdulaziz University

Grade : Master Thesis 2020

Résumé
Ground-level ozone O3 is documented as one of the most phytotoxic secondary air pollutants. No doubts that O3 causes much morphological and physiological damage on the plant crop productivity. In general, air pollutant that harmfully impacts the ecosystem. O3 is entering leaves through the stomata, generating other ROS and causing oxidative stress, which in turn decreases photosynthesis, plant growth, and biomass accumulation. Therefore, this is lowering the economic value of the crops. Thus, the food economy will be affected. The aim of this study is to conducte further insight about the physiological and biochemical response of bean (Vicia faba L.) plants when exposed to realistic levels of O3 similar to ambient concentrations throughout the plants life cycle. This study was during February - April 2018, in Jeddah city. It was in two closed fumigation chambers were plants exposed to fumigation O3 50 ppb and filtered-air FA from seedling, (8 h day-1, from 8am to16pm) for 70 days. Photosynthesis and stomatal response were measured by portable Infra-Red Gas Analyzer. Growth was measured, different pigments and antioxidant enzymes were analyzed also. The results of O3 exposure showed a negative effects compared to controlled treatment by increased visible foliar injuries 97%, significant reductions in the number of flowers 33%, number of leaves 65%, the photosynthetic rate A 42%, stomatal conductance activity gs 59%, leaf pigments contents Chl a 68%, Chl b 57%, carotenoid 70%, and total Chl 64% while had increased activity of GR, CAT, SOD, and H2O2.That which were reflected in lower growth and yield of (Vicia faba L.) plants. This study focuses on the harm effects of environmental pollution on plant growth and development and we must decrease air pollutions for obtaining healthy plants. The study is in line with Saudi Arabia Vision 2030 focus on environmental pollution factors maintaining for a sustainable environment.

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Page publiée le 14 mars 2022