Date of Award
Master of Science (MS)
Khaled A. El-Tarabily
Tomato (Solanum lycopersicum) is one of the most popular vegetables in the world, including the United Arab Emirates (UAE). Salinity is a global menace to plant growth and development, causing significant economic losses to tomato and other crop plants. It is well-known that 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase (ACCD) can increase plant tolerance to environmental stresses. This can be attributed to the increased activity of the enzyme ACCD, which breaks down ACC [the immediate precursor of ethylene (ET)] to ammonia and α-ketobutyrate, to lower the overproduction of ET levels in planta and to reduce the damages caused by salt stress. Consequently, the application of beneficial actinobacteria was assessed to alleviate the destructive effects of salt stress on tomato plants. The main objective of this project was to isolate and apply ACCD-producing actinobacteria with increased salt tolerance to relieve any stress on tomato plants cultivated under high salt conditions. Four hundred ninety-one actinobacteria were isolated from the rhizosphere soils of Sweihan area in Abu Dhabi-UAE. In vitro screening demonstrated that three actinobacterial isolates produced ACCD, while tolerating up to 8% NaCl. In the greenhouse, the most promising ACCD-producing isolate (referred to as +ACCD isolate) significantly (P
Elbadawi, Alaa Ahmed Abbas, "RHIZOSPHERE-COMPETENT ACTINOBACTERIAL ISOLATES WITH ACC DEAMINASE ACTIVITY ALLEVIATE SALT STRESS IN TOMATO PLANTS IN THE UAE" (2022). Biology Theses. 40.