The function and metabolism of ascorbic acid in plants

Matić, Dajana (2014) The function and metabolism of ascorbic acid in plants. Bachelor's thesis, Faculty of Science > Department of Biology.

Language: Croatian

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Ascorbic acid (AsA) is an abundant metabolite in plants, present in all subcellular compartments, that fulfils multiple essential functions in plants. It is a major antioxidant, cofactor for enzymes involved in regulation of photosynthesis, hormone biosynthesis and regeneration of other antioxidants. AsA is implicated in the control of cell division, cell expansion, growth and development including flowering, senescence and root development and also regulates defense response and survival of plants under abiotic and biotic stress. AsA, its redox couple AsA/DHA and related enzymes (MDHAR, DHAR and APX) together form an AsA redox system to efficiently protect plants from oxidative stress caused by exogenous and endogenously-generated ROS and its products. In addition, plants can increase their AsA content as consequence of stress conditions. Multiple AsA biosynthetic pathways are present in plants which reflects the importance of this molecule to plant health. The main one is so called Smirnoff-Wheeler pathway, where L-galactono-1,4-lactone is the immediate precursor of AsA. Because of the complexity of its multiple roles, any attempts to increase AsA content in plants will require close examination of how such changes might impact the overall metabolism and plant development. Furthermore, the knowledge of regulatory mechanisms of AsA metabolism still remains limited and also, it's role in signal transduction needs to be clarified.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Vidaković-Cifrek, Željka
Date: 2014
Number of Pages: 19
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 19 Nov 2014 12:49
Last Modified: 19 Nov 2014 12:49

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