Understanding the role of Light Responsive BTBs E3 ubiquitin ligases (LRBs) in ABAmediated regulation of seed germination in Arabidopsis thaliana L.

Pal, Kunal (2022) Understanding the role of Light Responsive BTBs E3 ubiquitin ligases (LRBs) in ABAmediated regulation of seed germination in Arabidopsis thaliana L. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS dissertation of Kunal Pal (17MS139)) 17MS139_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (6MB)

Abstract

Seed germination is one of the most important developmental processes in the life cycle of a plant. Different plant hormones regulate seed germination via a complex web of networks. Genetic screenings aimed at identifying critical components of the hormone signaling pathways have provided advances in understanding the different aspects of plant hormones' functions and their interactions. Abscisic acid (ABA) is the major plant hormone responsible for regulating seed dormancy. This ABAinduced dormancy is required for the proper development of seeds. ABA also regulates different aspects of plant growth development and abiotic stress responses. Notably, these crucial ABA functions are conserved in the plant kingdom. This ABA-mediated seed dormancy is highly regulated by several different factors consequence of which there is complexity in determining the molecular mechanisms controlling the dormancy. Environmental factors are also responsible for genetic variation in seeds affecting their dispersal and germination behaviour. E3 ubiquitin ligases are diverse regulators within various signaling pathways. They act by targeting substrate proteins for ubiquitylation and then proteolytic degradation. We are trying to understand the role of LRB E3 ubiquitin ligases in the regulation of seed germination. LRBs are involved in the temperature-mediated regulation of hypocotyl elongation. This study has characterized all three members of LRBs in seed development and seed germination. The emerging contrast among them has provided opportunities to explore other possible missing links in ABA signaling pathways and dormancy-related pathways. Due to current changes in environmental conditions and global warming, there is a need to develop a better insight regarding molecular mechanisms affecting germination and plant growth. This knowledge will significantly help study drought, salt tolerance, and other stress responses to develop the drought-tolerant crop.

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