Understanding the cytokinin N-glucosylation pathway using Arabidopsis Mutants
Date of Completion
January 2009
Keywords
Agriculture, Horticulture|Biology, Plant Physiology
Degree
Ph.D.
Abstract
N-glucosylation is considered to be a cytokinin inactivation mechanism in plants. We have isolated a mutant in Arabidopsis thaliana, roscovitine-resistant (ror-1) using T-DNA tagged lines that may encode a gene that plays a role in cytokinin N-glucosylation. The amount of N-glucosides was 20% more in ror-1 mutant compared to WT. The cytokinin oxidase activity showed an 11% increase in ror-1 compared to WT in basal media. Additionally, ror-1 plants showed resistance to exogenously supplied aromatic cytokinins (benzyladenine). Our data on relative expression of ROR-1 gene exhibited significant upregulation of ROR-1 gene in ror-1 plants incubated with 5 μM BA for 24 h. The in silico analysis showed that ROR-1 gene encoded a protein consisting of GRAM (Glycosyltransferases Rab-like GTPase activators and Myotubularins) and C2 domains. Here, we report that the ROR-1 gene plays a role in metabolizing active cytokinin pool in plants by specifically affecting aromatic cytokinin metabolism. ^
Recommended Citation
Dwivedi, Somya, "Understanding the cytokinin N-glucosylation pathway using Arabidopsis Mutants" (2009). Doctoral Dissertations. AAI3351330.
https://digitalcommons.lib.uconn.edu/dissertations/AAI3351330