Date of Award
5-2005
Degree Type
Thesis
Degree Name
M.S.
Degree Program
Biological Sciences
Department
Biological Sciences
Major Professor
Triplett, Barbara A.
Second Advisor
Timpte, Candace
Third Advisor
Kim, Hee Jin
Fourth Advisor
Clancy, Mary
Abstract
Rop/Rac proteins are plant-specific monomeric guanosine triphosphate-binding proteins (G-proteins) with important functions in plant development. Until recently, only three cotton (Gossypium hirsutum) Rop/Rac G-protein genes were sequenced, representing subfamilies III and IV of the plant monomeric Gprotein family. In this project, members of subfamilies II and I were cloned, sequenced, and named GhRac2 and GhRac3, respectively. Using real-time reverse transcription PCR, expression of GhRac2 was highest during fiber elongation, decreasing significantly when cellulose biosynthesis began. Transcript abundance of GhRac3 doubled between fiber elongation and secondary wall synthesis, remaining constant until 20 days post-anthesis. Expression of GhRac2 and GhRac3 was compared between the unfertilized ovules of Gossypium hirsutum, Texas Marker 1 and two near-isogenic fiber-impaired mutants. Expression of GhRac2 and GhRac3 was significantly higher in wild type ovules than in Ligon lintless, a mutant impaired in fiber elongation, but was not different in Naked Seed, a mutant impaired in fiber initiation.
Recommended Citation
Asprodites, Nicole, "The Cloning and Characterization of Two ROP/RAC G-Proteins from Gossypium Hirsutum" (2005). University of New Orleans Theses and Dissertations. 233.
https://scholarworks.uno.edu/td/233
Rights
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