SEPALLATA (SEP) genes are key transcriptional regulators which act as cofactors with other floral organ identity genes during inflorescence development. Duplication events within developmental gene lineages followed by functional partitioning or diversification have likely contributed to the diversification of floral morphologies. To investigate the developmental and evolutionary roles of the SEP genes, LEAFY HULL STERILE1 (LHS1)-like and Oryza sativa MADS5 (OsMADS5), I used phylogenetic, comparative RNA expression and molecular evolutionary analyses. These results demonstrate the LHS1/OsMADS5 gene duplication event occurred at the base of grasses and the gene paralogs LHS1 and OsMADS5 have subsequently been partially subfunctionalized among grass species. Expression data of LHS1-like genes suggest the outer floral whorls of non-grass monocots and the grass palea and lemma, and bracts 6-8 of Streptochaeta are homologous. Additionally these results suggest tubercles evolved in the rice genus and are correlated to a novel insertion in the LHS1 protein sequence.
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 48/02M, Masters Abstracts International|
|Subjects:||Molecular biology, Genetics|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be