Unable to connect to database - 04:50:46 Unable to connect to database - 04:50:46 SQL Statement is null or not a SELECT - 04:50:46 SQL Statement is null or not a DELETE - 04:50:46 Botany & Plant Biology 2007 - Abstract Search
Unable to connect to database - 04:50:46 Unable to connect to database - 04:50:46 SQL Statement is null or not a SELECT - 04:50:46

Abstract Detail


Genome Evolution

Menke, S M [1], Henson, B J [1], Barnum, S R [2].

The Evolution of Nitrogen Fixation in Nitrogen Fixing Cyanobacteria Using nifD.

Nitrogen fixation is randomly dispersed throughout prokaryotic lineages raising the question of whether it has been transferred by vertical or lateral transfer, or both. We have used nifD, the gene encoding the alpha-subunit of the enzyme dinitrogenase, to study the evolution of nitrogen fixation in nitrogen fixing cyanobacteria from Subsections I, II, III, IV, and V. DNA sequences were obtained for analysis from representative strains of nonheterocystous strains within Subsection III and combined with sequence data from GenBank. Maximum liklihood was used to obtain phylogenetic trees and compared to 16S rRNA trees. Results show that nifD has evolved through vertical descent for most cyanobacteria with the exception of a possible lateral transfer of the nifD2 gene in Anabaena variabilis. Our data also corroborate previous studies showing that the heterocystous cyanobacteria form a monophyletic lineage within the nonheterocystous cyanobacteria, while the nonheterocystous cyanobacteria are paraphyletic.


Log in to add this item to your schedule

1 - Miami University, Botany
2 - Miami University, Botany, Oxford, Ohio, 45056, USA

Keywords:
nitrogen fixation
nifD
evolution.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P40001
Abstract ID:1048


Copyright 2000-2007, Botanical Society of America. All rights