Poster: Genome evolution

Abs # 849: Anionic peroxidase genes in ancestral species of tobacco display unique genome organization

Presenter:	Jacob, Nitya P, njacob@emory.edu
Authors	Jacob, Nitya P (A) (B)  Nelson, Scott  (B)   Malmberg, Russell  (C)
Affiliations:	(A): Oxford College of Emory University (B): Knox College (C): University of Georgia

Nicotiana tabacum is an allotetraploid formed by the hybridization of N. sylvestris and N. tomentosiformis. Two genes, Tpod and Spod, encoding anionic peroxidase are found in N. tabacum. Spod originates from N. sylvestris and Tpod originates from N. tomentosiformis. Comparison of genomic DNA shows that the two genes are distinct in their organization. Spod contains three introns while Tpod contains two introns. Lengths and positions of the introns differ between the two genes. The Spod promoter region carries several regulatory elements not present in Tpod. Genomic organization of Spod and Tpod are compared to anionic peroxidases from other plant species. Significance of these genes in tracing the polyploid history of N. tabacum is discussed.