Differential expression of duplicated peroxidase genes in the allotetraploid Brassica napus

Gene redundancy due to polyploidization provides a selective advantage for plant adaptation. We examined the expression patterns of two peroxidase genes ( BnPOX1 and BnPOX2) in the natural allotetraploid Brassica napus and the model diploid progenitors Brassica rapa (Br) and Brassica oleracea (Bo) i...

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Published in:Plant physiology and biochemistry 2009-07, Vol.47 (7), p.653-656
Main Authors: Zhao, Jianwei, Buchwaldt, Lone, Rimmer, S. Roger, Brkic, Myrtle, Bekkaoui, Diana, Hegedus, Dwayne
Format: Article
Language:English
Subjects:
Ascomycota
Biological and medical sciences
Brassica napus
Brassica napus - genetics
Brassica napus - metabolism
Fundamental and applied biological sciences. Psychology
Gene Expression
Gene Expression Regulation, Plant
Genes, Duplicate
Genes, Plant
Multigene Family
Peroxidase
Peroxidase - genetics
Peroxidase - metabolism
Plant Diseases - genetics
Plant Diseases - microbiology
Plant physiology and development
Plant Structures
Polyploidization
Polyploidy
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Summary:Gene redundancy due to polyploidization provides a selective advantage for plant adaptation. We examined the expression patterns of two peroxidase genes ( BnPOX1 and BnPOX2) in the natural allotetraploid Brassica napus and the model diploid progenitors Brassica rapa (Br) and Brassica oleracea (Bo) in response to the fungal pathogen Sclerotinia sclerotiorum. We demonstrated that the Bo homeolog of BnPOX1 was up-regulated after infection, while both BnPOX2 homeologs were down-regulated. A bias toward reciprocal expression of the homeologs of BnPOX1 in different organs in the natural allotetraploid of B. napus was also observed. These results suggest that subfunctionalization of the duplicated BnPOX genes after B. napus polyploidization as well as subneofunctionalization of the homeologs in response to this specific biotic stress has occurred. Retention of expression patterns in the diploid progenitors and the natural allotetraploid in some organs indicates that the function of peroxidase genes has been conserved during evolution.
ISSN:0981-9428
1873-2690
DOI:10.1016/j.plaphy.2009.03.002