期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 50, 期 -, 页码 24-34出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2011.09.013
关键词
Potato; Endophyte; Burkholderia phytofirmans strain PsJN; MSAP; DNA methylation; Gene expression
资金
- United States Department of Agriculture [2008-38891-19353, 2009-38891-20092]
- Commonwealth of Virginia to the Institute for Advanced Learning and Research
- NIFA [583127, 2009-38891-20092, 581562, 2008-38891-19353] Funding Source: Federal RePORTER
Burkholderia phytofirmans strain PsJN is a highly effective plant-beneficial endophyte. We have used a combination of capillary electrophoresis and methylation-sensitive amplification length polymorphism (CE-MSAP) analysis to investigate the potato genomic DNA cytosine methylation changes that occur in response to PsJN bacterization. Six weeks after PsJN inoculation, over 6800 loci were identified and assessed in two in vitro grown potato varieties, the strongly-responsive Red Pontiac and the poorly-responsive Superior. Compared to non-bacterized control, bacterized Red Pontiac exhibited little change in the overall cytosine methylation, although methylation polymorphisms did occur. In contrast, poorly-responsive Superior exhibited significantly higher levels of overall cytosine methylation and a decrease in the number of non-methylated sites in the bacterized plants compared to controls. Superior had significantly higher DNA methylation and DNA hyper-methylation than Red Pontiac, suggesting that enhanced DNA loci methylation is involved in the suppression of PsJN-induced plant growth stimulation. Several DNA fragments, corresponding to different open reading frames exhibiting methylation polymorphisms in Red Pontiac or Superior were sequenced. Gene expression analysis of a subset of those genes was carried out using real time PCR. We identified several genes whose transcript levels were either enhanced or decreased in response to PsJN in a variety-specific way, as well as genes that were specifically enhanced in both varieties in response to the endophyte. (C) 2011 Elsevier Masson SAS. All rights reserved.
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