Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8309
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Funding
- National Basic Research Program of China (973 Program) [2012CB910900, 2012CB114006]
- National Natural Science Foundation [31330048]
- Ministry of Agriculture of China (948 Program) [2011-G2B]
- Agriculture and Food Research Initiative competitive grant of the USDA National Institute of Food and Agriculture [2011-67013-30125]
- Peking-Tsinghua Center for Life Sciences
- National Institutes of Health [2R01-GM069594-09]
- Howard Hughes Medical Institute
- Gordon and Betty Moore Foundation [GBMF3032]
- NIFA [579682, 2011-67013-30125] Funding Source: Federal RePORTER
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [929226] Funding Source: National Science Foundation
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Heterosis, the phenotypic superiority of a hybrid over its parents, has been demonstrated for many traits in Arabidopsis thaliana, but its effect on defence remains largely unexplored. Here, we show that hybrids between some A. thaliana accessions show increased resistance to the biotrophic bacterial pathogen Pseudomonas syringae pv. tomato (Pst) DC3000. Comparisons of transcriptomes between these hybrids and their parents after inoculation reveal that several key salicylic acid (SA) biosynthesis genes are significantly upregulated in hybrids. Moreover, SA levels are higher in hybrids than in either parent. Increased resistance to Pst DC3000 is significantly compromised in hybrids of pad4 mutants in which the SA biosynthesis pathway is blocked. Finally, increased histone H3 acetylation of key SA biosynthesis genes correlates with their upregulation in infected hybrids. Our data demonstrate that enhanced activation of SA biosynthesis in A. thaliana hybrids may contribute to their increased resistance to a biotrophic bacterial pathogen.
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