Journal
PLANT CELL AND ENVIRONMENT
Volume 34, Issue 7, Pages 1191-1206Publisher
WILEY
DOI: 10.1111/j.1365-3040.2011.02317.x
Keywords
basal resistance; genetic variation; herbivores; hormones; pathogens; priming of defence
Categories
Funding
- BBSRC (UK) [BB/E023959/1]
- Netherlands Organization of Scientific Research (NWO) [865.04.002, 863.04.019]
- Biotechnology and Biological Sciences Research Council [BB/E023959/1] Funding Source: researchfish
- BBSRC [BB/E023959/1] Funding Source: UKRI
Ask authors/readers for more resources
Basal resistance involves a multitude of pathogen- and herbivore-inducible defence mechanisms, ranging from localized callose deposition to systemic defence gene induction by salicylic acid (SA) and jasmonic acid (JA). In this study, we have explored and dissected genetic variation in the responsiveness of basal defence mechanisms within a selection of Arabidopsis accessions. Responsiveness of JA-induced PDF1.2 gene expression was associated with enhanced basal resistance against the necrotrophic fungus Plectosphaerella cucumerina and the herbivore Spodoptera littoralis. Conversely, accessions showing augmented PR-1 induction upon SA treatment were more resistant to the hemi-biotrophic pathogen Pseudomonas syringae, and constitutively expressed defence-related transcription factor (TF) genes. Unexpectedly, accessions with primed responsiveness to SA deposited comparatively little callose after treatment with microbe-associated molecular patterns. A quantitative trait locus (QTL) analysis identified two loci regulating flagellin-induced callose and one locus regulating SA-induced PR-1 expression. The latter QTL was found to contribute to basal resistance against P. syringae. None of the defence regulatory QTLs influenced plant growth, suggesting that the constitutive defence priming conferred by these loci is not associated with major costs on plant growth. Our study demonstrates that natural variation in basal resistance can be exploited to identify genetic loci that prime the plant's basal defence arsenal.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available