Natural variation of potato allene oxide synthase 2 causes differential levels of jasmonates and pathogen resistance in Arabidopsis.

Planta
Karolina Pajerowska-MukhtarChristiane Gebhardt

Abstract

Natural variation of plant pathogen resistance is often quantitative. This type of resistance can be genetically dissected in quantitative resistance loci (QRL). To unravel the molecular basis of QRL in potato (Solanum tuberosum), we employed the model plant Arabidopsis thaliana for functional analysis of natural variants of potato allene oxide synthase 2 (StAOS2). StAOS2 is a candidate gene for QRL on potato chromosome XI against the oömycete Phytophthora infestans causing late blight, and the bacterium Erwinia carotovora ssp. atroseptica causing stem black leg and tuber soft rot, both devastating diseases in potato cultivation. StAOS2 encodes a cytochrome P450 enzyme that is essential for biosynthesis of the defense signaling molecule jasmonic acid. Allele non-specific dsRNAi-mediated silencing of StAOS2 in potato drastically reduced jasmonic acid production and compromised quantitative late blight resistance. Five natural StAOS2 alleles were expressed in the null Arabidopsis aos mutant under control of the Arabidopsis AOS promoter and tested for differential complementation phenotypes. The aos mutant phenotypes evaluated were lack of jasmonates, male sterility and susceptibility to Erwinia carotovora ssp. carotovora. StAOS2 ...Continue Reading

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Citations

Jun 18, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Sarah DananVéronique Lefebvre
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Jul 8, 2020·International Journal of Molecular Sciences·Jiang XiongXiaopeng Lu
Jan 12, 2020·Communications Biology·Xiaoyu LiuKarolina M Pajerowska-Mukhtar

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Methods Mentioned

BETA
dissection
PCR
transgenic
confocal microscopy

Software Mentioned

ImageQuant
PdbViewer
GelDoc
Blast
nFOLD2
Swiss

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