Key message Host perception of Phytophthora nicotianae switching to necrotrophy is fundamental for disease toler- ance of citrus. It involves an HR-like response, strengthening of the cell wall structure and hormonal signaling. Abstract Stem rot caused by P. nicotianae is a worldwide disease of several important crops, including citrus. Given the growing awareness of chemical fungicides drawbacks, genetic improvement of citrus rootstocks remains the best alterna- tive. However, the molecular basis underlying the successful response of resistant and/or tolerant genotypes remains poorly understood. Therefore, we performed a transcriptomic analysis to examine the differential defense response to P. nicotianae of two germplasms—tolerant sour orange (SO, Citrus aurantium) and susceptible Madam Vinous (MV, C. sinensis)—in both the biotrophic and necrotrophic phases of host–pathogen interaction. Our results revealed the necrotrophic phase as a decisive turning point, since it included stronger modulation of a number of genes implicated in pathogen perception, signal transduction, HR-like response, transcriptional reprogramming, hormone signaling, and cell wall modifications. In particular, the pathogen perception category reflected the ability of SO to perceive the pathogen even after its switch to necrotrophy, and thus to cope successfully with the infection, while MV failed. The concomitant changes in genes involved in the
Plant Cell Reports – Springer Journals
Published: Dec 30, 2017
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