Unravelling the Interplay of Nitrogen Nutrition and the Botrytis cinerea pectin lyase BcPNL1 in Modulating Arabidopsis thaliana Susceptibility
Daviere, A.; Voxeur, A.; Jolivet, S.; Vernhettes, S.; Soulie, M.-C.; Fagard, M.
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In this study, we investigated the intricate interplay between nitrogen nutrition, and the dynamics of pectin degradation during plant-pathogen interactions, using Arabidopsis thaliana and Botrytis cinerea as a model pathosystem. Our findings revealed a noteworthy impact of nitrogen availability on the pectin degrading activity of the B. cinerea pectin lyase 1 (PNL) for which the mutant strains presented a reduced pathogenicity restored by complementation. More precisely, infected nitrogen-sufficient (high N) plants exhibited an increased release of PNL-derived oligogalacturonides compared to infected nitrogen-deficient (low N) plants. This correlated with an elevated expression of jasmonic acid repressor genes in high N plants, rendering them more susceptible to B. cinerea. Using{Delta} Bcpnl1 deletion mutants, we demonstrated that the increased production of BcPNL1 -derived oligogalacturonides under high N conditions was responsible for the increased expression of jasmonic acid repressor genes, significantly contributing to the higher susceptibility of high N plantsto B. cinerea. In conclusion, we demonstrated that BcPNL1 is a major pathogenicity factor during B. cinerea interaction that is affected by the plants N nutrition conditions.
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