Virus infection induces resistance to and to drought in both compatible and incompatible bacteria–host interactions, which are compromised under conditions of elevated temperature and CO levels Free

Abstract

Plants are simultaneously exposed to a variety of biotic and abiotic stresses, such as infections by viruses and bacteria, or drought. This study aimed to improve our understanding of interactions between viral and bacterial pathogens and the environment in the incompatible host and the susceptible host , and the contribution of viral virulence proteins to these responses. Infection by the (PVX)/ (PPV) pathosystem induced resistance to (Pst) and to drought in both compatible and incompatible bacteria–host interactions, once a threshold level of defence responses was triggered by the virulence proteins P25 of PVX and the helper component proteinase of PPV. Virus-induced resistance to Pst was compromised in salicylic acid and jasmonic acid signalling-deficient but not in lines. Elevated temperature and CO levels, parameters associated with climate change, negatively affected resistance to Pst and to drought induced by virus infection, and this correlated with diminished HO production, decreased expression of defence genes and a drop in virus titres. Thus, diminished virulence should be considered as a potential factor limiting the outcome of beneficial trade-offs in the response of virus-infected plants to drought or bacterial pathogens under a climate change scenario.

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2020-01-01
2024-03-28
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