T1N6_22 gene is required for biotic and abiotic stress responses in Arabidopsis

Botrytis cinerea causes severe disease in a wide range of plant species and is difficult to be controlled, resulting in significant economic losses. In this study, T1N6_22, a NAD(P)-binding domain-containing protein in Arabidopsis thaliana, was found to be a positive regulator of the basal defense response, and its loss-of-function mutation resulted in enhanced susceptibility to infection by B. cinerea. In the case of Alternaria brassicae, the t1n6_22 plants exhibited enhanced disease symptoms, suggesting the T1N6_22 was a common host response strategy against these pathogens. Further analyses of 35S: T1N6_22 Arabidopsis plants had shown that complemented transgenic plants were also indistinguishable from wild-type plants in their response to B. cinerea inoculation. To gain insight into the role of the T1N6_22 in the plant defense signaling pathway, we detected the expression of the T1N6_22 in different signaling pathway mutants. Strikingly, t1n6_22 plants had impaired tolerance to salt stress, but drought stress was similar in t1n6_22 and wild-type (WT) plants. These results indicate that T1N6_22 might be involved in tolerance mechanisms to both biotic and abiotic stress response.