The Carbonic Anhydrase βCA1 Functions in PopW-Mediated Plant Defense Responses in Tomato.

β-Carbonic anhydrase (βCA) is very important for plant growth and development, but its function in immunity has also been examined. In this study, we found that the expression level of () was significantly upregulated in plants treated with 85-10. The protein was localized in the nucleus, cell membrane and chloroplast. Using tomato plants silenced with , we demonstrated that SlβCA1 plays an active role in plant disease resistance. Moreover, we found that the elicitor PopW upregulated the expression of , while the microbe-associated molecular pattern response induced by PopW was inhibited in TRV-. The interaction between PopW and SlβCA1 was confirmed. Here, we found that SlβCA1 was positively regulated during PopW-induced resistance to 85-10. These data indicate the importance of SlβCA1 in plant basic immunity and its recognition by the Harpin protein PopW as a new target for elicitor recognition.