The hard-end is a disorder of pear fruit, however, the mechanisms underlying its development remain unknown. In this study, we found that the hard-end fruit contained a higher transcript abundance level of ethylene-response factor 1b-like (PpERF1b-like) and released more ethylene compared to normal pear. In the ethephon treated normal fruit, flesh tissues accumulated more lignin together with elevated expression of PpERF1b-like. Overexpressing PpERF1b-like transiently in fruit and stably in callus increased lignin accumulation and the expression of lignin biosynthesis genes; the opposite results were observed in fruit showing repressed expression of PpERF1b-like. These results confirmed the role of PpERF1b-like in promoting hard-end formation through promoting lignin synthesis. This study provided valuable information for further clarifying the regulation of hard-end formation in pear.
Keywords: PpERF1b-like; ethephon; hard-end; lignin; pear.
Copyright © 2022 Jin, Cheng, Qi, Zhou, Wang, Zhang, Sun, Wang, Dang and Yang.