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Background  Wall-associated kinase (WAK)/WAK-like (WAKL) is one of the subfamily of receptor like kinases (RLK). Although previous studies reported that WAK/WAKL played an important role in plant cell elongation, response to biotic and abiotic stresses, there are no systematic studies on RcWAK/RcWAKL in rose.    Results  In this study, we identified a total of 68 RcWAK/RcWAKL gene family members within rose ( Rosa chinensis ) genome. The RcWAKs contained the extracellular galacturonan-binding domain and calcium-binding epidermal growth factor (EGF)-like domain, as well as an intracellular kinase domains. The RcWAKLs are missing either calcium-binding EGF-like domain or the galacturonan-binding domain in their extracellular region. The phylogenetic analysis showed the RcWAK/RcWAKL gene family has been divided into five groups, and these  RcWAK/RcWAKL  genes were unevenly distributed on the 7 chromosomes of rose. 12 of  RcWAK/RcWAKL  genes were significantly up-regulated by  Botrytis cinerea -inoculated rose petals, where  RcWAK4  was the most strongly expressed. Virus induced gene silencing of  RcWAK4  increased the rose petal sensitivity to  B. cinerea.  The results indicated  RcWAK4  is involved in the resistance of rose petal against  B. cinerea .    Conclusion  Our study provides useful information to further investigate the function of the RcWAK/RcWAKL gene family and breeding research for resistance to  B. cinerea  in rose.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12870-021-03307-9.

bmc plant biology

Characterization of wall-associated kinase/wall-associated kinase-like (WAK/WAKL) family in rose (Rosa chinensis) reveals the role of RcWAK4 in Botrytis resistance