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The phytohormone auxin is essential for plant growth and development, and YUCCA (YUC) proteins catalyze a rate-limiting step for endogenous auxin biosynthesis. Despite  YUC  family genes have been isolated from several species, systematic expression analyses of  YUCs  in response to abiotic stress are lacking, and little is known about the function of YUC homologs in agricultural crops. Cucumber ( Cucumis sativus  L.) is a world cultivated vegetable crop with great economical and nutritional value. In this study, we isolated 10  YUC  family genes ( CsYUCs)  from cucumber and explored their expression pattern under four types of stress treatments. Our data showed that  CsYUC8  and  CsYUC9  were specifically upregulated to elevate the auxin level under high temperature.  CsYUC10b  was dramatically increased but  CsYUC4  was repressed in response to low temperature.  CsYUC10a  and  CsYUC11  act against the upregulation of  CsYUC10b  under salinity stress, suggesting that distinct YUC members participate in different stress response, and may even antagonize each other to maintain the proper auxin levels in cucumber. Further,  CsYUC11  was specifically expressed in the male flower in cucumber, and enhanced tolerance to salinity stress and regulated pedicel and stamen development through auxin biosynthesis in  Arabidopsis .

Different cucumber CsYUC genes regulate response to abiotic stresses and flower development