Cloning and Expression Analysis of the Rice Ubiquitin Ligase Gene OsRING6 Abiotic Stress-related RING Finger Proteins in Plant Prokaryotic Expression,Purification and in Vitro Ubiquitination Assay of BoARC1 from Ornamental Kale E3 Ubiquitin Ligase-mediated Drought Responses in Plants Cullin-RING Ubiquitin Ligase Family in Plant Abiotic Stress Pathways Prokaryotic Expression,Purification and in Vitro Ubiquitination Assay of BoARC1 from Ornamental Kale