Chrysanthemum CmHSP90.5 as a Tool to Regulate Heat and Salt Stress Tolerance

Heat shock proteins (HSPs) play important roles in various stress conditions. In this study, CmHSP90.5, whose expression is induced by heat and salt, was cloned from a chrysanthemum (Chrysanthemum morifolium) ‘Jinba’ expressed Arabidopsis. We found that CmHSP90.5 localized the chloroplast. The heterologous of weakened tolerance Arabidopsis reduced activity antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), indicating CmHSP90.5-mediated sensitivity may be partially due to regulation active oxygen cleavage. levels AtHSP101, AtHSP15.7, AtHSP17.6C CmHSP90.5-overexpressing plants decreased compared with those wild-type (WT) under stress, these HSPs coregulate plant’s tolerance. addition, salt WT plants; showed increased Na+ K+ proline plants. Interestingly, stress-related genes, such as Na+/H+ antiporter encoding gene SOS1, high-affinity transporter HKT1;1, synthesis AtP5CS1, expressions Our findings lay foundation for understanding response abiotic stresses chrysanthemum.