Exogenous Melatonin Enhances Cold Resistance by Improving Antioxidant Defense and Cold-Responsive Genes’ Expression in Banana

Accumulated evidence has revealed the mitigation effects of exogenous melatonin on cold stress in plants. In this study, to investigate defensive roles banana under stress, we researched influences chlorophyll fluorescence parameters, antioxidant defense indexes and expression levels cold-responsive genes cold-stressed ‘Brazil’ seedlings. Results showed that 100 ?M achieved best cold-resistance-promoting effect banana. Exogenous treatment significantly increased electron transfer rate, light harvesting efficiency, total capacity, catalase superoxidase activities proline soluble sugar contents reduced accumulations malondialdehyde, superoxide anion hydrogen peroxide leaves addition, induced low-temperature-responsive genes, such as MaChiI1, MaCSD1C, MaWhy1, MaKIN10, MaADA1 MaHOS1. It was concluded application enhanced thereby improving resistance Our study will provide a basis for plant resistance.