Fig. 2

Representative phenotypes of NaCl stress mitigation by exogenous melatonin in Heihu seedlings after 10 days of salt stress treatment. Note: (1) CK: common bean plants cultivated with only Hoagland nutrient solution; (2) NaCl: Hoagland nutrient solution plus 150 mmol·L^− 1 NaCl; (3) NaCl + Mt: Hoagland nutrient solution plus 150 mmol·L^− 1 NaCl and 100 mmol·L^− 1 melatonin