Acid rain is the greatest ecological environmental disasters in the world, as well as global warming and ozone depletion. Due to the special energy structure and unique geography location, the southwest regions of China had become one of the four greatest acid rain zones. Canna indica is a commonly use plant for park landscaping, which can absorb harmful gas, decontaminate water and cumulate heavy metals reported before. However, the damage and resistance mechanism of Canna indica by the acid rain is not we...