Physiological And Biochemical Characteristics Effects Of Four Aquatic Plants Under Cu²⁺ Stress

Copper is one of indispensable trace elements in plant, but it also be a heavy-metal element that can lead to severe environment pollution. Its pollutions are usually hard to eliminate and bringing various grievous environment and health problems. Recently, copper pollution caused wide attention as the development of modern industry and agriculture mod ernization. Acorus calamus, Myriophyllum spicatum, Hydrocotyle vulgaris and Iris pseudacorus L are four common aquatic plants. They were easy to be cultivated and extensively managed, not only beautify the circumstance, but also bring economical benefits. Therefore, they were regarded as very valuable materials for water greening. However, there is little report about their toxic effort and absorptive capability research at present. This research have systematic investigated the physiological and biochemical characteristics of these four aquatic plants under copper stress, revealed their copper stress tolerance mechanism, and established a copper stress tolerance evaluation index system in order to provide a theoretical basis for breeding copper stress tolerance aquatic plants.The main conclusions of this experiment are as follows:1. Different concentrations of copper stress to four aquatic plants lead to different effects. Integrating the dose and periods of copper exposure on these plants, preliminary judged that plant injurious in the 21-day Cu2+ exposure experiments were: Acorus calamus (14+18+22+24+28=106)Acorus calamus> Myriophyllum spicatum>Iris pseudacorus L, which is different with the results just by the morphological observation to Hydrocotyle vulgaris. Iris pseudacorus L was regarded as the most copper sensitive plant, because the whole plant was dead in the 21th day.