【摘要】 重金属污染物进入海洋环境会破坏海洋生态系统的结构和功能。海洋微藻构成了海洋食物链的基础,是海洋生态系统主要的初级生产者。重金属复合胁迫对海洋微藻产生毒性效应,会阻碍藻细胞分裂、破坏DNA结构、抑制光合作用、减少细胞色素合成、导致藻细胞畸变以及改变浮游植物种类组成等。海洋微藻在长期种系进化或个体发育过程中,形成了一系列响应重金属复合胁迫的特殊生理生态机制。它们可以利用由酶类和非酶类组成的抗逆保护系统,减轻重金属复合胁迫导致的生物毒害作用;还可以通过调节金属硫蛋白(Metallothionein,MT)等相关蛋白基因表达以维持正常的生理功能。探究海洋微藻响应重金属复合胁迫的生理生态学机制,有利于为海洋重金属污染的生物修复提供依据,具有重要的理论与现实意义。更多还原

【Abstract】 heavy metals may enter the marine environment, and hence destroy the structure and function of marine ecosystem. Marine microalgae are the primary producers of marine ecosystem and constitute the basis of food chain in sea. The heavy metals are harmful to marine microalgae, which may hinder the algal cell division, destroy the DNA structure, inhibit the photosynthesis, reduce the cytochrome synthesis, cause cell distortion and even change phytoplankton species composition. During the long-term evolution or individual development of marine microalgae, a series of physiological and ecological mechanisms in response to heavy metal complex stress have been formed. They can start the protective system composed of enzymes and non enzymes to alleviate the toxic effect of heavy metals; they may also regulate the expression of metallothionein and other related protein genes in order to maintain the normal physiological function. Exploring the physiological and ecological mechanism of marine microalgae in response to heavy metal complex stress is beneficial to the bioremediation of marine heavy metal pollution, which is of both theoretical and practical significance.更多还原