对植物血红蛋白功能的新发现——调节NO的生物活性

The New Discovery of Plant Haemoglobins' Function——Modulation of Nitric Oxide Bioactivity

血红蛋白在植物中广泛存在,对其功能的研究也不断深入。最新研究发现植物血红蛋白除具有运载氧、感应氧等生理功能外,还对植物诸多代谢活动发挥重要的调控作用,而这一作用主要通过调节信号分子NO的生物活性来实现。综述了在正常生长及胁迫条件下,植物血红蛋白对NO生物活性的调节作用,着重阐述缺氧条件下植物血红蛋白在解除NO毒害,再生NAD(P)+及维持能量水平等方面的功能及其机制。植物血红蛋白功能的这一新发现对研究不同条件下NO信号转导途径的调节机制具重要意义。

Haemoglobins exist widely in the plant kingdom, whose functions have been studied thoroughly. Recently, evidences have accumulated to indicate that besides the physiological functions in carrying O2 and sensoring O2, a new role of plant haenoglobins can carry out by modulating the bioactivity of nitric oxide. This review discusses the function of plant haemoglobins in relation to regulate the nitric oxide level under plant growth and stress, emphasizes the functions and mechanisms of plant haemoglobins involve in NO detoxification, regeneration of NAD（P）^＋, maintenance of energy status. This discovery of plant haemoglobins＇ new role provides important meaning to research the regulation mechanism of NO signal transduction.