类萌发素蛋白在植物防卫反应中的作用

The Role of Germin-Like Protein in Plant Defense Responses

植物在生长过程中受到各种生物及非生物胁迫,在长期的适应过程中植物进化出多种抵御这些胁迫的策略,如病程相关蛋白(PRs)的激活等。类萌发素蛋白(GLPs)是PRs家族中的一类胞外糖蛋白,在植物中普遍存在。GLPs主要以酶、受体和结构蛋白的形式参与多种生理生化过程,能清除植物体内过多的活性氧(ROS),GLPs催化反应所产生的H2O2可通过选择性地参与信号级联途径来诱导植物的防卫反应,H2O2还可以通过纤维素交联作用增强细胞壁的结构,在植物抵抗氧化胁迫过程中起重要作用。本文综述了植物GLPs的结构特征及其参与的植物对逆境胁迫的防卫反应。

During growth and development, plants often suffer from a great diversity of stresses. Plants have evolved a variety of strategies to cope with these stresses during the long-time adaptation to adverse environ- ment, such as the activation ofpathogenesis-related proteins （PRs）. The germin-like proteins （GLPs） are a class of extracellular glycoproteins encoded by the members of PR genes. The GLPs are involved in a variety of plant physiological and biochemical processes, and they mainly function in the form of enzymes, receptors, and structural proteins, thus excessive reactive oxygen species （ROS） could be scavenged. At the same time, the H202 generating in catalytic reaction of GLPs selectively participates in signaling cascades to induce plant de- fense responses, and H202 also functions in buildup of cell wall intensity through crosslinking of cellulose, which plays an important role in resistance to oxidative stress. The structural features and the functions of GLPs related with defense responses under adversity stresses are summarized in this paper.