pH induced elastic modulus of guard cell wall in stomatal movement  

作　　者：YANG Yi ZHAO Yang ZHU GuoLi 

机构地区：[1]Environment and Plant Protection Institute,Chinese Academy of Tropical Agricultural Sciences,Key Laboratory of Monitoring and Control of Tropical Agricultural and Forest Invasive Alien Pests,Ministry of Agriculture,Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests,Danzhou 571737,China [2]State Key Laboratory of Plant Physiology and Biochemistry,College of Biological Sciences,China Agricultural University,Beijing 100193,China

出　　处：《Chinese Science Bulletin》2011年第33期3554-3557,共4页

基　　金：supported by the National Natural Science Foundation of China (39870075 and 39600090)

摘　　要：Guard cell wall properties are important in stomatal movement. Previous research focused on the structure and anatomy of guard cell walls, but little is known about the physical changes that take place within the walls during stomatal opening and closure. In this work, we investigate the volumetric elastic modulus (ε) of the guard cell wall at different pH values during stomatal opening in Vicia faba epidermal strips using a cell pressure probe. The volumetric elastic modulus of the guard cell wall decreased from 7.098 to 5.690 MPa when the pH of the cell wall decreased from 8.60 to 6.50. It is easier for guard cells to change their volume at a lower volumetric elastic modulus during stomatal movement. The results are suggestive of a putative role for pH in the regulation of stomatal movement.Guard cell wall properties are important in stomatal movement. Previous research focused on the structure and anatomy of guard cell walls, but little is known about the physical changes that take place within the walls during stomatal opening and closure. In this work, we investigate the volumetric elastic modulus (e) of the guard cell wall at different pH values during stomatal opening in Viciafaba epidermal strips using a cell pressure probe. The volumetric elastic modulus of the guard cell wall decreased from 7.098 to 5.690 MPa when the pH of the cell wall decreased from 8.60 to 6.50. It is easier for guard cells to change their volume at a lower volumetric elastic modulus during stomatal movement. The results are suggestive of a putative role for pH in the regula- tion of stomatal movement.

关 键 词：体积弹性模量 气孔运动 细胞壁 pH值 诱导 气孔开放 压力传感器 物理变化 

分 类 号：Q945[生物学—植物学]