a Department of Biological Sciences and Technology , National University of Tainan , Tainan , Taiwan.
b Institute of Plant Biology and Department of Life Science , National Taiwan University , Taipei , Taiwan.
Plant Signal Behav. 2017 Jun 3;12(6):e1338227. doi: 10.1080/15592324.2017.1338227. Epub 2017 Jun 15.
Pectin is an important cell wall polysaccharide required for cellular adhesion, extension, and plant growth. The pectic methylesterification status of guard cell walls influences the movement of stomata in response to different stimuli. Pectin methylesterase (PME) has a profound effect on cell wall modification, especially on the degree of pectic methylesterification during heat response. The Arabidopsis thaliana PME34 gene is highly expressed in guard cells and in response to the phytohormone abscisic acid. The genetic data highlighted the significant role of PME34 in heat tolerance through the regulation of stomatal movement. Thus, the opening and closure of stomata is mediated by changes in response to a given stimulus, could require a specific cell wall modifying enzyme to function properly.
果胶是一种重要的细胞壁多糖，对于细胞的黏附、延伸和植物生长是必需的。保卫细胞壁的果胶甲酯化状态影响气孔对不同刺激的运动。果胶甲酯酶（PME）对细胞壁的修饰有深远的影响，尤其是在热响应过程中果胶甲酯化的程度。拟南芥 PME34 基因在保卫细胞中高度表达，并对植物激素脱落酸有反应。遗传数据通过调节气孔运动，突出了 PME34 在耐热性中的重要作用。因此，气孔的开启和关闭是通过对特定刺激的反应变化来介导的，这可能需要特定的细胞壁修饰酶才能正常发挥作用。
