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科学通报  2011 

气孔运动中pH对保卫细胞壁弹性模量的影响

, PP. 2523-2526

Keywords: 弹性模量,保卫细胞壁,细胞压力探针,pH,气孔运动

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Abstract:

保卫细胞壁的特性对气孔运动有重要的影响.以前的研究多集中于保卫细胞壁的解剖结构,对气孔运动中保卫细胞壁物理性质的改变了解很少.本研究以蚕豆叶片表皮条为材料,运用细胞压力探针技术,对气孔运动中不同pH下的保卫细胞壁弹性模量(ε)进行了测量.研究发现,当pH从8.60降至6.50时,保卫细胞壁的弹性模量从7.098Pa降至5.690Pa.气孔运动中,较低的保卫细胞壁弹性模量有利于保卫细胞改变体积,进而有助于气孔运动的完成.从保卫细胞通过调控细胞壁pH改变细胞壁弹性模量的角度来分析气孔运动机理,对于完善气孔运动机理假说,进而深刻理解气孔运动,具有重要的意义.

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