盐胁迫对杂交酸模叶片光合活性的抑制作用  

Inhibition effects of salt stress on photosynthetic activity of Rumex K-1.

作　　者：房朋[1] 任丽丽[2] 张立涛[1] 高辉远[1] 

机构地区：[1]山东农业大学生命科学学院作物生物学国家重点实验室 [2]滨州学院生命科学系,山东滨州256603

出　　处：《应用生态学报》2008年第10期2137-2142,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30571125);高等学校博士点专项基金项目(20050434007);滨州学院青年人才创新工程科研基金资助项目(BZXYQNLG200719)

摘　　要：以杂交酸模（Rumex K-1）为试材,研究了不同浓度（100～300 mmol·L^-1） KCl和NaCl胁迫对杂交酸模幼苗叶片光合活性及渗透调节的影响.结果表明：200 mmol·L^-1浓度的NaCl对杂交酸模幼苗叶片光合活性的抑制作用大于KCl；当浓度增大到300 mmol·L^-1时，KCl对杂交酸模叶片光合活性的抑制作用显著大于NaCl.300 mmol·L^-1 KCl和NaCl处理植株的叶片水势分别为-0.93 MPa和-1.05 MPa，渗透势分别为-1.43 MPa和-1.10 MPa,说明KCl对杂交酸模植株过多的伤害不是渗透胁迫造成的；经过300 mmol·L^-1KCl胁迫后，杂交酸模叶片中Na＋含量急剧降到对照植株的11.4％，而补充25 mmol·L^-1 NaCl可以明显缓解KCl对杂交酸模光合活性的伤害，说明Na^＋的亏缺和高浓度K^＋的积聚可能是导致高浓度KCl对杂交酸模光合活性的伤害比NaCl更严重的主要原因.With Rumex K-1 seedlings as test materials, this paper studied the effects of different concentration （ 100-300 mmol ·L^-1） NaCl and KCl on their leaf photosynthetic activity and osmotic adjustment. The results showed that at the concentration of 200 mmol ·L^-1, NaCl had greater inhibition effect on the leaf photosynthetic activity than KCl, but at 300 mmol ·L^-1, the inhibition effect of KCl was much greater than NaCl. After treated with 300 mmol ·L^-1 of KCl and NaCl, the leaf water potential was -0. 93 MPa and - 1.05 MPa, and the osmotic potential was - 1.43 MPa and - 1.10 MPa, respectively, indicating that the increased damage caused by 300 mmol ·L^-1 of KCl was not from osmotic stress. Under the stress of 300 mmol KCl ·L^-1, the leaf Na ^＋ concentration decreased by 88.6% , compared with the control, while the supplement of 25 mmol NaCl·L^-1 could obviously alleviate the damage of KCl on leaf photosynthesis, which proved that the deficit of Na ^＋ and the accumulation of K ^＋ in Rumex K-1 leaves could be responsible to the enhanced damage caused by 300 mmol·L^-1 of KCl.

关 键 词：杂交酸模 NACL KCL 光合活性 渗透调节 

分 类 号：Q945[生物学—植物学]