[Inhibition effects of salt stress on photosynthetic activity of Rumex K-1].
With Rumex K-1 seedlings as test materials, this paper studied the effects of different concentration (100-300 mmol x L(-1)) NaCl and KCl on their leaf photosynthetic activity and osmotic adjustment. The results showed that at the concentration of 200 mmol x L(-1), NaCl had greater inhibition effect on the leaf photosynthetic activity than KCl, but at 300 mmol x L(-1), the inhibition effect of KCl was much greater than NaCl. After treated with 300 mmol x 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 x L(-1) of KCl was not from osmotic stress. Under the stress of 300 mmol KCl x L(-1), the leaf Na+ concentration decreased by 88.6%, compared with the control, while the supplement of 25 mmol NaCl x 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 x L(-1) of KCl.
Fang
Peng
P
State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, Tai'an 271018, Shandong, China. happyfangpeng@163.com
Ren
Li-Li
LL
Zhang
Li-Tao
LT
Gao
Hui-Yuan
HY
D010788:Photosynthesis / Q000187:drug effects / Q000502:physiology*; D018515:Plant Leaves / Q000502:physiology; D011189:Potassium Chloride / Q000494:pharmacology*; D031804:Rumex / Q000235:genetics / Q000502:physiology*; D036226:Seedlings / Q000502:physiology; D012965:Sodium Chloride / Q000494:pharmacology*; D012987:Soil / Q000032:analysis*; D013312:Stress, Physiological
D012987:Soil; D012965:Sodium Chloride; D011189:Potassium Chloride