| Effect of NaCl stress on osmotic adjustment of Peganum L．seedlings |
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| DOI：10.7606/j.issn.1000-7601.2006.05.25 |
| Key Words: Peganum L. NaCl stress inorganic ions organic solutes osmotic adjustment |
| Author Name | Affiliation | | LIU Jian-xin | Department of Life Science Longdong University,Qingyang,Gansu 745000,China | | ZHAO Guo-lin | Department of Life Science Longdong University,Qingyang,Gansu 745000,China | | HU Hao-bin | Department of Chemistry Longdong University,Qingyang, Gansu 745000,China | | LIU Li-pin | Department of Life Science Longdong University,Qingyang,Gansu 745000,China |
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| Abstract: |
| Three species of Peganum seedlings were treated with different concentrations of NaCl.The content of main inorganic ions and organic solutes,the osmotic potential and the osmotic adjustment ability of roots and leaves were determined in 28 days after being treated.The results showed that dry weight of shoot and root of P.harmala L.,P.nigellastrum Bge and P.multisectum Bobr were markedly increased under the treatment of 200,100,100 mmol/L NaCl concentration,respectively,whereas over those concentration of NaCl,the biomass displayed an apparent reduction.With the increase of NaCl concentration,the content of Na+ and Cl-in leaves and roots of these three species of Peganum were obviously increased,the content of NO-3and the ratio of K+/Na+ were decreased,the selectivity of K+ over Na+((S)K,Na) were increased except for that in leaves of P.multisectum Bobr which was decreased,and the content of Ca2+ and Mg2+ were either increased or decreased under different NaCl concentration.The content of inorganic ions accounted for 68.37%～83.82% of the calculated osmotic potential(COP),and tended to decrease with the increase of NaCl concentration.With NaCl concentration increasing,the content of soluble sugar and amino acid was clearly increased,whereas the content of organic acids and proline showed little change.The total content of organic solutes accounted for(16.18)%～31.63% of COP,and showed a remarkable increase with the increase of NaCl concentration.The(ability) of osmotic adjustment of Peganum was increased with NaCl concentration increasing,and it was higher in leaves than that in roots.The ability of osmotic adjustment presented a tendency of P.harmala L.>P.nigellastrum Bge>P.multisectum Bobr,indicating that P.harmala L.had a strong adaptability to salt(environment.) |
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