NaCl胁迫对流苏幼苗生长、钠钾离子分布及渗透调节物质的影响
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引用本文:韩丽霞,欧阳敦君,张鸽香.NaCl胁迫对流苏幼苗生长、钠钾离子分布及渗透调节物质的影响[J].西北植物学报,2020,40(3):502~509
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作者单位
韩丽霞1,欧阳敦君2,张鸽香1* (南京林业大学 风景园林学院南京 210037) 
基金项目:国家林业局“948”项目(2014 4 17);
中文摘要:以2年生的流苏播种苗为材料,采用不同浓度(50、100、200、300 mmol·L-1)NaCl溶液进行胁迫处理,研究盐胁迫对流苏的生长、Na+和K+分布格局、渗透调节物质的影响,以明确其耐盐阈值。结果表明:(1)随着NaCl胁迫浓度的增加,流苏幼苗生长量逐渐降低,盐害指数升高、存活率下降;幼苗耐盐阈值为98.693 mmol·L-1(0.577% W/V)。(2)随着NaCl胁迫浓度的增加,流苏幼苗各器官中的Na+含量持续增加,并在浓度为50 mmol·L-1时表现为根>叶>茎,在其余各处理组表现为叶>根>茎;幼苗根、叶中的K+含量表现为先增后减的变化趋势,茎中K+含量总体表现为下降趋势,且器官中K+含量表现为根>叶>茎;幼苗根部到茎部和茎部到叶部的离子选择性运输能力、各器官中的K+/Na+比值均呈下降趋势。(3)随着NaCl浓度的增加,流苏幼苗叶片可溶性糖、可溶性蛋白含量总体呈上升趋势,其脯氨酸含量呈先上升后下降的趋势。研究发现,流苏幼苗根系可通过对Na+的吸收和累积来阻止其向地上部运输进而避免盐害发生;叶片和茎中通过提高对K+的选择性吸收和累积,从而增大K+/Na+比值以减缓盐分对其生理代谢的伤害。
中文关键词:流苏  NaCl胁迫  生长  钠钾离子分布  渗透调节
 
Growth, Na+ and K+ Distribution and Osmotic Regulation of Chionanthus retusus Seedlings under NaCl Stress
Abstract:In order to exploit the salt tolerance ability of Chionanthus retusus, we studied the plant growth, distribution patterns of Na+ and K+ and relative conductivity and osmotic adjustment substances of C. retusus under different concentrations (50, 100, 200, 300 mmol·L-1) of NaCl solution with potted two year seedlings. The results show that: (1) with the increase of NaCl concentration, the seedling growth of C. retusus decreased gradually; the salt damage index increased and the survival rate decreased. Salt tolerance threshold of seedling was 98.693 mmol·L-1 (0.577% W/V). (2) The content of Na+ in every organof seedlings increased continuously. At 50mmol·L-1, it was roots > leaves > stems, and in other treatment groups was leaves > roots > stems. At the same time, the content of K+ in roots and leaves showed a trend of increasing firstly and then decreasing. The content of K+ in stems decreased in general, and the content of K+ in organs showed roots > leaves > stems. In addition, the selective ion transport capacity from root to stem and stem to leaf and the K+/Na+ ratio in each organ showed a decreasing trend. (3) With the increase of NaCl concentration, the contents of soluble sugar and soluble protein in leaves of C. retusus seedlings increased in general, and the proline content showed an upward trend and then a downward trend. It is concluded that under salt stress, the root system of C. retusus seedlings can balance the damage of salt stress by enlarging the root growth; the root system can prevent the salt damage by absorbing and accumulating Na+ to the above ground parts; the leaf and stem can increase theselective absorption and accumulation of K+, thereby increasing the ratio of K+/Na+ to slow down the physiological metabolism of salt damage.
keywords:Chionanthus retusus  NaCl stress  growth  distribution pattern of Na+ and K+  osmotic adjustment
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