荻在滨海区重盐碱胁迫下的生理响应

Physiological Response of Triarrherca sacchariflora Under Heavy Saline-Alkali Stress in Coastal Region

滨海地区高盐碱导致生态环境脆弱,与其经济的高速发展极不相适应,故开展耐高盐碱的植物研究刻不容缓.本文采用pH值为8.0、9.0,NaCl盐度在0、5、10、15、20下的溶液对荻进行胁迫处理,通过各项生理响应指标的变化来研究其耐盐碱性.结果表明：随盐碱度增加,荻叶片相对电导率和丙二醛含量呈增加趋势,增加幅度越大荻长势越差;荻体内渗透调节物质脯氨酸的增加趋势不明显,说明荻有耐盐碱性,而可溶性糖含量先降低后升高再降低,且在达峰值后下降明显,说明荻的耐盐碱能力有限;轻微盐碱刺激能促进荻光合色素含量和根系活力的升高,高盐碱抑制其升高.综合分析荻的各种生理表现,认为荻能耐受pH=8.0、盐度0～20和pH=9.0、盐度0～15的较宽盐碱范围,因此荻可作为修复滨海重盐碱地生态景观的备选植物.

Heavy saline-alkali stress results in a fragile ecological system in a coastal region. The phenomenon isn＇t coordinate with the rapid economic development of the coastal region. Therefore, it is very necessary to select plants that can grow in the heavy saline-alkali land. This paper used the combination of pH （8. 0, 9.0） and NaCl salinity （0, 5, 10, 15 and 20） solution to stress the growth of a Triarrherca sacchariflora, and determined its routine physiological response indexes to study the effects of saline-alkali stress. The results showed that the leaf relative conductivity and malondialdehyde content increased while salinity-alkalinity increased, the greater increase amplitude of them could cause the worse growth of the Triarrherca sacchariflora. The small increases of proline indicated that the Triarrherca sacchariflora could resist salinity-alkalinity increase. The variation trend of the soluble sugar content decreased first, in- creased and then decreased significantly after the maximum. The phenomenon indicated the tolerance of salinity-alkalinity of the Triarrherca sacchariflora was limited. Slight saline-alkali increase could promote the increase of photosynthetic pigment content and root activity while high saline-alkali increase inhibited their increase. Integrated considering various growth feature, the Triarrherca sacchariflora could tolerate a wide range of salt and alkali content which was pH of 8. 0, salinity of 0-20 and pH of 9.0, salinity of 0-15. Therefore, the Triarrherca sacchariflora could be used as an alternative plant for the remediation ecological landscape of coastal heavy saline-alkali land.