关键词：
半红树植物;玉蕊;潮汐系统;盐胁迫;生理响应;相关性分析
摘 要：
为了探究潮汐系统下半红树植物玉蕊对盐胁迫的生理响应及其各生理指标之间的相关性,选取2年生玉蕊幼苗,采用人工模拟半日潮,在温室分别以8个不同水体盐度对玉蕊幼苗进行盐胁迫处理,研究盐胁迫对玉蕊外观形态、SOD活性、POD活性、脯氨酸含量、丙二醛含量的影响,以获得玉蕊适生的盐度范围,为玉蕊抗盐育种、栽植区域及人工造林提供理论依据。结果表明:0‰～14‰的水体盐度处理并未影响玉蕊的生长发育进程,各处理后幼苗株高和地径均有所增长,叶片数目有升有降,处理21 d后全为绿叶株,存活率100%。随着水体盐度的增高,株高总增量受到极显著影响(P <0.01),但不同盐度对地径和叶片数影响不显著。叶片SOD活性无显著变化,POD活性变化与丙二醛、脯氨酸变化一致,均随着盐度的增高整体呈显著上升趋势(P <0.01)。另外,幼苗株高与不同盐度呈极显著负相关(P <0.01),叶片脯氨酸含量与不同盐度呈极显著正相关(P <0.01),与丙二醛含量呈显著负相关(P <0.05)。综合分析可见脯氨酸、POD是玉蕊响应盐胁迫的重要指标;玉蕊的适生盐度范围是0‰～8‰,适生的临界盐浓度是10‰,盐度10‰～14‰范围表现出较好抗盐性,表明玉蕊对0‰～14‰浓度的盐胁迫具有一定的耐受性和适应性,在构建红树林湿地景观上具有良好的应用前景。
译 名：
Physiological response of endangered semi-mangrove Barringtonia racemosa to salt stress and its correlation analysis
作 者：
LIANG Fang;HUANG Qiuwei;YU Yanping;LIANG Hui;HUANG Qiuyan;LIU Ximei;CHEN Qiuyou;TAN Xiaohui;Yulin Normal University;Guangxi Subtropical Crops Research Institute;
关键词：
semi-mangrove plants;;Barringtonia racemosa;;tidal system;;salt stress;;physiological response;;correlation analysis
摘 要：
In order to explore the physiological response of Barringtonia racemosa to salt stress in the lower half of the tidal system and the correlation among its physiological indexes, two-year-old Barringtonia racemosa seedlings were selected and treated under salt stress in greenhouse with eight different salinities of water body by artificial simulation of half-day tide. The effects of salt stress on appearance, SOD activity, POD activity and proline content of Barringtonia racemosa were studied. The effects of malondialdehyde content on the salinity range of Barringtonia racemosa can provide theoretical basis for salt tolerance breeding, planting area and artificial afforestation of Barringtonia racemosa. The results showed that the salinity treatment of 0‰-14‰ water did not affect the growth and development of Barringtonia racemosa. The height and diameter of seedlings increased, and the number of leaves increased or decreased. After 21 days of treatment, all the plants were green, and the survival rate was 100%. With the increase of water salinity, the total increment of plant height was significantly affected(P < 0.01), but different salinities had no significant effect on ground diameter and leaf number. There was no significant change in SOD activity in leaves, and the change of POD activity was consistent with that of malondialdehyde and proline, which showed a significant upward trend with the increase of salinity(P < 0.01). In addition, seedling height was negatively correlated with different salinity(P < 0.01), leaf proline content was positively correlated with different salinity(P < 0.01), and negatively correlated with malondialdehyde content(P < 0.05). The comprehensive analysis showed that proline and POD enzymes were important indicators of response to salt stress. The suitable salinity range was 0‰-8‰, the critical salinity concentration was 10‰, and the salinity range was 10‰-14‰. The results showed that Barringtonia racemosa had a certain tolerance and adaptability to salt stress of 0‰-14‰ concentration, and had a good application prospect in the construction of mangrove wetland landscape.
