摘要
对龙船花Ixora chinensis、红背桂Excoecaria cochinchinensis、朱蕉Cordyline fruticosa进行苗期耐盐性评价,研究其生理机制,为筛选和利用具有优良耐盐性状的园林植物提供依据。设置对照(0)、0.3%和0.6%3个土壤Na Cl浓度水平,测定植物的生理指标,在此基础上采用主成分分析综合评价植物的耐盐性,并进行排序。研究结果表明:(1)随着盐胁迫时间的延长,在0.3%盐浓度的胁迫下,3种植物幼苗叶片的叶绿素含量、可溶性糖含量和SOD活性呈现递增的趋势;龙船花的脯氨酸含量上升,红背桂下降,朱蕉则先降后升;红背桂与龙船花幼苗叶片的可溶性蛋白含量持续递增,朱蕉先升后降;龙船花和朱蕉的MDA递增,红背桂先降后升。(2)在0.6%盐浓度的胁迫下,红背桂的叶绿素含量上升,其它2种植物先升后降;3种植物的脯氨酸含量和SOD活性先升后降;龙船花和红背桂的可溶性糖含量上升,朱蕉先升后降;龙船花的可溶性蛋白含量先升后降,其他植物上升;龙船花的MDA持续递增,红背桂则先降后升,朱蕉先升后降。(3)采用主成分分析法表明:0.3%和0.6%盐浓度胁迫下,3种植物幼苗的生理指标得分均为红背桂>朱蕉>龙船花,植株苗期的生理指标对盐胁迫浓度的变化响应灵敏,可以用于鉴定植物的耐盐性。
Salt-tolerance and physiological responses of Ixora chinensis, Excoecaria cochinchinensis and Cordylinefruticosa were evaluated under salt stress to explore the salt-tolerance of garden plants, which might be useful for selecting salt-tolerant garden plants. The physiological indexes of the three species were measured under salt stress of 0%, 0.3% and 0.6% NaCl in the soil. Their salt resistance was evaluated using principal component analysis method. The results showed that at 0.3% salt concentration, the chlorophyll content, soluble sugar content and SOD activity of seedlings of the three species tended to increase with increasing time of salt stress; Protein content of 1. chinensis increased, that of E. cochinchinensis decreased, whereas that of C. fruticosa decreased followed by an increase; Protein content of L chinensis and E. cochinchinensis seedlings continuously increased, and that of C. fruticosa increased followed by a decrease; MDA content of L chinensis and C. fruticosa tended to increase whereas that of E. cochinchinensis decreased followed by an increase. At 0.6% salt concentration, chlorophyll content of L chinensis and C. fruticosa increased and then decreased, whereas that of E. cochinchinensis increased; Poline content and SOD activity of seedlings of the three species increased and then decreased; soluble sugar content of I. chinensi and E. cochinchinensis increased, whereas that of C. fruticosa increased and then decreased; soluble protein content of/. chinensi increased and then decreased and that for other species increased; MDA content of/. chinensis continuously increased, that of E. cochinchinensis decreased followed by an increase, and that of C. fruticosa presented a trend of increase and then decrease. Principal component analysis was used to evaluate physiological indexes, and the results showed that at 0.3% and 0.6% salt concentration, physiological index score of seedlings of the three species decreased in the order of E. cochinchinensis 〉 C. fruticosa 〉 I. chinensis, Remarkable variations in salt tolerance were detected among the three species, which would provide a basis for utilization of salt tolerant garden plants.
作者
郑欣颖
李鹏飞
薛立
麦凝珺
蔡金桓
李秋静
ZHENG Xinying LI Pengfei XUE Li MAI Ningiun CAI Jinhuan LI Qiujing(College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, Guangdong, China Pubang Landscape Architecture Co Lt, Guangzhou 510642, Guangdong, China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2017年第9期62-67,共6页
Journal of Central South University of Forestry & Technology
基金
广州市科技项目(2014SY000010)
中央财政林业科技推广示范项目"广东省生态公益林培育技术推广"(2015-GDTK-07)
关键词
盐胁迫
生理指标
主成分分析
幼苗
salt stress
physiological index
principal component analysis
seedling
