生态环境学报2016，Vol.25Issue(2)：233-240,8.DOI:10.16258/j.cnki.1674-5906.2016.02.008
菊芋对酸铝复合胁迫的生理响应
Physiological Responses of Helianthus tuberosus to Acid-aluminum Stress
摘要
Abstract
A solution culture experiment was conducted to study the effects on root growth, leaf photosynthetic characters, antioxidant enzyme activities, soluble sugar, and MDA content of two Helianthus tuberosus, Nanjing (aluminum tolerance genotype) and Ziyang (aluminum sensitivity genotype), under acid-aluminum stress. The result showed that the pH of solution and concentration of aluminum had distinct effects on physiology of Helianthus tuberosus. The normal growth of Helianthus tuberosus was affected by different pH ever under the minimal aluminum concentration. Compared with the control group, root length of Helianthus tuberosus was significantly inhibited, but there was little difference between the two genotypes. Root activity increased, while chlorophyll content, maximum energy conversion efficiency (Fv/Fm), and electron transport rate were significantly decreased in both genotypes of Helianthus tuberosus. SOD, POD, and CAT activity showed opposite trends. The inhibition on Helianthus tuberosus (Ziyang) was significantly less than that of Helianthus tuberosus (Nanjing), indicating the differences between the two genotypes in aluminum tolerance. Initial flurescence (F0), soluble sugar, and MDA content were increased, while qP and qN showed opposite trends. With the increasing of aluminum concentration, the differences of physiological indicators between aluminum treated group and control group of Helianthus tuberosus increased. Under the same concentration of aluminum, the root activity increased, chlorophyll a decreased, F0 increased, soluble sugar content decreased, SOD activity and MDA content increased when it was under pH4 compared to pH5. Under different aluminum concentration, the physiological indicators of Helianthus tuberosus were significantly different. Roots activity and antioxidant enzyme activity were raised with increasing aluminum concentration. It can be deduced that the antioxidant enzyme system and root absorption mechanism played an important role in relieving acid and aluminum stress. Through the grey correlation analysis, the closest indicators with the acid and aluminum stress of Helianthus tuberosus was chlorophyll qN, followed by ETR, MDA, and Fv/Fm.关键词
菊芋/酸铝胁迫/光合特性/抗氧化酶Key words
Helianthus tuberosus/Acid Aluminum stress/photosynthesis/antioxidant enzyme分类
资源环境引用本文复制引用
曹林,马丽,吴玉环,李学良,郭怡,章艺,郦枫,徐根娣,刘鹏..菊芋对酸铝复合胁迫的生理响应[J].生态环境学报,2016,25(2):233-240,8.基金项目
国家自然科学基金项目（41541049；41461010；30540056）；浙江省自然科学基金项目 （）
