福建农业学报2016，Vol.31Issue(9)：939-944,6.DOI:10.19303/j.issn.1008-0384.2016.09.008
Cd胁迫对凹叶厚朴生物量及光合荧光特性的影响
Effects of Cd Stress on Biomass and Photosynthesis Fluorescence Characteristics o f Magnolia officinalis
摘要
Abstract
Two-year-old Magnolia officinalis seedlings were used in this experimentation.Effects of Cd stress on the biomass,chlorophyll SPAD value,and chlorophyll fluorescence characteristics,as well as Cd contents in various parts of the plant,under 5 gradients of Cd stress including 0 (CK),50,100,200,and 300 mg·kg-1 were studied to unveil the underlying mechanism.In the seedling plants and parts,it was found that the highest accumulated Cd concentrations (dry weight)were 325.76 mg·kg-1 in the roots,and 13.56 mg·kg-1 in the aboveground parts. In general,95.71%-96.23% of the total Cd accumulated on the plant were found in the roots. The seedling height decreased with increasing Cd concentration. Compared with CK,all treatment groups except 50 mg·kg-1 ,showed significant decreases on SPAD chlorophyll. When the Cd concentration was low,the plants appeared to adapt and continue to grow and metabolize. Nonetheless,the PSII maximum quantum yield (Fv/Fm),actual photochemical quantum yield (ΦPSⅡ),chemical quenching (qP),and electron transport efficiency (ETR)were significantly decreased due to high Cd stress as compared to CK indicating that the energy capture from the sunlight,ETR,PSII activity,and metabolism were all suppressed resulting in damage to the plant.关键词
Cd胁迫/厚朴/生物量/叶绿素SPAD/叶绿素荧光特征Key words
Cd stress/Magnolia officinalis/biomass/chlorophyll SPAD value/chlorophyll fluorescence characteristics分类
农业科技引用本文复制引用
陈剑成,罗睿,万娟,刘家琪,宋鹏,吴玉香,郑郁善,陈礼光..Cd胁迫对凹叶厚朴生物量及光合荧光特性的影响[J].福建农业学报,2016,31(9):939-944,6.基金项目
国家科技支撑计划（2011BAI01B06) （）
福建省科技重点项目（2009Y0003) （）
