华南地区8种藤本植物叶绿素荧光特性对模拟二氧化硫污染的响应

Responses of Chlorophyll Fluorescence to Simulated SO2 Pollution in Eight Liana Species in South China

摘要:

研究了模拟SO2处理对8种华南地区常见盆栽藤本植物离体叶片的叶绿素荧光参数、快速光强响应曲线(RLC)、叶片总抗氧化能力(清除有机自由基1,1-diphenyl-2-picrylhydrazyl 水平)和叶片色素含量的影响。结果表明，经过10 h的20 mmol/L NaHSO3浸泡，8种藤本植物离体叶片的Fv/Fm，ΦPSII，rETR，rETRmax和RLC初始斜率α与对照(纯净水浸泡)相比有明显下降。8种供试植物的叶片总抗氧化能力和叶片色素含量的变化存在种间差异。8种藤本植物中龙吐珠(Clerodendron thomsonae)、锦屏藤(Cissus sicyoides)和禾雀花(Mucuna birdwoodiana)是对模拟SO2抗性较强的绿化藤本植物，抗性较差的是首冠藤(Bauhinia corymbosa)、红花西番莲(Passiflora coccinea)和宝巾(Bougainvillea glabra)

Abstract:

We investigated the effects of simulated SO2 treatment on chlorophyll fluorescence parameters, rapid light-response curves, anti-oxidant capacity (1,1-diphenyl-2-picrylhydrazyl radical-scavenging capacity) and photosynthetic pigment contents in the excised leaves of eight liana species. After leaf sections were immersed in 20 mmol/L NaHSO3 for 10 h, Fv/Fm, ΦPSII, rETR, rETRmax and initial slope (α) of rapid light-response curves decreased compared with the controls (in purified water). Variation tendencies in anti-oxidant capacities and chloroplast pigment contents differed among species. It is deduced that Clerodendron thomsonae, Cissus sicyoides and Mucuna birdwoodiana had higher tolerance to simulated SO2 treatment, whereas Bauhinia corymbosa，Passiflora coccinea，Bougainvillea glabra were sensitive to simulated SO2 pollution.