Effects of SO2 fumigations on photosynthetic CO2 gas exchange, chlorophyll a fluorescence emission and antioxidant enzymes in the lichens Evernia prunastri and Ramalina farinacea

被引：53

作者：

Deltoro, VI ^{[1
]}

Gimeno, C ^{[1
]}

Calatayud, A ^{[1
]}

Barreno, E ^{[1
]}

机构：

[1] Univ Valencia, Fac Ciencias Biol, Inst Cavanilles Biodiversitat & Biol Evolut, E-46100 Burjassot, Spain

来源：

PHYSIOLOGIA PLANTARUM | 1999年 / 105卷 / 04期

关键词：

D O I：

10.1034/j.1399-3054.1999.105408.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The effects of elevated gaseous SO2 concentrations in the lichens Evernia prunastri (L.) Ach. and Ramalina farinacea (L.) Ach. were investigated by means of gas exchange, modulated chlorophyll fluorescence analysis and antioxidant enzyme assays. The response to SO2 of the studied species differed markedly. Net photosynthetic rates were more adversely affected in E, prunastri than in R, farinacea. In addition, processes dependent on thylakoid membrane integrity such as PSII-mediated electron flow and nonphotochemical quenching were reduced to a greater extent by exposure to SO2 in E. prunastri. Moreover, the ability to reoxidize the quinone pool was loner in this species. Finally, the activity of chloroplastidic and cytoplasmic antioxidant enzymes was decreased in E, prunastri in response to fumigations but increased in R, farinacea. The results suggest that the ability to process and deal with the SO2 once it has been absorbed must play a role in determining the sensitivity of these lichen species to this air pollutant.

引用

页码：648 / 654

页数：7

共 55 条

[1] THE RESPONSE OF PHASEOLUS-VULGARIS L CV LIT TO DIFFERENT DOSAGES OF THE ANTI-OZONANT ETHYLENEDIUREA (EDU) IN RELATION TO CHRONIC TREATMENT WITH OZONE [J].