Effects of DDT on photosynthetic electron flow in Secale species |
| |
Authors: | Sher Akbar Lyndon J. Rogers |
| |
Affiliation: | Department of Biochemistry and Agricultural Biochemistry, The University College of Wales, Aberystwyth, Dyfed, SY23 3DD, Wales, U.K. |
| |
Abstract: | Following a survey of a range of varieties of rye, mainly Secale cereale, for reaction to DDT, the mode of action of the pesticide in a susceptible variety was studied. Two sites of interaction of DDT with the photosynthetic electron transport chain were demonstrated. The first site of inhibition was on the oxidizing side of photosystem 2, between the sites of electron donation from diphenylcarbazide at pH 6.0 and pH 8.0 in Tris-washed chloroplasts. The second site of DDT inhibition was in the intermediate electron transport chain, and was demonstrated by using dichlorophenol-indophenol and phenyldiamines as electron donors in chloroplasts where electron flow from photosystem 2 was inhibited by 3-(3,4-dichlorophenyl)-1,1-dimethylurea. The sites are distinct from those characteristic of herbicides which affect photosynthetic electron flow. |
| |
Keywords: | Gramineae rye DDT photosynthesis photosynthetic electron flow. DBMIB, 2,5-dibromo-3-methyl-6-isopropyl-1,4-benzoquinone DCMU, 3-(3,4-dichlorophenyl)-1,1-dimethylurea DPC, diphenylcarbazide DCIP, 2,6-dichlorophenolindophenol MV, methyl viologen PMS, phenazine methosulphate |
本文献已被 ScienceDirect 等数据库收录! |
|