Articles
EFFECTS OF PESTICIDE ON THE CHLOROPHYLL FLUORESCENCE PARAMETERS IN NO-HEADING CHINESE CABBAGE
Article number
856_28
Pages
211 – 216
Language
English
Abstract
To probe pollution ecology effects of pesticide in vegetables, the chlorophyll fluorescence transients were measured by a Plant Efficiency Analyzer (PEA; Hansatech Ltd., Kings Lynn, Norfolk, England) in no-heading Chinese cabbage, and the activity of photosystem II (PS II) was analyzed by the fluorescence transient (the JIP-test). Three pestcides, including phorate, phoxin and cypermetrin, were sprayed on the leaves of no-heading Chinese cabbage.
The results showed that on the third day after treatments, these pesticides could promote reducing from primary quinone acceptor QA to QA– in PS II, e.g., increasing parameters in relation to J phase, i.e., relative variable fluorescence at the J-step (VJ) and approximated initial slope of the fluorescence transient (Mo). Meanwhile they prohibited electron transmission from QA– to QB in PS II, e.g., sharply decreasing parameters of electron transport flux per PS II reaction center (ETo/RC), probability that a trapped exciton moved an electron into the electron transport chain beyond QA– (
o) and quantum yield of electron transport (φEo), and further resulted in sharping decrease of driving force on absorption and cross section basis of PS II (DFABS and DFCS), respectively.
Effects of phorate on the above parameters showed that dynamic change of residuals was significant and strongly related to the dosage, which would be loss of effect gradually from the fifth day after treatment.
The results showed that on the third day after treatments, these pesticides could promote reducing from primary quinone acceptor QA to QA– in PS II, e.g., increasing parameters in relation to J phase, i.e., relative variable fluorescence at the J-step (VJ) and approximated initial slope of the fluorescence transient (Mo). Meanwhile they prohibited electron transmission from QA– to QB in PS II, e.g., sharply decreasing parameters of electron transport flux per PS II reaction center (ETo/RC), probability that a trapped exciton moved an electron into the electron transport chain beyond QA– (
o) and quantum yield of electron transport (φEo), and further resulted in sharping decrease of driving force on absorption and cross section basis of PS II (DFABS and DFCS), respectively.Effects of phorate on the above parameters showed that dynamic change of residuals was significant and strongly related to the dosage, which would be loss of effect gradually from the fifth day after treatment.
Authors
Z.K. Gao, T. Zhao, M. Wang, W.L. Zhang, J.P. He, R.F. Gao
Keywords
PEA, JIP-test, pesticide residual, pollution ecology, Photosystem II
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