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Action of propanil on in vivo chlorophyll a fluorescence in echinochloa crus galli and rice



Action of propanil on in vivo chlorophyll a fluorescence in echinochloa crus galli and rice



Weed Research 21(3-4): 171-178



When sprayed as a post-emergent, the foliar herbicide propanil destroyed E. crus-galli (L.) with little or no visible injury to rice, confirming its selective contact action. In treated rice leaves there was, however, a temporary decrease in dry weight, pigments, proteins and photosynthetic products followed by complete recovery in 4-5 days. In rice and E. crus-galli at lower concentrations, propanil inhibited the electron flow in a manner similar to that of DCMU [3-(3,4-dichlorophenyl)-1,1-dimethyl urea]; at higher concentrations, it damaged the primary electron donor. In vivo chlorophyll a fluorescence kinetics determined at various times after spraying 1% propanil in the field confirmed progressive weed deterioration. Rice leaves showed a decreased fluorescence for a few hours but exhibited partial recovery from the effects of propanil within 6 h and total recovery within 48 h after spraying. When the leaves were infiltrated with propanil solutions there was good recovery of fluorescence in both weed and crop leaves at 0.01%; at 1%, both were drastically affected. With 0.1% propanil, fluorescence in the weed leaves deteriorated progressively while the crop leaves recovered after 4 h of incubation. Apparently, the crop also has an effective endogenous detoxifying mechanism.

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Accession: 004660869

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