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Action of propanil on in vivo chlorophyll a fluorescence in Echinochloa crus‐galli and rice
Author(s) -
DANIELL H.,
SAROJINI G.,
KUMARACHINNAYAN P.,
KULANDAIVELU G.
Publication year - 1981
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1981.tb00113.x
Subject(s) - propanil , echinochloa , echinochloa crus galli , weed , chlorophyll fluorescence , photosynthesis , chlorophyll , cyperus , chemistry , dcmu , dry weight , crop , paddy field , agronomy , horticulture , biology , botany , weed control , photosystem ii
Summary: When sprayed as a post‐emergent, foliar herbicide propanil destroyed Echinochloa 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 both rice and E. crus‐galli , at lower concentrations propanil inhibited the electron flow in a manner similar to that of DCMU, but 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% while 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. This suggests that the crop has also an effective endogenous detoxifying mechanism.