The prompt effect of pyridazinone herbicides on the primary processes of photosynthesis

Herczeg, T.; Lehoczki, E.; Szalay, L.

doi:10.1016/0014-5793(79)81215-6

Cited by 9 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported by Kunert and Boger (13), application of norflurazon first inhibits carotene formation in Scenedesmus, \vhereas oxygen evolution is not rapidly impaired (beginning 4 h after application). Our fluorescence data show that neither BAS 29095 nor norflurazon inhibit the water-splitting reaction as claimed by Herczeg et al (8). Otherwise, a decrease in the maximum fluorescence level should be observed (4).…”

Section: Discussionsupporting

confidence: 63%

Sites of Herbicidal Action on Photosynthesis: A Fluorescence Assay Study

1981

View full text Add to dashboard Cite

The effect of the bleaching and non-bleaching phenylpyridazinones, norflurazon [4-chloro-5-(methylamino)-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone] and BAS 29095 [4,5-dimethoxy-2-phenyl-3(2H)-pyridazinone], on chlorophyll fluorescence of the green alga,Scenedesmus acutus, was investigated and compared to other bleaching herbicides, difunon3[EMD-IT 5914, 5(dimethylamino-methylene)-2-oxo-4-phenyl-2,5-dihydrofuranecarbonitrile-(3)] and the diphenyl ether, oxyfluorfen [2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene]. Following chlorophyll fluorescence during short-term cultivation in the presence of herbicides and comparing it to physiological parameters such as chlorophyll content and packed cell volume allowed for rapid screening to detect different primary herbicidal modes of action. Two primary bleaching effects caused by either inhibition of carotene biosynthesis (certain substituted pyridazinones and difunon) or peroxidative degradation of membrane lipids (certain diphenyl ethers) led to completely different fluorescence signals. Growth of algae in the presence of a carotene biosynthesis inhibitor resulted in a rapid rise to maximum fluorescence, followed by a single decay phase, whereas bleaching diphenyl ethers led to a rapid loss of total fluorescence. Non-bleaching phenylpyridazinones, which act as weak electron transport inhibitors, inhibited variable fluorescence. Detoxication during algal growth became evident by recovery of the fluorescence induction.

show abstract

Section: Discussionsupporting

confidence: 63%