منابع مشابه
Comparison of the Action of Bleaching Herbicides
Among chlorosis-inducing herbicides that interfere with carotenoid synthesis two groups o f different potency can be discriminated (group 1; aminotriazole amd haloxidine; group 2 with more extensive photodestructions: pyridazinone herbicides and difunon). After application of herbicides o f group 2 colored carotenoids were completely absent and preexisting chlorophyll was degraded by photochemi...
متن کاملInfluence of Bleaching Herbicides on Chlorophyll and Carotenoids
Bleaching Herbicides, Algae, Scenedesmus acutus, Carotenoids, Chlorophyll, Air/Nitrogen Gassing Over 24 and 48 hour cultivation periods the influence of SAN 9789 (norflurazon), EMD-IT 5914 (difunon) and fluridone on growth, photosynthetic oxygen evolution and pigment content of the green alga Scenedesmus acutus was determined. Four effects were observed: a) Both carotenoid and chlorophyll forma...
متن کاملBansformation of tobacco with a mutated cyanobacterial phytoene desaturase gene confers resistance to bleaching herbicides.
Carotenoids are constituents of the photosynthetic apparatus and essential for plant survival because of their involvement in protection of chlorophylls against photooxidation. Certain classes of herbicides are interfering with carotenoid biosynthesis leading to pigment destruction and a bleached plant phenotype. One important target site for bleaching herbicides is the enzyme phytoene desatura...
متن کاملIn vitro and in situ inhibition of carotenoid biosynthesis in Capsicum annuum by bleaching herbicides.
Pepper leaves treated with the herbicide J852 show an accumulation of phytoene and zeta-carotene, whereas treatment with norflurazon led to an accumulation of only phytoene. The effects of these herbicides were examined in vitro after the expression of carotenoid desaturases in Escherichia coli. Whereas norflurazon is a potent inhibitor of phytoene desaturase (PDS) (I(50) = 0.12 microM) but not...
متن کاملInhibition of Phytoene Desaturase — the Mode of Action of Certain Bleaching Herbicides
Assay systems have been developed in order to differentiate between the m odes o f action o f certain bleaching herbicides. These include inhibition o f chlorophyll or carotenoid biosynthesis, and initiation o f pigment degradation. Herbicidal com pounds with phytoene desaturase as their primary target site were investigated in a cell-free carotenogenic system from Aphanocapsa. In a comparative...
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ژورنال
عنوان ژورنال: Journal of Pesticide Science
سال: 2007
ISSN: 1348-589X,1349-0923
DOI: 10.1584/jpestics.32.61