title: [Increase in the phosphorescence and delayed fluorescence of chlorophyll in barley leaves after selective suppression of carotene biosynthesis].
abstract: The action of inhibitors of carotenoid biosynthesis--herbicides SAN 9789 and SAN 6706 on the pigment composition and chlorophyll low temperature (-196 degrees) delayed luminescence (delayed fluorescence and phosphorescence) has been studied in the barley leaves. The herbicides were introduced into etiolated leaves before greening. It is shown that in the mature leaves which were developed in the presence of herbicides biosynthesis of alpha, beta and gamma carotenes is selectively blocked while the concentration of xanthophylls and chlorophylls is not essentially changed. The lack of carotenes is accompanied by an increase of the quantum yields of chlorophyll phosphorescence and delayed fluorescence by the factors of 10 and 6 respectively. The data suggest that carotenes and xanthophylls take an approximately equal part in quenching the chlorophyll triplet states in normal chloroplasts.
mesh_terms: D002338:Carotenoids / Q000502:physiology*; D002734:Chlorophyll / Q000502:physiology*; D003080:Cold Temperature; D005453:Fluorescence; D006540:Herbicides / Q000494:pharmacology; D049449:Luminescence; D010788:Photosynthesis; D011724:Pyridazines / Q000494:pharmacology
chemical_list: D006540:Herbicides; D011724:Pyridazines; D002734:Chlorophyll; D002338:Carotenoids; C008677:norflurazone; C001602:metflurazon
vernacular_title: Usilenie fosforestsentsii i zamedlennoĭ fluorestsentsii khlorofilla v list'iakh iachmenia pri izbiratel'nom podavlenii biosinteza karotinov.