[Increase in the phosphorescence and delayed fluorescence of chlorophyll in barley leaves after selective suppression of carotene biosynthesis].

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.

[Chlorophyll phosphorescence in chloroplasts and their fragments].

Spectral parameters, decay time and quantum yield of low temperature (--196 degrees) delayed luminescence of chloroplasts and chloroplasts fragments have been investigated. It has been shown that the fragments enriched in photosystem 2, photosystem 1 of stroma or grana, obtained by differential centrifugation after digitonin treatment produce a delayed emission with components similar to that of initial chloroplasts, normal leaves and alga; i. e.

[Chlorophyll phosphorescence in leaves and cells of algae].

Phosphorescence and delayed fluorescence of chlorophyll have been observed in frozen suspensions of green, blue-green and red alga, normal and mutant leaves of pea, kidney bean and maize at the temperature range from --196 to --70 degrees C. The phosphorescence maximum lies at 960--980 nm, excitation maximum--at 674+/-2 nm, lifetime is 1.5--2.