Treatment of barley plants with “Epin-Extra” (active ingredient epibrassinolide) in field experiments, under conditions of prolonged drought, led to a decrease in the values of the fluorescent index (FM−FT)/FT in the first weeks after treatment, indicating the decrease in the photosynthetic activity of the plants. In vegetative experiments with barley, under conditions of optimal soil moisture, on the contrary, a stimulating effect of this growth regulator on the photosynthetic apparatus of plants was observed. In laboratory experiments with the ornamental plants of tagetes subjected to 3-day exposure to low temperatures (about 5 °C), a decrease in the fluorescent indices ФPSII, NPQ, and FM/FT, recorded using PAM fluorometry, was observed. It is assumed that this result testifies to disturbances of the structural and functional organization of the photosynthetic apparatus of plants known from the literature. After preliminary, before exposure to low temperatures, treatment of plants with preparations "Epin-Extra" and silicon-containing liquid organic fertilizer "Siliplant" no such disturbances were observed.
The influence of organo-mineral fertilizer «Ekofus» on the growth, development and fluorescent parameters of ornamental plants Tagetes patula L. has been studied. It was found that the treatment of tagetes plants with ekofus accelerated the transition of plants to the flowering phase and increased the productivity of flowering, plant height, plant and root biomass. At the same time, no significant differences in the fluorescent parameters of plants in 3–4 weeks after treatment with ekofus were found in control and experimental plants, which indicates the absence of differences in the functional characteristics of the photosynthetic apparatus at late vegetation periods. Repeated spraying of tagetes plants during this period (in the phase of mass flowering) was also ineffective in terms of increasing photosynthetic activity.
The treatment of bean seeds with epibrassinolide (the preparation “Epin-Extra”) resulted in the increase in fluorescent parameter (FM−FT)/FT of plants grown from these seeds, indicating the increase in the photosynthetic activity of the plants. The treatment of bean seeds with epin led to the increase in chlorophyll content and also in the acceleration of plant growth. Fluorescence quenching after switching on the actinic light in experimental plants was faster than in control ones which may indicate increased adaptive capabilities of the photosynthetic apparatus.
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