Fluorescent indices of barley and tagetes plants treated with physiologically active compoundsстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация: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.