Phenylboronic acid is known to interact with the membranes of various fungal cells through the carbohydrates that make up the cell membrane. Phenylboronic acid is a commercially available and pharmaceutically acceptable substance that in certain concentrations has a fungicidal effect on several species of human fungi, is not toxic to the environment and mammals and has an antitumor effect. Among other sources, boric acid can be found in plants, including almost all fruits. One such chemical may be phenylboronic acid (PBA), a phenyl derivative of medicinally important boric acid (BA). The problem is being addressed by research to identify environmentally friendly chemicals with as high an antibiotic efficacy as possible. The basic problem in modern plant production is a very poor choice of available agents for control of phytopathogenic fungi, as well as development of fungal resistance to the agents in use. Therefore, we conclude that BA, and even more so PBA, may be used as agents for controlling early blight on tomato plants, as they are both quite effective and environmentally friendly. Phenylboronic acid was more efficient in suppressing the impact of A. They did it by reducing the amount and severity of early blight symptoms, as well as by preventing deterioration of the physiological traits, occurring upon fungal inoculation. By following the appearance and intensity of the lesions on leaves of the tested plants, as well as by measuring four selected physiological factors that reflect plant health, we have shown that both BA and PBA act prophylactically on fungal infection. Here, we tested the activity of boric acid (BA) and its derivative phenylboronic acid (PBA) in controlling the early blight symptoms in tomato plants infected with pathogenic fungus Alternaria alternata. Therefore, intensive research has been conducted globally to uncover environmentally friendly and efficient agents that can suppress pathogens resistant to the currently used antimycotics. Finding a suitable alternative to the small pool of existing antifungal agents is a vital task in contemporary agriculture.
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