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The current article presents the results of the influence of lighting conditions on the morphogenetic potential of Ipomoea batatas (L.) microcuttings in vitro. The studied objects were 4 sweet potato cultivars - Jewel, Purple, Porto Rico, Vinnitsa pink. Microcuttings of I. batatas were cultivated in vitro. We used nutrient medium with mineral salts (according to the prescription of Murashige and Skoog (MS)) and medium only with distilled water (without mineral salts). All nutrient media contained sucrose 2% and agar 0.7%. Hormones were not added to the nutrient media. We studied the influence of the different red (R) and far red (FR) ratios, as well as the red and blue light spectrum on the formation of microshoots and the root system. It was shown that the lighting regimes (R and FR ratio) had a stimulating effect on the roots and shoots growth regardless of the medium composition. Moreover, significant results were obtained under conditions of complete nutrition (mineral salts according to MS) in contrast to the control treatment (fluorescent lamps) and the treatment without salts. The best results were obtained at the R=FR treatment. This light treatment can be recommended for inclusion in the technology of clonal micropropagation of sweet potato. When red and blue spectra were added to normal illumination in different proportions, it did not lead to an increase in the morphogenetic potential of cultivated explants. The growth rate (μ) of the main shoot from axillary buds was about 2 times less than in the control treatment.

Fusarium oxysporum fungus is the pathogen that causes wilts or root and crown rots on many economically important field crops, causing significant losses to agricultural production. The use of plant extracts to control this fungus is an alternative to synthetic fungicides. Black cardamom (Amomum tsao-ko Crevost et Lemairé), which belongs to the monophyletic Zingiberaceae family, is a valuable medicinal plant in Vietnam. The antifungal activity of black cardamom seed extract has been reported in several previous studies. This study aimed to determine the antifungal activity of black cardamom extracts against the F. oxysporum fungus. The fungicidal effects of black cardamom extracts (including ethanol extract of leaf, seed, rhizome + root, and pseudo-stem) concentrations of 50 and 100 mg/L were investigated. Results indicated that the black cardamom extracts had different fungicidal effects on the growth of F. oxysporum mycelium. A significant inhibitory effect on the growth of F. oxysporum mycelium was obtained using the seed extract at a concentration of 100 mg/L. In addition, in the variant with the use of the extract obtained from the seeds, the lowest indicator of the specific growth rate (m) of the fungus was observed. The antifungal components from black cardamom plant could be used in developing novel fungicides (biopesticides) for the diseases caused by F. oxysporum.