2. Articole

Permanent URI for this collectionhttps://msuir.usm.md/handle/123456789/13419

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    Influence of the Fusarium oxysporum fungus on the transgressive potential of growth traits of common wheat [Articol]
    (Editura USM, 2025) Lupascu, Galina; Cristea, Nicolae; Gavzer, Svetlana
    The purpose of the research was to establish the reaction of 7 parents, 4 pairs of F2 hybrids of common winter wheat, obtained based on 4 pairs of reciprocal F1 hybrids, and the transgressive potential of growth and development organs to the treatment of grains with Fusarium oxysporum culture filtrate. The pathogen was isolated from wheat plants with root rot symptoms and identified by macro- and microscopic methods. The culture filtrate (CF) was prepared on the basis of Cszapek liquid medium. After treating the grains for 18 hours with CF, the seedlings were cultivated for 6 days, after which morphometric analyses of growth characters were performed. Plant distribution histograms were analyzed according to variant and character. The degree (Tg), the frequency (Tf) of transgressions were calculated and the important role of the plant-pathogen interaction mode, the parental factor in the spectrum of phenotypic classes and transgressive manifestations in segregating populations were found.
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    Identificarea relațiilor dintre parametrii ce contribuie la diferențierea răspunsului tomatelor la deficit hidric
    (CEP USM, 2024) Mărîi, Liliana; Andronic, Larisa; Sahanovschih, Marionela; Ionașcu-Urechii, Angela
    The study aims to analyze the conventionally associated reactions between different quantitative indices in the formation of the plant's response to drought (PEG 6000) in tomato sprouts. The results indicate a moderate positive correlation between PEG6000 concentration (0, 10, 12%) and seed germination rate in 10 genotypes. A significant decrease in seedling and radicale length (18-67%) was observed under stress conditions, with a stimulation of lateral and adventitious radicale formation. Principal Component Analysis (PCA) for 9 quantitative indicators in 5 tomato genotypes identified that the first three principal components explain 82.3% of the variability, presenting combinations of traits with diametrically opposite effects, some increasing the variance of the data field and others, on the contrary, decreasing it, thus differentiating the genotypes in the coordinate plane based on their response to optimal conditions or stress as determined by the principal components. This fact allows us to highlight the indicators that are relevant in estimating the genotype's reaction to stress.