2. Articole

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    Impact of non-optimal temperature and bioregulator on root and seedling vigour of corn [Articol]
    (Editura USM, 2025) Ivanova, Raisa; Lutcan, Elena; Vanicovici, Nicolai; Borovskaia, Ala; Elisovetcaia, Dina
    Take into account that the corn vigour has the strong correlated field emergence and yield, the purpose of this work was to evaluate the combined influence of non-optimal temperatures and a natural bioregulator on the vigour of corn root and seedling. The seeds of Porumbeni 455 corn hybrid pre-treated with natural bioregulator (JS) extracted from Juniperus sabina were subjected to treatment at 50°C (heat test) and at 10°C (cold test). The vigour of root and seedling was assessed after seed germination. Temperature above the optimum significantly affected both the vigour of root and the vigour of seedling, but temperature below the optimum only reduced the root vigour of the tested corn hybrid. The JS bioregulator contributed to an increase in root system vigour. Corn seeds pre-treated with JS had root vigour greater than untreated ones by 13.08 and 18.46%, respectively in the cold and heat test. The evaluation of factor impact showed that the temperature influenced both the root and seedling vigour more than the treatment with the bioregulator, and their combined effect significantly modified only the root vigour.
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    Screening of corn genotypes for salinity resistance [Articol]
    (Editura USM, 2025) Climenco, Oxana
    The aim of the study was to evaluate salt resistance of corn lines and hybrids at early stages of plant growth and development, as well as at the level of haploid male gametophyte. Under stress conditions of chloride salinity, the variability of such traits as "seed germination", "seedling length", "rootlet length", "number of rootlets" was studied. Correlations and regressions of traits, effects of the factors "genotype", "salinity stress", as well as their interaction were assessed. As a result, reliable positive correlations of the studied traits of early growth and development under salt stress were established, and reliable effects of the "genotype" factor in the variability of traits at the diploid and haploid levels were determined. The hybrid combination with the maternal component L276xP165, as well as the lines P343, L1866, Mo17, Co125 turned out to be genotypes with increased salt resistance.
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    Research on corn tolerance to drought and heat in the context of changing plant-soil-water-air relationships caused by climate change
    (CEP USM, 2024) Spinu, Angela
    The study in this thesis evaluated a set of maize genotypes (simple hybrids) in field and laboratory conditions with different hydric stresses in different localities using a welldefined drought index to identify higher resistance/tolerance traits to drought and heat with a direct impact on final production.