2. Articole

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

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Subject: search.filters.subject.drought

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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.
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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.
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    Influenţa deficitului hidric asupra germinării seminţelor unor genotipuri de grâu
    (CEP USM, 2024-10-07) Jelev, Natalia
    In order to determine the parameters that can be used as a rapid criterion for assessing drought resistance, the present investigation was carried out to evaluate six wheat genotypes, to the stress of drought induced by polyethylene glycol during germination and seedling growth. Seven parameters characterizing the germination processes were studied; germination energy, germination capacity, speed of germination, speed of accumulated germination, coefficient of the rate of germination, mean germination time, vigor index and two growth parameters; root length and shoot height were measured under the experimental conditions. The average comparison showed that the highest value for the majority were recorded for the genotypes Moldova 16, Moldova 614 and Lăutarii.
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    Selection of resistant maize genotypes under salt stress and drought conditions
    (CEP USM, 2024-10-07) Climenco, Oxana
    The variability of the characters "seedling length" and "root length" at the initial stages of plant development depended significantly on the factors "genotype", "abiotic stress" and on the interaction "genotype x stress". The effect of the factor "genotype" was at a high level for the characters "number of branches in the panicle" and "panicle length". The values of the effect of the factor "genotype" for the characters "number of rows per cob" and "number of grains per row" were at an average level. Under osmotic stress conditions only two hybrids with the maternal line L1866 had the relatively high values of the «pollen grain diameter» character. Under saline stress conditions, the effects of both the "stress" factor and the "genotype x stress" interaction were significant. The highest values of the studied character demonstrated hybrids with paternal genotypes lines B73 and W23.
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    PARTICULARITĂȚILE RĂSPUNSULUI GENOTIPURILOR DE TOMATE SUB ACȚIUNEA INFECȚIILOR VIRALE ȘI A DESCENDENȚILOR ACESTORA LA STRESUL ABIOTIC
    (CEP USM, 2023) Mării, Liliana; Andronic, Larisa; Smerea, Svetlana; Rudacova, Angela; Cherdivară, Ala; Rudacov, S.; Sahanovschih, Marionela
    The evaluation of some polyvalent biochemical indicators under optimal conditions and heat or drought highlighted specific aspects if these plants came from parents infected with Tobacco Mosaic Virus (TMV) or Tomato Aspermy Virus (TAV). Thus, depending on the genotype, in both infected plants and their descendants, the POX values were usually higher or lower than the control group. The origin of the plants (control, TMV, TAV) had the largest contribution in the variability of H2O2 and stress for POX, respectively 74,1 and 23,6 %, and the combinations of the factors genotype, stress and origin had a considerable impact on the H2O2 content.