IMPORTANT CORRELATION INTERDEPENDENCES BETWEEN THE COMPLEX ECONOMIC AND VALUABLE CHARACTERISTICS OF F1 COURGETTE HYBRIDS IN THE ASPECT OF THEIR ADAPTIVE POTENTIAL
The aim of the research. Determine the degree of correlation between the quantitative characteristics of F1 courgette hybrids valuable for ecological breeding: the values of the hydrothermal coefficient (HTC) by years of research and the characteristics of F1 hybrids, which are structural components of yield; “Zucchini yellow mosaic virus” (ZYMV) and similar indicators related to powdery mildew, bacteriosis and other viral infections affecting zucchini F1 hybrids in the field. Methods. Field, laboratory, computational and statistical. Results. Breeding work was performed with 18 hybrids F1 courgette of foreign origin. A correlation analysis was performed between the response of hybrid samples to ZYMV virus infection in the laboratory and the manifestation of other diseases that occurred in the field. It was found that the highest level of correlation is observed when comparing the degree of field viral diseases and symptoms of yellow mosaic virus (15 statistically confirmed values of the pairwise correlation coefficient or 80.33%). There were 8 hybrids F1 courgette hybrids, in which statistically significant correlations were observed for all pairs of traits. Among them, Alfresco F1, Rimini F1, Eight Ball F1, Firenze F1, Tuscany F1, Parador F1, Gold Rush F1, Cronos F1 (-0.50 <rp <0.95). Three hybrids, Mikinos F1, Jaguar F1 and Best of British F1, showed low dependence on hydrothermal growing conditions. The first two hybrids did not have a linear correlation with HTC (rp < 0.1) in terms of 3 quantitative characteristics: "Total yield", "Commodity yield" and "Total productivity of one plant". The Best of British F1 hybrid showed weak correlations (0.1 < rp < 0.3) between HTC and three traits: "Total yield", "Total productivity per plant" and "Average marketable fruit weight". Other F1 hybrids were highly dependent on hydrothermal growing conditions, as most of the quantitative traits that were structural components of yield showed moderate, strong, or very strong correlations with p HTC (0.5 < rp < 0.99). Conclusions. The analysis of correlations revealed a rather complex genetic organization of quantitative traits and their interaction with biotic and abiotic environmental factors. The obtained data will significantly facilitate further work on the prediction of adaptive potential for the analyzed set of quantitative traits in intermediate forms of courgette, created on the basis of studied hybrid genotypes that showed a stable phenotypic response to the applied growing conditions.
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