ADAPTIVE POTENTIAL OF COURGETTE LINES OF FOREIGN ORIGIN BY THE COMPLEX OF TRAITS OF PRODUCTIVITY

Keywords: courgette, line, adaptive potential, quantitative traits, breeding value of the genotype

Abstract

The aim. To assess the adaptive potential of courgette lines of foreign origin according to the complex of productivity traits. Methods. The object of research is 20 courgette lines (generation F6I6), created on the basis of samples of foreign breeding (USA, Great Britain, Spain and Italy). The standard is the domestic variety Chaklun (K-1768). For evaluation parameters of adaptive capacity and environmental plasticity of lines used the following indicators: general and specific adaptive capacity of the genotype (GACi and SACi); relative stability (Sgi); coefficient of environmental plasticity factor (bi); breeding value of the genotype (BVGi). Results. As a result of the experimental work, 4 promising courgette lines were identified (VL-90 (K-1986), VL-91 (K-1994), VL-92 (K-2005) and LK 17-48 (K-2038)), which had a number of advantages over the standard variety in the manifestation of the traits “Total yield” and “Total productivity of one plant”. The best in terms of a set of indicators was the line VL-90 (K-1986), in which the level of manifestation of the trait “Total yield” was 65.16 t/ha, which is 24.88% higher than the standard variety, and the level of manifestation of the trait “Overall productivity per plant” – 3.20 kg/plant, which is 19.38% higher than the standard variety. The same line had a better indicator “BVGi” than the standard cultivar in the manifestation of the first trait (BVGi = 42.97) and in the manifestation of the second trait (BVGi = 2.18). Other linear samples, VL-91 (K-1994), VL-92 (K-2005) and LK 17-48 (K-2038), distinguished themselves by a high level of total yield (Xmed = 53.36...61.73 t/ha, which is 2.56–18.30% higher than the standard variety) and relatively high breeding values of the genotype (BVGi = 23.66...30.79 versus BVGi = 38.73 for the standard variety). Similarly, according to the trait “Total productivity of one plant”, the above lines had a level of Xmed = 2.61...3.02 kg/plant, which was at the level of the standard variety or higher by 17.05%. At the same time, the indicator of the breeding value of the genotype in them was also relatively high (BVGi = 1.18...1.53 versus BVGi = 1.81 for the standard variety). Conclusions. Analyzing courgette lines in terms of adaptive ability, it should be noted that the four best of them in terms of the level of manifestation of traits “Total yield” and “Total productivity of one plant” demonstrated a high dependence on growing conditions (bi > 1). A significant difference between the best courgette lines and the standard variety is that three of them (VL-90 (K-1986), VL-91 (K-1994), LK 17-48 (K-2038)) had a low dependence of manifestation on climatic conditions of growing signs "Average weight of marketable fruit" (bi = -0.23 ... 0.73). Therefore, it is these lines that are useful starting material for the creation of highly adaptive and highly productive varieties and hybrids of F1 courgette.

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Published
2021-01-11
How to Cite
Kondratenko, S., Sergienko, O., Samovol, O., & Lankaster, Y. (2021). ADAPTIVE POTENTIAL OF COURGETTE LINES OF FOREIGN ORIGIN BY THE COMPLEX OF TRAITS OF PRODUCTIVITY. Vegetable and Melon Growing, (68), 6-15. https://doi.org/10.32717/0131-0062-2020-68-6-15