Özet:

The interaction created by the various candidates developed as a result of the Islah programs with different environmental conditions is an important criterion to demonstrate the actual performance of genotypes. The genotype x environmental interaction can determine which genotypes are better adapted to the unsuitable environmental conditions or which genotypes are more stable in all locations. In this study, the Black Sea Region castan grapes (Cucurbita maxima Duch.)  There is hope to be developed through the selection of the populations of local castan grapes (55CA15, 55CA06 and 57SII21) in the ecological conditions of Samsun in three different locations (Bafra, Tekkeköy and Salıpazarı) some fruit quality characteristics and performance elements are aimed at determining. In the study, in terms of fruit size and fruit shell thickness values, there were significant differences between both the genotypes and locations of the castan shell. In terms of the colour of the fruit and the water-soluble dry substance (SCM) values, there was no statistically significant difference. When compared with the productivity values of cabbage varieties, 57SI21 (2.1 t to-1) was ranked first. This genotype was followed by 55CA15 (1.7 t to 1) and 55BA03 (1.7 t to 1) . In terms of the average fruit weight; the regression rate is below 1, the regression stability is positive, the Sd2 value is close to 0 and the r2 value is 0.86, the 57SI21 genotype is more stable than other genotypes. Similarly, in terms of the hardness of fruit meat, the 57SI21 genotype is more stable than the Arıcan-97 species. According to the research, the 57SI21 genotype, which is more stable in fruit weight and fat strength characteristics, has been found to be the most suitable genotype for the ecological conditions of Samsun. In the upcoming period, the work will be started to receive the standard seed registration (register) of the specified species. Therefore, a new variety of castan grapes will be produced for our country.

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