Domateslerde (Lycopersicon esculentum L.) kırılma karakterinde genotipik ve çevre etkilerinin incelenmesi

This study investigated the stem breakage problem in tomato (Lycopersicon esculantum L.). Kinking (nicking) is the name given to the breaking of tomato stems. This problem causes tomato fruits to remain small and yield loss. The genetic, environmental and physical causes of the nicking problem affecting tomatoes were investigated. This study aims to minimize the damage by reducing the nicking problem. The frequency of occurrence of this problem in the hybrids in the gene pool, the frequency of its occurrence in the lines and the variability of the same lines in different environmental conditions were investigated. Phenotypic observations were taken in the trials conducted in the spring, autumn and winter seasons of 2019. A total of 3854 materials were analyzed including 3508 hybrids and 346 lines. Frequency analyzes showed that the frequency of the kinking character was very high. In these analyzes, it was observed that the frequency of the kinking character of the 2019 winter lines were lower than in other seasons. When all materials analyzed, a positive and significant relationship was found between kinking and truss stem length. At the same time, there was a negative but significant relationship with harvest difficulty character. No significant relationship was found between kinking and other traits. In addition, no comment could be made on the hereditary feature of the kinking character, and it is thought that the kinking character is affected by environmental factors such as temperature, light and humidity. Therefore, hybridisation programs are suggested using these materials and selections should be made for short and strong peduncles in breeding programs. GWAS studies and , QTL analyzes are recommended for a better understanding of the inheritance of this character.