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Pedicel length is a crucial agronomic trait of cucumbers. Fruit deformation can occur When the pedicel is too long or too short. Moreover, an appropriate pedicel length is advantageous for mechanized harvesting. Therefore, it is essential to investigate the molecular regulatory mechanisms underlying cucumber pedicel length. In the current study, we obtained a short pedicel mutant through EMS mutagenesis and discovered that the reduced cell number was the primary cause of the shortened pedicel. Upon analyzing the hormone content, we found that the level of trans zeatin in the long-pedicel material was significantly higher than that in the short-pedicel material. Further transcriptome sequencing analysis revealed that differentially expressed genes were enriched in cytokinin synthesis-related pathways. Based on these results, the present study concluded that cucumber pedicel length is regulated by genes related to the cytokinin synthesis pathway and that differences in length result from differences in zeatin content and cell number. [ABSTRACT FROM AUTHOR]

Both cucumber and melon are members of the Cucurbitaceae family and are important vegetable crops throughout the world. Among the most harmful oomycete species is downy mildew, which causes great damage to cucumber and melon production. An important basis for disease resistance molecular breeding is the study of genetic law and molecular regulation mechanism of cucumber and melon resistance to downy mildew. Pseudoperonospora cubensis is the pathogen responsible for downy mildew in cucumber and melon. Furthermore, there is a high degree of homology between the genomes of cucumber and melon. Cucumber and melon may therefore share a similar molecular genetic basis. This paper summarized and analyzed the physiological races differentiation of P. cubensis, the genetic law, and the mapping of resistance genes of cucumber and melon downy mildew resistance, to provide a reference for the comparative genomics research and the molecular design breeding of cucumber and melon downy mildew resistance. [ABSTRACT FROM AUTHOR]