Cucumis sativus L. (Cucumber) Transformation

Diploid inbred lines and standard market types such as Chinese long cucumbers and certain European slicers generally exhibit the highest regeneration competence. However, transformation efficiency is highly genotype-dependent, and elite commercial varieties may display hormone insensitivity or low differentiation rates. For uncharacterized germplasm, we strongly recommend a pilot feasibility study to evaluate cotyledonary node responsiveness, antibiotic sensitivity, and callus induction before scaling to a full project.

We define an independent event as a positive T0 plantlet arising from a physically distinct explant or callus clump, verified by spatial documentation during selection. Multiple shoots regenerating from the same transformed cell cluster represent a single clonal event. Upon request, we perform junction-sequence analysis or insertion copy-number analysis to confirm that each delivered plant carries a unique genomic integration pattern, ensuring genuine biological replicates.

Standard delivery integrates a foreign DNA construct—such as an overexpression cassette or RNAi hairpin—into the cucumber genome, producing plants that inherit the transgene and selection marker. In contrast, our CRISPR knockout service generates targeted mutations, typically small insertions or deletions, at an endogenous locus. The advanced package emphasizes mutation screening via Sanger sequencing, zygosity analysis, and optional transgene-free segregation to remove the Cas9 cassette in subsequent generations.

Yes. We offer comprehensive generation advancement, cultivating T0 plantlets to floral maturity and performing controlled self-pollination to harvest T1 seeds. For CRISPR projects, the T1 generation allows segregation analysis to identify plants that have lost the T-DNA while retaining the desired mutation. We can further advance promising lines to T2 to achieve homozygosity, providing detailed genotyping reports and preliminary phenotypic observations under controlled greenhouse conditions.

Cucumber is notorious for genotype-dependent regeneration, low differentiation rates from some market classes, and the frequent occurrence of escape plants during antibiotic selection. Additionally, abnormal embryo development and poor rooting can limit recovery of fertile transformants. Our protocols mitigate these issues through cultivar-specific hormone optimization, stringent dual-selection strategies, and rigorous molecular verification to ensure that only genuinely edited or transgenic plants advance to the greenhouse.

Yes. We provide DNA-free editing methods using pre-assembled Cas9-sgRNA ribonucleoprotein complexes delivered via PEG-mediated protoplast transformation or biolistic bombardment. These approaches eliminate the risk of foreign DNA integration and reduce off-target effects, making them particularly attractive for regulatory-sensitive applications or for generating transgene-free edited lines that bypass lengthy segregation programs.

Every edited line undergoes PCR amplification across the target locus followed by Sanger sequencing to identify insertions, deletions, or substitutions. For multiplex projects, we offer amplicon sequencing to profile editing outcomes across all targeted sites. Zygosity is assessed by chromatogram decomposition or targeted deep sequencing, and off-target analysis can be performed via in silico prediction coupled with experimental validation at predicted sites.