Helianthus annuus L. (Sunflower) Transformation

We guarantee transformation of the inbred line Ha89, with delivery of at least 10 independent T0 events per construct. Customer-supplied cultivars and breeding lines can often be accommodated, but because sunflower transformation performance varies substantially by genotype, we first conduct a feasibility review of the material. If the cultivar is unproven in tissue culture, we recommend a small pilot study to assess callus induction, regeneration capacity, and marker sensitivity before full-scale work begins.

Sunflower exhibits genotype-dependent regeneration, relatively low stable transformation frequencies, and strong tissue responses to Agrobacterial infection that can damage explants during co-culture. Recovery of whole, non-chimeric plants also takes longer than in model species. Our protocols are specifically optimized around these constraints — controlled inoculum density, extended co-culture, genotype-matched hormones, and stringent selection — which is why a sunflower-specialized workflow outperforms generic crop protocols.

Sunflower's duplicated genome architecture means many genes have close paralogs. Complete functional knockout may require multiple sgRNAs, copy-specific guide design, and screening of enough independent events to recover plants with all targeted copies disrupted. We use amplicon sequencing and zygosity analysis to document the allelic state of each recovered line and report exactly which copies are edited, rather than assuming a single guide achieves full knockout.

Yes. Depending on project goals, we provide DNA-free editing using pre-assembled Cas protein–sgRNA complexes delivered without integrated transgenes, and we can advance edited lines through selfing so that the Cas9 cassette segregates away in the T1 or T2 generation. Both approaches yield edited plants with no foreign DNA in the final material, subject to the genotype's regeneration performance.

Each T0 plantlet is tracked to a physically separate explant or callus cluster, eliminating clonal duplicates from the same transformation event. Confirmation combines this documented origin with PCR genotyping and, on request, copy-number analysis to show distinct integration patterns across delivered lines — giving you true biological replicates for downstream analysis or breeding.

Yes. We offer generation advancement to T1 and T2, including segregation analysis, homozygous line fixation, and transgene-free plant recovery. Downstream options include expression analysis, copy-number verification, and preliminary phenotyping for oil-related metabolites or abiotic stress response, allowing you to receive material ready for field-trial or publication-stage work.

We routinely engineer complex binary vectors, including multiplex sgRNA arrays, stacked trait cassettes, and codon-optimized editing nucleases. For very large or repetitive constructs where Agrobacterium delivery efficiency may drop, we can evaluate alternative delivery such as particle bombardment. Feasibility is assessed during project design so the delivery strategy matches the construct.