Hordeum vulgare (Barley) Transformation

We maintain validated protocols for Golden Promise and Morex and can evaluate additional cultivars upon request. Because regeneration competence varies substantially between genotypes, cultivars without an established track record enter a feasibility assessment — typically including germination testing, callus induction trials, and selection sensitivity checks — before we commit to a full project. This protects you from paying for a transformation campaign on material that may not yet respond to published conditions. If you plan to edit an elite breeding line, please share its identity and any available tissue-culture history at the inquiry stage so we can scope the evaluation correctly.

Immature embryos at roughly ten to fourteen days after pollination provide scutellar tissue with the strongest embryogenic response in barley. This means donor plants must be grown and staged under controlled conditions, which is one reason stable barley transformation is measured in months rather than weeks. We operate donor plant production year-round to avoid seasonal delays, but clients should still budget for donor plant growth time within the overall timeline. Mature embryos or alternative explants can be explored for specific genotypes, though regeneration frequencies are generally less favorable and may affect the quoted event yield.

Candidate T0 plants are screened by PCR amplification across the target site, followed by sequencing of the amplicon to identify insertions or deletions. Each mutation is annotated by type (in-frame or frameshift) and classified by zygosity where the sequence data permit — homozygous, bi-allelic, or chimeric. Because early-generation barley plants can be mosaic, we treat chimeric candidates conservatively and prioritize clearly resolved alleles for advancement. Where copy-number or integration context matters, we can add Southern-based analysis through our molecular characterization workflows before lines move to T1.

We define success criteria in the project agreement before work begins, including the minimum number of independent events. If a construct fails to produce events in Golden Promise under our standard conditions, we first troubleshoot delivery and construct factors — guide efficiency, cassette design, or selectable marker compatibility — and discuss options with you before any rework is billed. For customer cultivars, feasibility results may indicate that the genotype itself limits recovery; in that case we report the data transparently and propose alternatives, such as switching the editing background to a reference genotype followed by introgression, rather than repeating an unpromising cycle.

Yes, as optional generation-advancement services. Selected T0 plants are grown to flowering and self-pollinated under bagging, and T1 progeny are genotyped to identify individuals homozygous for the desired edit. Because the CRISPR cassette is typically delivered on a T-DNA, segregation in T1 also makes it possible to identify plants that retain the target mutation but have lost the transgene — the transgene-free outcome many regulated-market or publication-driven projects require. Achieving this adds one generation to the timeline, which we factor into the proposal from the start.

Multiplex editing is supported through constructs carrying multiple guide RNAs, which we design with attention to guide spacing and construct stability. This approach is particularly useful for gene families and duplicated loci common in the barley genome, where single-guide knockout would leave functional paralogs. Multiplex projects receive expanded amplicon-based screening across all target sites, and we report allele combinations per event so you can select the genotype that matches your hypothesis. Multiplex designs may carry somewhat lower per-site efficiency, which we discuss candidly during construct design.

At minimum, we need the cultivar identity and approximately 200 healthy mature seeds for donor plant production — or pre-approved immature embryo donor plants for time-critical work. For the genetic material itself, you may supply a completed binary vector or commission our vector design service; either way, we require the full construct map including promoter, selectable marker, and terminator elements. For editing projects, please provide the target gene identifier or sequence and any allele-specific information. All materials and information supplied are handled under our standard confidentiality terms.