The Showdown variety is included in breeding catalogs and lists of vegetable varieties intended for professional cultivation. In scientific literature, the variety is mentioned in the context of breeding work on the introgression of genetic traits (QTLs) responsible for antioxidant properties into commercial lettuce lines.
This variety is also mentioned in phytosanitary reports as part of lettuce mosaic virus monitoring. A detailed agronomic description of the variety, including morphometric indicators and specific disease resistance scores, is not publicly available.
Sources4
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Countries of admission
1 jurisdiction
Green indicates countries where the variety is listed in the national catalogue and its seeds are authorized for sale. Expired registrations are marked separately: the variety was previously admitted, but sale is no longer permitted.
Variety registered as early as 1
jurisdiction,
data for which we do not publish: their registry licenses have not yet been verified. This section will be available upon verification.
Variety in registries
Regions of admission, rights holders, and status of plant breeders' rights
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This is a directory, not an official registry: data is based on public disclosures and may have changed.
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