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World of CitrusWorld of CitrusUFR-6
FFSP · 2014-05
https://www.ffsp.net/wp-content/uploads/2014/05/Citrus-Rootstock-Overview.pdf (opens in a new tab)
FFSP 2014 rootstock overview, UFR-6 page: Changsha mandarin + 50-7 trifoliate-orange somatic fusion; tetraploid; high yield; medium HLB rating; small–medium tree; high fruit quality; cold hardy. Ratings are source-specific, not immunity claims; comparative data were limited.
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UF/IFAS Extension
https://ask.ifas.ufl.edu/publication/HS1260 (opens in a new tab)
UF/IFAS HS1260 5th-edition rootstock table: first commercial availability 2015; germination 80–90%; UFR-6 tree size small and freeze tolerance good. This guide entry is a source-specific selection aid, not an immunity claim.
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United States plant patent · Google Patents
https://patents.google.com/patent/USPP27276P3/en (opens in a new tab)
Patent source for UFR-6 breeding background. The patent source describes an allotetraploid somatic fusion of Changsha mandarin embryogenic suspension-culture cells + trifoliate orange 50-7 leaf protoplasts. The plus sign denotes the somatic-fusion construction; this is not recorded as a sexual seed × pollen cross.
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Ksenija Gasic; John E. Preece; David Karp · HortScience · 2020
https://doi.org/10.21273/HORTSCI50register-20 (opens in a new tab)
The UFR-6 description reports a tetraploid somatic hybrid produced by protoplast fusion between Changsha mandarin embryogenic suspension cells and a 50-7 trifoliate orange leaf parent. It had 30–37 seeds per fruit and was described as highly polyembryonic. These are cultivar-description observations; no embryo-count denominator or zygotic rate is reported.
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