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World of CitrusWorld of CitrusUFR-2
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-2 page: Orange 4; tetraploid; medium yield; low–medium HLB rating; potential salinity; medium tree; medium fruit quality. 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-2 tree size intermediate and freeze tolerance intermediate. 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/USPP27742P3/en (opens in a new tab)
Patent source for UFR-2 breeding background. The patent source describes UFR-2 as a sexual cross between the somatic-fusion parent [Nova + H.B. pummelo] and the somatic-fusion parent [Cleopatra + Argentine trifoliate orange]. Parentage notation is preserved as source-reported; no legal-status claim is recorded.
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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-2 description reports a tetraploid allotetraploid zygotic hybrid produced by crossing two prior somatic hybrids. Its tested Orange #4 selection had 20–30 seeds per fruit and was described as highly polyembryonic. These are selection-specific observations; no embryo-count denominator or zygotic rate is reported.
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