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World of CitrusWorld of CitrusUFR-17
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-17 page: Green #2; tetrazyg; medium yield; low HLB rating; small–medium tree; medium–high confidence; 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-17 tree size small/intermediate and freeze tolerance good. This guide entry is a source-specific selection aid, not an immunity claim.
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Justia Patents
https://patents.justia.com/patent/PP28091 (opens in a new tab)
PP28091 describes UFR-17 (Green #2) as an allotetraploid zygotic hybrid produced by a sexual cross between two somatic-hybrid parents previously created by protoplast fusion: [Nova mandarin hybrid + Hirado Buntan pummelo zygotic seedling] and [sour orange + Carrizo citrange]. The plus signs denote the somatic-fusion parents; they are not separate sexual crosses. FFSP's tetrazyg designation is retained as source terminology, without treating it as a contradiction of tetraploidy. No current patent 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-17 description reports a tetraploid allotetraploid zygotic hybrid made from two prior somatic hybrids. The tested Green #2 selection had 18–26 seeds per fruit and was described as mostly polyembryonic. These are cultivar-description observations; no embryo-count denominator or zygotic rate is reported.
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