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World of CitrusWorld of CitrusUFR-15
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-15 page: experimental 46 × 20-04-37, described there as diploid sour-orange type; no yield data; low HLB rating; large tree; medium–high confidence. The same report caption calls a Valquarius/SF14W-62 grafted plant a “tetrazyg rootstock,” so ploidy terminology is source-specific and unresolved.
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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%; seedling uniformity 10–49%; UFR-15 tree size large and freeze tolerance unknown. 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/USPP27275P3/en (opens in a new tab)
Patent text identifies UFR-15 as a diploid progeny of a Hirado Buntan PINK pummelo seed parent × Cleopatra mandarin pollen parent. This is a source-specific breeding statement; it is recorded alongside, not merged with, the FFSP 2014 report's conflicting “tetrazyg rootstock” caption.
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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-15 description reports a diploid Hirado Buntan pummelo × Cleopatra mandarin hybrid. The tested 46-20-04-37 selection had 20–23 seeds per fruit and was described as partially polyembryonic; the description says seedling trees need careful roguing to remove zygotics. No zygotic fraction or embryo-count denominator is reported.
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