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World of CitrusWorld of CitrusUFR-16
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-16 page: 46 × 31-02-13, described there as diploid sour-orange type; no yield data; low HLB rating; medium–large tree; medium–high confidence. 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%; seedling uniformity 10–49%; UFR-16 tree size intermediate/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/USPP27743P3/en (opens in a new tab)
Patent source for UFR-16 breeding background; it confirms a diploid sexual cross involving Hirado Buntan pummelo and Shekwasha mandarin. Parentage notation is retained as source-reported and is not inferred from ploidy alone.
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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-16 description reports a diploid Hirado Buntan pummelo × Shekwasha hybrid. The tested selection had 15–20 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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