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World of CitrusWorld of CitrusTexas Red Grapefruit
Eliezer S. Louzada and Chandrika Ramadugu · HortTechnology · 2021-05-05
https://journals.ashs.org/view/journals/horttech/31/3/article-p243.xml (opens in a new tab)
The paper identifies TR-1 as a spontaneous mutant of Rio Red found in Texas and reports that it was patented in 2020. Its mention of planting in 2022 is prospective, not confirmation that planting or release occurred.
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Nagendra Pratap Singh; Mamoudou Sétamou; Madhurababu Kunta; Venugopal Mendu · Scientific Reports (Nature Portfolio)
https://www.nature.com/articles/s41598-026-72986-x_reference.pdf (opens in a new tab)
Article in Press (DOI 10.1038/s41598-026-72986-x); no publication date supplied in the PDF. Table 1 gives the formal name Texas Red TR-1 and describes Rio Red → bud sport → TR-1; the Introduction reports a spontaneous Rio Red bud sport found at Weslaco in 2004 and patent USPP31702 in 2020. The study sequences young leaves from field-grown Rio Red, Ruby Red and Texas Red TR-1 and compares complete chloroplast genomes. The cultivar table’s color/naringin descriptions are comparative profile entries, not measurements from this sequencing study. No fruit sampling, sensory scoring, naringin assay, or HLB-resistance test is reported; chloroplast similarity does not establish nuclear parentage.
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Eliezer Silva Louzada; Hilda Sonia del Rio · United States Patent and Trademark Office · 2020-04-28
US Plant Patent US PP31,702 P3, issued 2020-04-28; application filed 2018-01-26. The patent identifies TR-1 as a Rio Red bud-sport mutation originating in Weslaco in 2004. Its botanical description is based on approximately seven-year-old Weslaco trees on C-22 and reports a 3.75 m tree, mean fruit mass 466.96 g, spherical-to-oblate shape, moderate-to-difficult peeling, 9.15 °Brix, and 2.75 seeds; fruit sample count and measurement protocol are not given. Printed axial and apical diameters are retained as printed and not reinterpreted as length/width. The patent marks the specimen sensitive to citrus greening and says other diseases/pests were not tested; no method is supplied. These are source-specific patent descriptors, not replicated trial outcomes.
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