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George L. Staby, Richard M. Basel, Michael S. Reid, and Linda L. Dodge

Three commercially available “anti-ethylene” treatment solutions were tested for their effectiveness in protecting carnations (Dianthus caryophyllus L. `Improved White Sim', `Atlantis', and `Nora'), Beard-Tongue (Penstemon hartwegii x P. cobaea `Firebird'), and Delphinium sp. from external ethylene levels ranging from 0.01 to 1.2 ppm. Flowers were treated according to label directions and then exposed to ethylene for 20 or 24 h at 20 to 23C after a 0-, 24-, or 48-h delay. Only the product containing silver thiosulfate (STS) provided protection against ethylene injury, whereas products containing inhibitors of ethylene synthesis identified as analogs of either aminooxyacetic acid (AOA) or aminoethoxyvinyl glycine (AVG) offered little or no protection. The safe commercial use of products containing STS is discussed.

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Dale T. Lindgren and Daniel M. Schaaf

hybrids. Penstemon cobaea has also been reported to be a successful parent in the European hybrids ( Way and James, 1998 ). Hybridization in the genus Penstemon is complex. Success can be based on the number of successful crosses and seed produced

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Dale T. Lindgren and Daniel M. Schaaf

cobaea Nutt. × Penstemon triflorus A. Heller) ( Lindgren, 1993 ). Three selections were made in 1997 out of the resultant population of seedlings, DM1, DM2, and DM3. All three selections displayed darker fall foliage color than the parent ‘Husker Red

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Dale T. Lindgren, Daniel M. Schaaf, and Kim Todd

Penstemon Mitch. (Plantaginaceae Juss. formerly Scrophulariaceae Juss.) is a diverse genus of ≈271 species that occur throughout the United States (except Hawaii), Canada, Mexico, and Guatemala ( Lindgren and Wilde, 2003 ). Many cultivars have been

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Alicain S. Carlson and John M. Dole

ethylene (0.2 or 1 ppm) to foxglove beardtongue decreased its vase life, but treatment with STS had no effect ( Redman et al., 2002 ). Serek et al. (1995) found that the longevity of ‘Firebird’ penstemon ( P. hartwegii × P. cobaea ‘Firebird’) increased