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Harvey J. Lang, Claire-Lise Rosenfield, and David Wm. Reed

Ficus benjamina L. and Dracaena marginata Lam. were grown in a modified Hoagland's nutrient solution containing either 0, 0.22 or 5.52 mg Fe3+/liter (HEEDTA or EDTA). F. benjamina grew well at all Fe levels and showed mild chlorosis only at 0 mg Fe/liter. For D. marginata, growth decreased and chlorosis increased as solution Fe level decreased. F. benjamina exhibited a high capacity for Fe3+ reduction, which increased as Fe level decreased, reaching a maximum below 0.06 mg·liter-1 D. marginata exhibited a low capacity for Fe3+ reduction, which was slightly enhanced at 0.1 to 0.15 mg·liter-1. In both species, reduction occurred in the presence of roots, with minimal reduction in their absence. This result indicates that Fe3+ is reduced at the root surface and not by reductants released into the solution. F. benjamina increasingly lowered pH as solution Fe decreased, and always lowered pH more than D. marginata at all Fe levels. Total and extractable Fe concentration of leaves did not correlate well with chlorosis, whereas total Fe content per plant correlated highly with chlorosis. Chemical names used: N-hydroxyethyl-ethylenediamine-triacetic acid (HEEDTA), ethylenediamine tetraacetic acid (EDTA).

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Kalpana Sharma, Erica Goss, and Ariena H.C. van Bruggen

complex. Host range experiment. One variety of Hawaiian Ti ‘Tipsy Pink’ obtained from Agri-Starts, Inc., Apopka, FL; three varieties of Dracaena marginata var. ‘Tarzan’, ‘Magenta’, and ‘Colorama’ and one variety of lucky bamboo ( D. sanderiana ) obtained

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Andrew J. Macnish, Ria T. Leonard, and Terril A. Nell

’, Dracaena marginata ‘Bicolor’ and ‘Magenta’, Euphorbia splendens ‘Short and Sweet’, Spathiphyllum ‘Ty's Pride’). Ethylene treatment also accelerated senescence (i.e., browning) of the spadix and the surrounding spathe on Anthurium scherzerianum ‘Red

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Trent Y. Hata, Arnold H. Hara, Mike A. Nagao, and Benjamin K.S. Hu

Frangipani (Plumeria hybrid `Donald Angus') cuttings immersed in hot water (49C for 10 min) followed by 0.8% indole-3-butyric acid (IBA) basal treatment (hot water + IBA) had greater root length and weight compared to the nontreated control, hot water, or IBA treatment alone. Greater percentage of rooting and number of roots per cutting were observed for hot-water-treated + IBA-treated cuttings compared to the non-treated control and hot-water treatment alone. In a second study, Dracaena fragrans (L.) Ker-Gawl. `Massangeana', D. deremensis Engl. `Warneckii', D. deremensis Engl. `Janet Craig', D. marginata Lam., and cape jasmine (Gardenia jasminoides Ellis) cuttings displayed results similar to those observed with Plumeria cuttings. In addition to enhancing rooting, hot water + IBA also stimulated the number of shoots per cutting on anthurium (Anthurium andraeanum Andre `Marian Seefurth'), croton [Codiaeum variegatum (L.) Blume var. pictum (Lodd.) Mull. Arg.], D. marginata, D. fragrans, Plumeria, and ti (Cordyline terminalis `Ti') cuttings.

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Kent D. Kobayashi, Andrew F. Kawabata, and Joanne S Lichty

Photoselective shadecloths that manipulate light quality may enable nursery growers to achieve desired plant growth. This ability to manage plant habit could give growers an additional nonchemical tool to improve potted plant quality. The objective of this study was to determine growth and flowering responses of potted Dracaena and Anthurium plants to four shadecloths. Dracaena deremensis `Janet Craig' and Dracaena marginata `Colorama' cane top-cuttings were placed in 70% black cinder: 30% peat moss media. Anthurium `Lola' liners were transplanted into 100% black cinder medium. Plants were grown in a greenhouse under 70% shadecloths: black, gray, red, and blue. Four months after planting, Dracaena `Janet Craig' had more new leaves under red shadecloth (10.4) compared to other shadecloths (8.9–9.3). Leaf area was less with red shadecloth (340 cm2) than other treatments (380-388 cm2). Plants under the red shadecloth had the lowest grower evaluation scores (5.4; 1 = poor, 10 = excellent) than those under other shadecloths (7.2–8.2), but all plants were considered marketable. Dracaena `Colorama' plants under red shadecloth had the greater plant height increase (20.1 cm) than those under other shadecloths (10.1–13.2 cm). Red shadecloth resulted in more new leaves (26.2) compared to other treatments (18.0–21.4). Anthurium `Lola' flower height 9 months after transplanting was less under red shadecloth (23.0 cm) than under black (33.0 cm). The number of flowers/pot was greater under red shadecloth (3.17) compared to those under other shadecloths (0.50–1.33). Flower size was greater (35.2 cm2) under red shadecloth than under black (20.0 cm2). Photoselective shadecloths may be used to nonchemically manipulate plant growth and improve the quality of potted Dracaena and Anthurium plants.

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Alicia Rihn, Hayk Khachatryan, Benjamin Campbell, Charles Hall, and Bridget Behe

using organic production methods but not certified”), and conventional. Origin included Fresh from Florida (in-state), grown in the United States (domestic), and grown outside the United States (imported). Dragon tree ( D. marginata Lam.), peace lily

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Yaser Hassan Dewir, Abdulhakim A. Aldubai, Rashid Sultan Al-Obeed, Salah El-Hendawy, Mayada Kadri Seliem, and Khadija Rabeh Al-Harbi

; Vinterhalter and Vinterhalter, 1997 ), D. sanderiana ( Aslam et al., 2013 ; Beura et al., 2007 ), and D. marginata ( Chua et al., 1981 ; El-Sawy et al., 2000 ). However, propagation of ornamental Dracaena sp., still relies on imported cuttings as a

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Juanxu Liu, Min Deng, Richard J. Henny, Jianjun Chen, and Jiahua Xie

408 414 Chua, B.U. Kunisaki, J.T. Sagawa, Y. 1981 In vitro propagation of Dracaena marginata ‘Tricolor’ HortScience 16 494 Cui, J. Liu, J. Deng, M. Chen, J

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Svoboda V. Pennisi and Marc W. van Iersel

June 2010, to accommodate the number of species and cultivars used. Consecutive shipments of finished plant material ( Spathiphyllum ‘Sweet Chico’ Aglaonema spp., Sanseveria trifasciata ‘Hahnii’, Chamaedorea elegans , Dracaena marginata

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Kalpana Sharma, Joyce L. Merritt, Aaron Palmateer, Erica Goss, Matthew Smith, Tim Schubert, Robert S. Johnson, and Ariena H.C. van Bruggen

. dracaenophilum were downloaded from GenBank for comparison across the entire region. Host range experiment. Three varieties of Dracaena marginata var. ‘Tarzan’, ‘Magenta’, and ‘Colorama’, and one variety of lucky bamboo obtained from Delray Plants Co., Venus