GA4+7 plus BA enhances postproduction quality in pot tulips |
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| Authors: | Hye-Ji Kim William B Miller |
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| Institution: | 1. Seed Science Center, Iowa State University, Ames, IA 50011, USA;2. Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA;3. Molecular and Computational Biology, University of Southern California, Los Angeles, CA 90033, USA;4. Sydney Emerging Infections & Biosecurity Institute, School of Biological Sciences and Sydney Medical School, The University of Sydney, Sydney, NSW 2006, Australia;1. Department of Pathology, Albert Einstein College of Medicine, NY, USA;2. Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, NY, USA;3. Department of Physiology, Presidency University, Kolkata, India;4. Department of Genetics, Albert Einstein College of Medicine, NY, USA;5. Program in Health Sciences, Infectious Diseases and Tropical Medicine/Interdisciplinary, Laboratory of Medical Investigation, Faculty of Medicine, and the Department of Biochemistry and Immunology, Institute of Biological Science, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil;6. Division of Perinatal Research, Kolling Institute of Medical Research, Royal North Shore Hospital, St. Leonards, N.S.W., Australia;7. Department of Medicine, Albert Einstein College of Medicine, NY, USA;1. Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan;2. Kyoto Biken Laboratories, Inc., Uji 611-0041, Japan;3. Faculty of Agriculture, Utsunomiya University, Utsunomiya 321-8505, Japan |
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| Abstract: | Previously we reported that postproduction quality of pot ‘Seadov’ tulip (Tulipa gesneriana) was significantly increased by GA4+7 plus BA in a manner dependent on the concentration and stage of flower development at application. In these experiments, we extended the survey to 20 tulip cultivars to further evaluate the effects of GA4+7 plus BA sprays for enhancing postproduction flower and leaf quality. The senescence symptom of the cultivars fell into three categories: wilting, wilting-abscission (abscission shortly after tepal wilting) and abscission (abscission without wilting), with the majority of the cultivars belonging to the wilting and wilting-abscission categories. Pots bearing six plants were sprayed with a range of GA4+7 plus BA concentrations at marketable stage and placed in a simulated consumer environment (SCE). GA4+7 plus BA significantly enhanced individual flower and postproduction longevity, but the effect was dependent upon the senescence category of the cultivar. In general, GA4+7 plus BA increased individual flower and postproduction longevity of wilting-type cultivars at concentrations above 10 mg L?1, while longevity of wilting-abscission-type cultivars was only enhanced by 50 mg L?1. Abscission-type cultivars were not affected by any concentrations of GA4+7 plus BA. Regardless of floral senescence category, leaf yellowing was significantly reduced by GA4+7 plus BA sprays in those cultivars showing postproduction leaf yellowing. GA4+7 plus BA did not induce leaf and stem elongation in most cultivars. Only ‘Yellow Baby’, the shortest cultivar, showed elongation of stem and leaf by GA4+7 plus BA at concentrations above 25 mg L?1. Spray applications of GA4+7 plus BA can be useful to enhance flower and leaf quality in pot tulips. |
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