Benzyl-aminopurine (BAP) treatments delay cell wall degradation and softening,improving quality maintenance of refrigerated summer squash |
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| Institution: | 1. Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CCT La Plata, CONICET – Facultad de Ciencias Exactas-UNLP), Calle 47 Esq. 116, La Plata CP 1900, Argentina;2. Comisión de Investigaciones Científicas Pcia. de Buenos Aires CIC-PBA, Argentina;3. LIPA: Laboratorio de Investigación en Productos Agroindustriales, Facultad de Ciencias Agrarias y Forestales Universidad Nacional de La Plata, Calle 60 y 119, La Plata CP 1900, Argentina;1. Horticultural Sciences Department, IFAS, University of Florida, Gainesville, FL 32611-0690, USA;2. College of Horticulture, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China;3. Department of Horticulture, Cornell University, Ithaca, NY 14853-0001, USA;1. Young Researchers and Elite Club, Ahar Branch, Islamic Azad University, Ahar, Iran;2. Department of Horticultural Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran;3. Department of Biology, Faculty of Sciences, University of Qom, Qom, Iran;4. Department of Agricultural Biotechnology, Imam Khomeini International University, Qazvin, Iran;1. Department of Horticulture, Shahed University, Tehran, Iran;2. Departamento de Postcosecha, Instituto Valenciano de Investigaciones Agrarias, Moncada, Valencia, Spain;3. Department of Horticultural Science, College of Agriculture and Natural Resources, University of Tehran, Tehran, Iran;1. Key Laboratory of Urban Agriculture (North), Ministry of Agriculture/Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture/Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture/Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, National Engineering Research Center for Vegetables, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, P.R.China;2. College of Food Science and Technology, Yangzhou University, Yangzhou 225127, P.R.China;1. College of Food Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi China;2. Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits &Vegetables, Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits & Vegetables, College of Agronomy, Jiangxi Agricultural University Nanchang, Jiangxi China;3. College of Materials and Chemical Engineering, Pingxiang University, Pingxiang, Jiangxi China;4. College of Chemistry and Material Science, Shandong Agricultural University, Taian China |
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| Abstract: | Round summer squash are harvested before reaching full maturity and even though they are highly perishable, fruit postharvest handling is mostly based on storage at non-chilling temperatures. Finding complementary treatments minimizing deterioration and reducing postharvest losses would be extremely useful. In this work we evaluated the effect of postharvest cytokinin (CK) treatments on refrigerated round soft rind squash. Fruit were harvested at commercial maturity and sprayed with 1 mmol L−1 benzylaminopurine (BAP) or water (control) prior to storage at 5 °C for 0, 13 or 25 days. Quality was assessed upon removal from cold storage as well as after a 2 day shelf-life period at 20 °C. CK-treated fruit showed slower deterioration and dehydration and remained firmer than the control. BAP sprays did not affect color, respiration or sugar-acid balance. The treatments prevented phenolic compound accumulation, and decreased pectin solubilization. By the end of the storage period BAP-treated squash had higher levels (45%) of tightly-bound polyuronides than untreated controls, indicating a substantial delay in cell wall dismantling. CK sprays also reduced neutral sugar solubilization from pectin-rich fractions, but no changes were found in the cross-linking glycans or cellulose. To our knowledge, this is the first work showing that CK can regulate pectin disassembly in developing fruit. Postharvest BAP sprays preventing texture deterioration may be a simple treatment to complement refrigeration of round, soft rind, summer squash. |
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| Keywords: | Cucurbits Cell wall Texture Firmness Pectin |
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