Application of low intensity light pulses to delay postharvest senescence of Ocimum basilicum leaves |
| |
| Institution: | 1. Instituto de Fisiología Vegetal (INFIVE), CONICET-UNLP, cc 327, 1900 La Plata, Argentina;2. Análisis Químico, Facultad de Ciencias Agrarias y Forestales-UNLP, calle 60 y 119, La Plata, Argentina;1. Department of Biological and Environmental Sciences, Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga, Shizuoka 422-8529, Japan;2. Department of Citrus Research, National Institute of Fruit Tree Science, Kuchinotsu, Nagasaki 859-2501, Japan;3. The United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan;4. Stanley Electric Co., Ltd. Research & Development Center, 1-3-1 Edanishi, Aoba, Yokohama, Kanagawa 225-0014, Japan;5. Stanley Electric Co., Ltd. Yokohama Technical Center, 2-14-1 Edanishi, Aoba, Yokohama, Kanagawa 225-0014, Japan;1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China;2. Department of Food Science and Engineering, Ningbo University, Ningbo 315211, Zhejiang, PR China;1. Shikoku Research Institute Inc., Takamatsu 761-0113, Japan;2. Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan;3. Graduate School of Biosphere Sciences, Hiroshima University, Higashi Hiroshima 739-8521, Japan;1. Institute of Food Science, National Council of Research, Via Roma, 64, 83100 Avellino, Italy;2. Institute of Sciences of Food Production, National Council of Research, Via G. Amendola, 122/O, 70126 Bari, Italy;3. DIAAA, University of Molise, Via de Sanctis snc, 86100 Campobasso, Italy |
| |
| Abstract: | Fresh basil (Ocimum basilicum L.) is a highly perishable leafy green vegetable with a storage life of 4–5 d at room temperature. Exposure of basil leaves to temperatures below 12 °C during storage results in chilling injury; therefore, refrigeration cannot be used to extend postharvest life of basil. Typically, leafy vegetables are stored in darkness or extremely low irradiance. Darkness is known to induce senescence, and the initial phase of senescence is reversible by exposure to light. In this work, we studied the effects of low-intensity white light pulses at room temperature on postharvest senescence of basil leaves. Daily exposure for 2 h to 30–37 μmol m?2 s?1 of light was effective to delay postharvest senescence of basil leaves. Chlorophyll and protein levels decreased, ammonium accumulated and leaves developed visual symptoms of deterioration (darkening) during storage in darkness. Light pulses reduced the intensity of these senescence symptoms. The photosynthesis light compensation point of basil leaves was 50 μmol m?2 s?1 i.e., higher than the intensity used in this study, and the effect of treatment with red light was the same as with white light, while far red light was ineffective. Light pulses exerted a local effect on chlorophyll loss, but the effect on protein degradation was systemic (i.e., spreading beyond the illuminated parts of the leaf blade). The results of this study indicate that daily treatment for 2 h with low intensity light (30–37 μmol m?2 s?1 every day) during storage at 20 °C is an effective treatment to delay postharvest senescence of basil leaves. The delay of postharvest senescence by low intensity light pulses seems to be mediated by phytochromes, and it is systemic for protein, and partially systemic for chlorophyll degradation. |
| |
| Keywords: | Postharvest senescence Low intensity light pulses Red light Ammonium accumulation |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
