Postharvest treatments to reduce chilling injury symptoms in stored ...

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solve this problem but still this field requires more research and development activities leading to appropriate treatment through which shelf life of mango fruit can be increased. Careful handling minimizes mechanical injuries and currently available technology like low temperature storage, CA and hypobaric storage can improve the shelf life for about 2 to 4 weeks. Postharvest heat-treatments provide protection from pests, insects and other diseases to some extent, but microbial control must be considered and treatment against pathogenic organisms need further research. More research is required in the storage and ripening field as CI is also a major storage problem and it is still uncertain as to at what temperature CI will occur in different cultivars and what factors are involved? Further work with several mango cultivars by using different heat-treatments and chemicals at different concentrations need to be found for commercial use. 27
III. POSTHARVEST TREATMENTS TO REDUCE CHILLING INJURY SYMPTOMS IN MANGOES cv. KENT 3.1 Abstract This study aims at comparing the ability of postharvest treatments in reducing the incidence of chilling injuries on mangoes. Mangoes (Mangifera indica L.), like many tropical and subtropical fruits, are prone to chilling injuries when stored below 12 ºC. The most frequent visual chilling injury (CI) symptoms of mango fruits are dark, scald-like discoloration and pitting on the skin. These symptoms affect the market value of the fruits and increase post harvest losses. Hot wa ter (HW), methyl jasmonate (MJ) and diphenylamine (DPA), are three post harvest treatments known to reduce CI symptoms. The mangoes used for the experiment were grown in Ecuador, South America, and shipped by containers to Montreal (QC, Canada). At their arrival, mangoes were divided into four lots that were either HW-treated (50 ± 2 ºC) for 10 min, dipped in a 10 -4 M solution of MJ for 2 min, or dipped in 12 mM solution of DPA for 2-3 min, or left untreated (control). Then, each lot was subdivided into groups and stored at either: 1, 4, 7 or 10 ºC for 21 days. Best results were obtained with the MJ and DPA CI- treatments with the percentage of marketable fruits being significantly greater than those under the control CI-treatment. With more than 50 % of marketable fruits, best storage conditions for mangoes cv. Kent was obtained with the following factorial combinations: MJ at 1 and 7 ºC, and with DPA at 4 and 7 ºC. This experiment demonstrates that both growth hormones (MJ) and antioxidant (DPA) postharvest treatments have the potential of improving tolerance to cold of mango fruits cv. Kent thereby reducing the incidence of CI symptoms. This would eventually allow storage of mangoes at temperatures below 10 ºC, which would increase the potential storage life of the fruits. 3.2 Introduction Mango, (M. indica L.), is grown throughout the subtropical and tropical regions and it is one of the world’s most important fruit crops. Most mango fruits are consumed fresh and they are good sources of vitamin A and C. Mangoes are climacteric fruits that 28
Page 1 and 2: Postharvest treatments to reduce ch
Page 3 and 4: RÉSUMÉ Traitements post-récolte
Page 5 and 6: FORMAT OF THESIS This thesis is wri
Page 7 and 8: CONTRIBUTION OF AUTHORS The reporte
Page 9 and 10: 2.1.2 Pests and diseases………
Page 11 and 12: 4.4.1 Procedure………………
Page 13 and 14: c) Treatment with ethylene………
Page 15 and 16: LIST OF FIGURES Figure 2.1: Tear sh
Page 17 and 18: MCP 1-methylcyclopropene Min Minute
Page 19 and 20: many international traders are faci
Page 21 and 22: II. LITERATURE REVIEW Mango (Mangif
Page 23 and 24: 2.1.2 Pests and diseases Ma ngo is
Page 25 and 26: harvesting of fruits. Useful chemic
Page 27 and 28: maintain the quality of the product
Page 29 and 30: maintains O2 and relative humidity.
Page 31 and 32: friendly; so the interest in heat d
Page 33 and 34: ecomes soft due to heat-treatment.
Page 35 and 36: like discoloration of the skin, ski
Page 37 and 38: egulates these attributes is not ye
Page 39 and 40: harmful volatiles (Whitaker, 2000).
Page 41 and 42: 2.7 Quality Evaluation Product qual
Page 43: Ripe mango shows a wide range of co
Page 47 and 48: the firmness of fruits such as plum
Page 49 and 50: pH of the flesh was measured using
Page 51 and 52: (b) pH, total soluble solids and te
Page 53 and 54: substantiated the work of McGuire,
Page 55 and 56: Fornaris-Rullan, G.R., Guadalupe-Lu
Page 57 and 58: Table 3.1. Description of the exper
Page 59 and 60: Table 3.5. Quality of mangoes cv. K
Page 61 and 62: CONNECTING TEXT Experiments were co
Page 63 and 64: exposure. CI symptoms include scald
Page 65 and 66: value) and yellow (greater b* value
Page 67 and 68: 4.8 Acknowledgement The authors are
Page 69 and 70: Table 4.2: Quality of cv. Kent mang
Page 71 and 72: CONNECTING TEXT In Chapters III and
Page 73 and 74: 5.2 Introduction Mango (M. indica L
Page 75 and 76: treatment (CI-1). The second lot (C
Page 77 and 78: period was characterized by further
Page 79 and 80: Incidence of CI symptoms After 18 d
Page 81 and 82: measurements made on the flesh port
Page 83 and 84: 5.9 References: Abou-Aziz, A.B., S.
Page 85 and 86: Table 5.1. Description of the exper
Page 87 and 88: Table 5.4. Quality of the mangoes c
Page 89 and 90: Table 5.6. Quality of the CI-3 (DPA
Page 91 and 92: CONNECTING TEXT In the previous cha
Page 93 and 94: flavor development and softening of
Page 95 and 96:
fruit. It is also called chorethiph
Page 97 and 98:
products that do not increase ethyl
Page 99 and 100:
welding purposes. Usually calcium c
Page 101 and 102:
of these ways have good skin color
Page 103 and 104:
6.8 References Akamine, E.K. and T.
Page 105 and 106:
Pal. R. K. 1998b. Ripening and Rheo
Page 107 and 108:
CI symptoms of mangoes cv. Kent and
Page 109 and 110:
Borrud, L., C. W. Enns; and S. Mick
Page 111 and 112:
Fornaris-Rullan, G.R., Guadalupe-Lu
Page 113 and 114:
Joel, D.M. 1978. The secretory duct
Page 115 and 116:
Mann S. S. 1974. Effect of ethylene
Page 117 and 118:
Pantastico, Er. B., T.K. Chattopadh
Page 119 and 120:
Seymour, G. 1984. Report on a visit
Page 121 and 122:
Wardlaw C W. 1961. Banana disease i
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