Improving quality and shelf life of mangosteen (Garcinia mangostana L.)
| dc.contributor.advisor | Sarah, George T | |
| dc.contributor.author | Ance, Mathew | |
| dc.contributor.author | KAU | |
| dc.date.accessioned | 2017-08-05T10:02:33Z | |
| dc.date.available | 2017-08-05T10:02:33Z | |
| dc.date.issued | 2013 | |
| dc.description.abstract | Mangosteen (Garcinia mangostana L.) is a unique tropical fruit rich in vitamins and minerals. It is gaining demand in international markets mainly due to its much acclaimed health benefits such as antioxidant properties and prophylactic action on many of degenerative diseases. Major problems limiting profitable mangosteen production is the occurrence of translucent flesh disorder (TFD), gamboge disorder (GD) and short shelf life. Therefore an attempt was made to improve fruit quality and reduce flesh disorders through foliar nutrition at 4th, 8th and 12th week after bloom. Foliar application of CaCl2 (1 and 2%) alone, combinations of CaCl2 2% and boron (0.1% and 0.2%) and KH2PO4 0.5% gave high fruit retention of 75-88 per cent. Days to maturity was reduced to 84-85 days by KH2PO4 0.5% and KNO3 2%. Gamboge and translucent flesh disorders were significantly reduced by CaCl2 (1 and 2%) alone and combination of CaCl2 2% with boron (0.1 and 0.2%). Incidence of physiological disorders was minimum in the inner canopy (34-40%) compared to the outer canopy (56-66%) in all treatments. Biggest fruit size with maximum fruit weight of 113.17g in foliar nutrition with urea 0.5%. Highest yield of 20-22kg/tree was in urea 0.5% and KH2PO4 0.5% treatments. Highest number of fruits per tree (198-202 no.) was found in CaCl2 1% and 2%, combination of CaCl2 2% and boron (0.1 and 0.2%), and KH2PO4 0.5%. Highest number of biggest fruits with >100g weight was found in urea 0.5% treatment, followed by KNO3 2%. Maximum number of segments/fruit (6.7-7), number of viable seeds/fruit (1.7 -1.3) and minimum rind/pulp ratio (1.77-1.87) were found in treatments with urea 0.5% followed by KH2PO4 0.5% and KNO3 2%. Fruit firmness was maximum (8-9kg/cm2) and specific gravity was minimum (0.97-0.98) in CaCl2 1% and 2% followed by combination of CaCl2 2% with boron 0.1% and 0.2%. TSS, total sugars and organoleptic qualities were maximum and acidity low in treatments with KNO3 2%. Moisture content in fruit was highest in urea 0.5% with 70.87%. High values of TSS were also noticed in ZnSO4 300ppm and KH2PO4 0.5%. Total sugars was also high in KH2PO4 0.5%. Ascorbic acid content was high in boron 0.1%, ZnSO4 300ppm and KH2PO4 0.5%. Longest post harvest life of 21 days was obtained in CaCl2 2% treatment. Nutrient analysis revealed that all nutrient sprays significantly increased corresponding nutrient content in the leaf, rind and pulp along with positive effects on the uptake of elements. Mangosteen fruits have a storage and marketable life of not more than one week under tropical ambient conditions. Hence in the second experiment to extend shelf life, fruits kept at 5±10C, 10±10C, 15±10C, 20±10C and ambient temperature conditions after nutrient/growth regulator treatments and packing in 0.05mm LDPE bags. In the storage study, longest post harvest life of 24- 27 days was recorded in 15±10C followed by18-21days in 20±10C. Salicylic acid 3% and 2%, CaCl2 0.2% and GA3 600ppm were the best treatments in 15±10C and 20±10C temperatures with low rate of change in TSS, slow degradation of acidity and phenol, less weight loss and low pericarp hardening up to last stage of fruit storage. Fruits kept at very low temperatures showed only short storage life with 6 days in 5±10C and 10±10C without any treatments mainly due to chilling injury. But salicylic acid (3% and 2%) and GA3 600ppm treatments extended shelf life of mangosteen to 12-15 days. At ambient temperature superior treatments were salicylic acid 3%, CaCl2 0.2%, ethylene absorbent (KMnO4) and cling film with shelf life of 18-21 days. In all temperature regimes treatments with salicylic acid 2% and 3%, CaCl2 0.2% and 600ppm GA3 retained comparatively good storage quality of fruit with slow rate of senescence. N-acetyl cystene 0.05% and sodium erythrobate 2% alone and their combinations with calcium chloride 0.2% retained rind and pulp colour, and cling film wrapping of individual fruits reduced physiological loss in weight at all temperature conditions. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810027613 | |
| dc.keywords | Pomology and Floriculture | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Department of Pomology and Floriculture, Vellanikkara | en_US |
| dc.sub | Horticulture | |
| dc.subject | null | en_US |
| dc.theme | Mangosteen | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Improving quality and shelf life of mangosteen (Garcinia mangostana L.) | en_US |
| dc.type | Thesis | en_US |