B. Modares, A. A. Ramin , C. Ghobadi,
Volume 4, Issue 11 (4-2014)
Abstract
1-Methylecyelopropene (1-MCP) is a new material which prevents the ethylene from reacting in quite low concentration and is easily consumed and does not exert negative effects on the human health and the environments. Therefore the effect of using zero concentration (Control), 0.25, 0.5, 0.75 and 1 µL.L-1 of 1-MCP on the storage life (1°C) and shelf life (20°C) of the fruits under 90% humidity throuth the 27 and 3 days was studied respectivly. The study of storage life was done through the split plot in time within a complete randomized design and the shelflife within a complete randomized design both in 3 replications. The results of storage life experiment showed that the marketability, firmness, citric acid (TA) ,vitamin C and the the ratio of TSS/TA were protected desirable in 1-MCP treatment. Amount of appearance decay was significantly reduced.The pH of fruit extract and also the fewest anthocyanins in the treatment of 1 µL.L-1 of 1-MCP were seen. This observation depicts the positive and significant effect of 1-MCP over the reduction in the speed of physiochemical characteristics changes in the fruit tissue. The highest fruit color indices include brightness (L), color regions (a* and b*) and Chroma (C) were seen in 1 µL.L-1 treatment. Moreover, the result obtained from the study over the effect of 1-MCP on the shelf life of strawberries in 20°C showed that this substances relatively positive effect on the preservation of fruit and it seems that 1-MCP is able to keep the quality of fruits over longer periods of time in usual degrees of temperature.
Ms. Faezeh Fateminia, Hossin Sadeghy, Vida Chalavi,
Volume 7, Issue 4 (2-2018)
Abstract
Apple fruit color is determined by the amount of pigments in its peel which is directly affected by sunlight. A method for improving apple fruit color is bagging. In present study, the effect of bagging and its optimum removing time was investigated on the amount of peel pigments and other fruit quantitative and qualitative characteristics for Fuji and Granny Smith apples. The experimental treatments were, no bag (control), debagging 7 and 14 days before harvest, and keeping the bag until harvest time. At the end of experiment, the amount of pigments, total soluble solids, titratable acidity, pulp phenol, peel phenol, antioxidants percentage, fruit weight and volume were measured. The results showed that in debagging 7 and 14 days before harvest treatments, the amount of anthocyanin and soluble solids statistically increased as compared with control; however other measured characteristics were significantly reduced in both apple cultivars. The maximum amount of fruit anthocyanin (60.96 mg/g fresh weight) belonged to Fuji cultivar in 14 days treatment and the least amount of fruit anthocyanin (1.64 mg/g fresh weight) belonged to Granny Smith cultivar in zero-day treatment. The highest amount of fruit chlorophyll a (5.09µgr/lit) was observed in control fruit and the lowest amount of fruit chlorophyll a (3.94 µgr/lit) was observed in 14 days treatment. The decrease of chlorophyll amount is a positive characteristic for the Fuji and a negative one for Granny Smith. Therefore, bagging and 14 days before harvest debagging treatment increased the amount of anthocyanin and decreased chlorophyll which resulted in Fuji cultivar better coloring and reducing the green color quality of Granny Smith cultivar.
S. Eshghi, S. Jamshidian, E. Tafazoli, A. Ramezanian,
Volume 10, Issue 4 (1-2021)
Abstract
In temperate and sub-temperate regions, short length of growing season is one of the main obstacles to successful commercial production of grapes. In a quest to overcome this concern, a factorial experiment in a randomized complete block design was conducted with three replications to evaluate the effect of application of dormax (1%) on early-blooming, followed by spraying ethephon (150 and 300 ppm), brassinosteroids (0.4 and 0.6 mg /L) and leaf removal at the onset of the leaf discoloration to examine the ripening time and quality characteristics of Askari grape (Vitis vinifera L. cv. Askari). Application of dormax had no significant increasing effect on carotenoid and decreasing effect on chlorophyll content of fruits. Leaf removal led to decreases in yield components such as cluster weight, number of berry in cluster and grape yield, and increases in the quality characteristics of grapes such as soluble solids, firmness, carotenoid content and color indices. Foliar-applied brassinosteroids (0.6 mg/L) + 1% dormax led to the best quantitative characteristics of grapes. The most desirable quality and color characteristics of fruits were observed with application of 1% dormax + 300 ppm ethephon.
