University of Khartoum

Degreening of ‘Hamlin’ Oranges

Degreening of ‘Hamlin’ Oranges

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Title: Degreening of ‘Hamlin’ Oranges
Author: AbuGoukh, Abubakar A.
Abstract: The effect of ethrel solution on degreening of ma-ture green fruits of "Hamlin" oranges Citrus sinensis L. Osbeck was studied. Fruits were treated with 0, 1000 and 5000ppm ethrel mixed with 100u1/1 of surfactant x-78 and then stored at 15°C and 25° C and 93-95 relative humidity for two weeks. Application of 5000ppm ethrel was highly effective in inhaneing degreening of fruit stored at 25°C and 93-95% relative humidity. Application of 1000ppm and 5000ppm ethrel significantly reduced the level of chloro-phyll a, b and the total chlorophyll (a±b), compared to un-treated fruits stored at 15°C or 25°C with 93-95% rela-tive humidity. The reduction in the level of chlorophyll was higher in fruits treated with 5000ppm ethrel than those treated with 1000ppm ethrel. On the other hand, the reduction in chlorophyll levels was found to be sig-nificantly higher in untreated fruit stored at 15°C than those stored at 25°C. Significantly higher values of a/b ratio were noted to be associated with fruits treated with S000ppm ethrel and stored at 25°C compared with fruits treated with 1000ppm ethrel or untreated fruits which resulted in lower values of alb ratio. Negative values of a/b ratios were recorded in untreated fruits stored at 15°C or 25°C. However, storing untreated fruits at 15°C resulted in very low values of a/13 ratio. Fruit lightness (L-values), values of chroma (satu-ration index) were higher in fruits treated with S000ppm ethrel stored at 25°C than fruits treated with 1000ppm stored at 25°C or untreated fruits stored at 15°C or 25°C. However, fruits treated with S000ppm and stored at 25°C showed a smaller hue angle (Tan-I h/a) compared to 1000ppm ethrel and untreated fruits. Significantly lower values of chroma (saturation index) were associated with untreated fruits stored at 15°C or 25°C than fruits treated with 1000 ppm or 5000ppm ethrel and stored at 25°C. The rate of ethylene production by fruits treated with S000pprn ethrel and stored at 25°C was significantly higher than that produced by 1000ppm ethrel-treated fruits stored at 25°C or untreated fruits stored at 15°C or 25°C. The production of Co, was not affected by ethrel treatments.
URI: http://khartoumspace.uofk.edu/123456789/22284


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