Postharvest Application of Oligochitosan and Chitosan Reduces Calyx Alterations of Citrus Fruit Induced by Ethephon Degreening Treatment.
In the present study, we investigated whether the postharvest application of oligochitosan and chitosan could be used as potential alternatives to 2,4-dichlorophenoxyacetic acid (2,4-D) treatment to prevent calyx senescence of mandarin fruits induced by degreening treatment. The results of scanning electron microscopy indicated that the ethephon degreening treatment could accelerate the formation of pedicel abscission layers. Treatments with 15 g kg-1oligochitosan, 5 g kg-1chitosan, and 50 mg kg-12,4-D significantly suppressed the formation of pedicel abscission layers of ethephon degreening fruit and inhibited the browning of the calyx. These two treatments delayed the degradation of protopectin, cellulose, and lignin. Inhibition of the increase in the abscisic acid (ABA) content was also observed in these two treatments. In conclusion, these two treatments, particularly 15 g kg-1oligochitosan, could be potentially used as alternatives to 2,4-D to improve calyx alterations induced by the ethephon degreening treatment in mandarin fruits.
College of Food Science, Southwest University , Chongqing 400715, PR China.|Chongqing Engineering Research Center of Regional Food , Chongqing 400715, PR China.
Lili
L
Deng
College of Food Science, Southwest University , Chongqing 400715, PR China.
Baofeng
B
Yin
College of Food Science, Southwest University , Chongqing 400715, PR China.|Chongqing Engineering Research Center of Regional Food , Chongqing 400715, PR China.
Shixiang
S
Yao
College of Food Science, Southwest University , Chongqing 400715, PR China.|Chongqing Engineering Research Center of Regional Food , Chongqing 400715, PR China.
Weihao
W
Wang
College of Food Science, Southwest University , Chongqing 400715, PR China.|Chongqing Engineering Research Center of Regional Food , Chongqing 400715, PR China.
Kaifang
K
Zeng
D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry; D000040:Abscisic Acid / Q000737:chemistry; D002338:Carotenoids / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry; D002686:Chitin / Q000031:analogs & derivatives* / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D002734:Chlorophyll / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D002957:Citrus / Q000737:chemistry*; D003116:Color; D005030:Ethylenes / Q000737:chemistry; D035264:Flowers / Q000737:chemistry; D061353:Food Storage; D005638:Fruit / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009844:Oligosaccharides; D009943:Organophosphorus Compounds / Q000737:chemistry*; D010368:Pectins / Q000737:chemistry; D010937:Plant Growth Regulators / Q000737:chemistry; D010940:Plant Proteins / Q000737:chemistry
D005030:Ethylenes; D009844:Oligosaccharides; D009943:Organophosphorus Compounds; D010937:Plant Growth Regulators; D010940:Plant Proteins; C493484:oligochitosan; D002686:Chitin; D002734:Chlorophyll; D015084:2,4-Dichlorophenoxyacetic Acid; D002338:Carotenoids; D000040:Abscisic Acid; D010368:Pectins; D002482:Cellulose; D048271:Chitosan; C005073:ethephon
2,4-dichlorophenoxyacetic acid (2,4-D); calyx abscission; chitosan; ethephon degreening; mandarin; oligochitosan