title: Effects of fruit pre-harvest bagging on fruit quality of peach (Prunus persica Batsch cv. Hujingmilu).
abstract: Experiments were conducted to test the effects of pre-harvest bagging on fruit ripening and quality of peach (Prunus persica Batsch cv. Hujingmilu). Young fruits, at 50 days after full bloom (DAFB), were covered with bags made of single-, double-, and triple-layers of orange paper bag with 27.0%, 13.9% and 8.2% sunlight transmission, respectively. Ethylene production and respiration rate were measured, and fruit quality was analyzed at 111, 114, 117, 120 (firm-ripe stage) and 124 DAFB (full-ripe stage). Single- and triple-layer bagged fruits had higher ethylene production rates than double-layer bagged and un-bagged fruits. The skin of un-bagged fruit had higher brightness (L-value) but smaller hue angle (h degrees) at the full-ripe stage compared with that of bagged fruit. Flesh firmness of un-bagged fruit was higher than that of bagged fruit until the firm-ripe stage, although triple-layer bagged fruit had higher firmness than un-bagged fruit at the full-ripe stage. Total soluble solids in juice of single-layer bagged fruit were a little higher than those of other treated fruits at the full-ripe stage. Single-layer bagged fruit showed the highest level of gamma-decalactone, a main characteristic aroma of peach and total lactones at the firm-ripe and full-ripe stages. It was concluded that 'Hujingmilu' peach had high quality with abundant aromas when the fruits were bagged with single-layer orange paper bags at 50 DAFB. The biosynthesis of gamma-decalactone and other aromas may be affected by light to some extent.
authors.affiliation: Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.forename: Hui-Juan
authors.initials: HJ
authors.lastname: Jia
authors.forename: Xiao-Meng
authors.initials: XM
authors.lastname: Zhang
mesh_terms: D002849:Chromatography, Gas; D005030:Ethylenes / Q000378:metabolism; D005524:Food Technology / Q000379:methods; D005638:Fruit / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology; D009812:Odorants; D010101:Oxygen Consumption; D010936:Plant Extracts / Q000737:chemistry; D027861:Prunus / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology
chemical_list: D005030:Ethylenes; D010936:Plant Extracts; C036216:ethylene