【摘 要】
：
Fruits are rich in phenolic compounds and exhibit high antioxidant activity.Recent studies have shown that wounding caused by cutting and some post-cutting treatments can increase the biosynthesis of
【机 构】
：
College of Food Science and Technology,Naniing Agricultural University,Naniing 210095,China
【出 处】
：
2015 International Conference on Fruit Quality Biology (第二届果
论文部分内容阅读
Fruits are rich in phenolic compounds and exhibit high antioxidant activity.Recent studies have shown that wounding caused by cutting and some post-cutting treatments can increase the biosynthesis of phenolic compounds and improve the antioxidant activity of several fresh-cut fruits and vegetables.However,there is a need to better understand if these responses are tissue-dependent.In the present study,the effect of different degrees of wounding stress and a pre-cutting methyl jasmonate(MeJA)treatment on total phenolic content and antioxidant activity of fresh-cut pitaya fruits during 4 days of storage at 15℃ was investigated.For the wounding intensity study,pitaya fruits were cut into slice(1cm thickness),half-slice(1/2 section from a slice of 1cm thickness)and quarter-slice(1/4 section from a slice of 1cm thickness)to generate different wounding intensities,with the intact pitayas without any wounding as the control.For MeJA pretreatment study,intact pitaya fruits were first treated with 0,1,10 or 100 μmol/L of MeJA and then cut into quarter-slice.Total phenolic content(TPC),antioxidant activity(AA)and phenylalanine ammonia-lyase(PAL)activity in all fresh-cut produce increased significantly during storage compared with whole pitaya fruits.This enhancement in TPC,AA and PAL activity increased with wounding intensity.Increases in reactive oxygen species(ROS)production was also observed in all fresh-cut pitaya fruits.Pre-cutting treatment with 1001μmol/L of MeJA further promoted the increase in TPC,AA,PAL activity and ROS production in quartersliced pitaya fruits.These results demonstrated that increasing wounding intensity and pre-cutting MeJA treatment can enhance the biosynthesis of phenolics compounds and improve the antioxidant activity of fresh-cut pitaya fruits.ROS may play a key role as signaling molecules in wounding-induced biosynthesis of phenolic compounds in fresh-cut pitaya fruits.
其他文献
Sugars,including soluble sugars and sugar alcohols,are significant energy and components contribute to the quality and taste of fruits,and also affect stress resistance of fruits.Sucrose,as the major
Phytohormone ethylene controls diverse developmental and physiological processes such as fruit ripening via modulation of ethylene signaling pathway.Our previous study indicated that EHYLENE RESPONSE
Background: Litchi deteriorates with the pericarp turning brown within 1-2 days after harvest.MicroRNAs act as negative regulators involved in almost every physiological process.To understand the mech
Ethylene is known to have profound effects on the postharvest quality of climacteric fresh produce.Understandably,far less emphasis has been given to understanding the role that ethylene might have in
A perceived lack of flavor is a major source of consumer dissatisfaction with fresh market tomatoes.Postharvest handling and retail systems contribute to poor tomato flavor,particularly by chilling fr
Using a non-heated solvent extraction and gas chromatography-mass spectrometry(GC-MS)method,the impact aroma compound,2-acetyl-1-pyrroline(2AP),was confirmed,for the first time,to be naturally occurre
Chromoplast development plays an important role in flesh color formation in watermelon(Citrullus lanatus)fruit.Here,we identified a watermelon phosphate transporter gene ClPHT4 which is critical for t
Applied research on the production and storage of fruit is often responding to the needs of industry to solve problems and/or exploit economic opportunities.In New Zealand we often use consumer resear
Ethylene is one of the most important plant hormones that participate in regulation on fruit ripening and influence postharvest qualities,by accelerating fruit aroma and flavour release,softening/lign
Postharvest research is relatively young and has been rapidly increasing since the 1980s.Its main objective is to reduce postharvest losses by enlarging insight in the underlying physiological process