Physiological quality analysis of different peach cultivars.

Seven peach cultivars were used to study the fruit quality,the size,weight,firmness,total soluble solids,titratable acid,soluble sugar,organic acid,ethylene production rate and respiration rate of fruits were also determined.The results showed that the new cultivar of 'X2-5' had the highest sugar/acid ratio,better flavor,hard firmness,but the peak of its ethylene and respiration rate came earlier than other cultivars,indicating that the storage time of this cultivar was possibly shorter than others.It was also found that three Japanese peaches fruit had higher TSS and sugar/acid ratio,better flavor.Among which,'Akatsuki' fruit was the hardest,but its ethylene production was the lowest;'Baili' fruit also had lower ethylene and respiration rate.The 'Dayubaifeng' fruit,whose size was the smallest,had highest ethylene and respiration rate.