前期低氧处理对梨虎皮病的防控及乙烯释放的影响

以'鸭梨'为试材,空气处理为对照,分析比较前期超低氧胁迫(0.8％02+0.5％C02处理15 d,转入5.0％02+0.5％C02长期贮藏)、静态低氧气调(降温后直接转入5.0％02+0.5％C02)和"两阶段"缓慢降氧气调(10.0％02+0.5％C02处理15d,转入5.0％02+0.5％C02长期贮藏)对'鸭梨...

Effects of Initial Low Oxygen Treatments on Superficial Scald Prevention and Ethylene Release in Pear

This study aimed to compare the effect of initial ultra-low oxygen stress(0.8%O2+0.5%CO2 for 15 d and then stored at 5.0%O2+0.5%CO2),static controlled atmosphere(CA)(5.0%O2+0.5%CO2)and two-stage oxygen reduction CA(10.0%O2+0.5%CO2 for 15 d,then transfer to 5.0%O2+0.5%CO2 for long period storage)on superficial scald prevention and ethylene release of‘Yali’pear.Superficial scald incidence,α-farnesene and conjugated trienols(CTols),fruit quality,respiration intensity,ethylene release rate and relative expression of ethylene biosynthesis and signaling pathway genes were compared and analyzed after storage for 180 d and 240 d plus 7 d shelf-life,and taking air treatment as control.The results showed that compared with the air,initial ultra-low oxygen stress,static CA and two-stage oxygen reduction CA could inhibit the superficial scald effectively,after storage for 240 d and 7 d shelf-life,the superficial scald incidence followed as the order of air(93.75%)>two-stage oxygen reduction CA(80.00%)>static CA(62.50%)>initial ultra-low oxygen stress(53.57%).Further research found that,CA treatments declined the accumulation of conjugated trienols in fruit peel tissue during long period storage,and better maintained the titratable acid and vitamin C contents,inhibited the ethylene production and delayed the ethylene release peaking time.At meanwhile,the relative expression of Pb ACO1,Pb ACO3 and Pb ACS1 genes were significantly decreased at the early time of shelf-life period,and the Pb CTR1 and Pb ERF1 were enhanced by initial ultra-low oxygen stress and low oxygen controlled atmosphere,while the relative expression of Pb ETR2 were up-regulated fast with the increase of ethylene production during shelf-life period.