We found that similar O2 concentrations on MA-A film-treated pears conferred the different results on internal browning, according to CO2 levels (Tables 1). In addition, those symptoms were also suffered by the control under high O2 levels ( ̴20.5 %) after 5 months in storage. These results suggest that 5 – 9 % O2 may not promote the internal browning development on ‘Silver Bell pear