Peach fruit acquired tolerance to low temperature stress by accumulation of linolenic acid and N-acylphosphatidylethanolamine in plasma membrane
2010
Zhang, Changfeng | Tian, Shiping
Peach fruit (Prunus persica L. cv. Beijing 33) did not show symptoms of chilling injury in 0°C-Air or 0°C-CA, but did in 5°C-Air after 21 d. The mechanisms by which 0°C storage could activate chilling tolerance of peach fruit were investigated by analysing characteristics of plasma membrane. We found that peach fruit stored in 0°C-Air and 0°C-CA had much higher linolenic acid content and unsaturation degree of plasma membrane than did that in 5°C-Air. In addition, the fruits stored in 0°C-CA showed a higher membrane fluidity and membrane integrity than did that in 0°C-Air, which was related to the accumulation of N-acylphosphatidylethanolamine (NAPE) of peach fruits stored in 0°C-CA. Based on these results, it appears that a higher unsaturation degree of membrane lipid and NAPE accumulation are beneficial for maintaining membrane fluidity, leading to an enhanced tolerance of peach fruit to chilling stress.
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