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垫江白柚果实采后在自然通风库贮放60天时果皮POD出现活性高峰,之后下降,且处于较低水平,同时MDA含量及累积速率较快;果实枯水也在60天时开始出现,之后枯水程度逐渐加重。经冷激处理后果皮POD活性在贮藏中后期保持较高水平,果皮及果肉中MDA含量及累积速度较缓,果实枯水现象得到延缓。长寿沙田柚果皮POD活性远高于垫江白柚,均活性为垫江白柚2倍,其果皮及果肉中MDA含量低且累积速率慢,果实在贮期内未出现枯水现象。POD同工酶谱显现沙田柚在慢区具特有的1、4酶带,而垫江白柚在慢区及快区各具一条明显酶带,冷激没有改变原有酶谱,只是谱带强弱受到调节。
POD activity of Dianjiang white pomelo fruit after harvesting in natural ventilation store for 60 days peaked, then decreased, and at a lower level, MDA content and accumulation rate was faster; fruit dryness began to appear in 60 days, then dry Degree gradually increased. The POD activity of pericarp maintained a high level in the late stage after cold shock treatment, and the content and accumulation of MDA in pericarp and pulp were slow, and the fruit dry phenomenon was delayed. The POD activity of peel of long-lived Shatian pomelo was much higher than that of Dianghuai white grapefruit, with the activity of 2 times of that of Dianjiang white grapefruit. The content of MDA in the peel and pulp was low and the accumulation rate was slow. POD isozymes showed pomelo in the slow zone with unique 1,4-band, and Dianjiang white grapefruit in the slow zone and the fast zone with a distinct enzyme band, cold shock did not change the original zymogram, but the band strength Be regulated