外源钙对贮藏期马铃薯细胞膜及过氧化物酶的影响

The Effect of Exogenous Calcium on Cell Membrane and POD of Potato in the Storage Period

以马铃薯品种‘克新1号’为试验材料,研究钙离子对贮藏期马铃薯的影响,以期为Ca2+在马铃薯贮藏上的合理应用提供参考依据。利用0.5%和1.0%Ca(NO3)2进行采后浸钙处理,分析其对细胞膜的相对透性、丙二醛的含量及过氧化物酶活性的影响。整个贮藏期0.5%和1.0%钙处理相对电导率较对照分别降低了2.9和13.19个百分点,其中1.0%Ca2+处理的平均相对电导率最低,为61.07%,明显低于0.5%Ca2+处理的,也极显著的低于对照。随着马铃薯块茎贮藏的时间越来越长,3种处理的马铃薯块茎丙二醛含量在不断地降低,其中1.0%Ca2+处理的马铃薯块茎丙二醛含量低于0.5%Ca2+处理,且低于对照。3种处理的马铃薯块茎过氧化物酶活性的高低顺序为:1.0%Ca2+>0.5%Ca2+>CK。钙处理能有效降低相对电导率和丙二醛含量,提高过氧化物酶活性,从而增加马铃薯块茎的耐贮藏性,其中以1.0%Ca(NO3)2处理的效果最好。

Take potato variety Kexin 1# as the experimental material, to study the Ca2＋ effect on storageed potato in order to provide the reference basis of Ca2＋ reasonable applibation on potato storage. Processing the leaching of calcium by 0.5% and 1.0% Ca（NO3）＋ after picking, so as to analysis the effect on the cell relative membrane and POD activity. The relative conductivity of 0.5% and 1% calcium treatment during the entire storage period decreased respectively by 2.9% and 13.19% compared with the control, simultaneously the average relative conductivity of 1.0% Ca2＋ treatment is 61.07% as the minimum, which significantly lower than 0.5% Ca2＋ treatment and highly significant below the control. The MDA content of the three treated potato tubers continues to reduce along with the growth of potato tubers storage duration, which the MDA content of 1.0% Ca2＋ treated potato tuber less than 0.5% Ca2＋ treatment and lower than the control. The order of Peroxidase activity level in which of three treated potato tubers is： 1.0%Ca2＋〉0.5%Ca2＋〉CK. The results show that： Calcium treatment may reduce the relative conductivity and MDA content effectively, improve the POD activity, thereby to increase the storability of the potato tubers, and founded that the processing by 1.0%Ca（NO3）2 may obtain the best result.