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本实验以分属特早熟、中熟和晚熟三类不同抗冷级别的９个棉花品种为材料，将其幼苗经４℃低温处理１５小时，测定ＰＯＤ活性，并与未经冷冻处理的相应测定值进行分析比较。结果表明：（１）未经冷冻处理的棉苗（即对照）中的ＰＯＤ活性的大小与品种的抗冷性强弱成明显的正相关；（２）经低温处理后的所有供试品种的ＰＯＤ活性都有不同程度的提高，提高幅度与品种的抗冷性比成明显的负相关。因此．我们建议可将棉苗中的ＰＯＤ活性大小作为划分棉花苗期抗冷性级别的生化指标之一。
In this experiment, nine cotton cultivars with three types of precocious, moderate and late ripening were used as materials, and the seedlings were treated with low temperature for 4 hours at 4 ℃. The activity of POD was determined and compared with the corresponding untreated Value analysis and comparison. The results showed that: (1) There was a significant positive correlation between the POD activity of cold-tolerant cotton seedlings (control) and the cold tolerance of the cultivars; (2) POD activity have different degrees of improvement, increased range and variety of cold resistance than into a significant negative correlation. therefore. We propose to use the size of POD activity in cotton seedlings as one of the biochemical markers of cold tolerance in cotton seedlings.