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在低温条件下，测定了６个苜蓿品种子叶期幼苗体内游离脯氨酸的含量。结果表明，游离脯氨酸量的累积，对子叶期幼苗有保护作用，其累积能力与苜蓿品种子叶期幼苗的抗冻能力成负相关
At low temperature, the content of free proline in the seedlings of six alfalfa cotyledons was measured. The results showed that the accumulation of free proline had a protective effect on seedling of cotyledon stage, and its cumulative ability was negatively correlated with the frost resistance of seedling of alfalfa cotyledon