In order to explore effects offrozeninjury onfreezing-tolerancemechanism oflfower budsinalmond, the freezing-toleranceabilities oflfower budsin cultivated Yingzuialmondandwildalmondwere comparedandanalyzed by processing the twokinds ofalmond buds under-4℃ condition,and the change curves of soluble sugar, starch, soluble protein,MDA, prolineandrelative electric conductivityinlfower budsin 24 hourswere determined. Averagemembership functionvalues of six physiologicalindexesin the twokinds offlower budswere calculatedand compared by using thefuzzymembershipfunctionmethod. Theresults showed that: the contents of soluble sugarandMDA changedfrom rising tofalling,and then torising; the contents of soluble proteinand starchwere decreasedatifrstand thenincreased; the proline contentin Yingzuialmondlfower buds changedfromrising tofalling,whileitinwildalmondlfower buds changedfromrising tofalling,and then torising; therelative conductivityin the twokinds ofalmondlfower budswere increased by"S" shape. Theresults ofmembershipfunctionvalues suggested that: theaveragemembershipfunction values of the six physiologicalindexeswereincreasedatifrstand then decreased, so thefreezing-toleranceabilities of the twokinds ofalmondlfower budswereincreasedand then decreased under-4℃ treatment, but thefreezing-tolerance ability oflfower budsin Yingzuialmondwas stronger than that oflfower budsinwildalmond.%为了了解低温冻害对扁桃花蕾抗寒机制的影响情况,比较分析了栽培扁桃鹰咀和野生扁桃花蕾的抗寒能力,对栽培扁桃鹰咀花蕾和野生扁桃花蕾进行了-4℃的低温处理,观测了在低温处理24 h内花蕾中的可溶性糖、淀粉、可溶性蛋白质、丙二醛、脯氨酸和相对电导率的变化曲线;还利用模糊隶属函数法对两种扁桃花蕾6个生理指标的平均隶属函数值进行了计算与比较分析.观测发现:可溶性糖含量、丙二醛含量均先升高后降低再升高;可溶性蛋白质含量、淀粉含量均先降低后升高;鹰咀扁桃花蕾中的脯氨酸含量先升高后降低,而野生扁桃花蕾中的脯氨酸含量先升高后降低再升高;两种扁桃花蕾的相对电导率均呈"S"曲线升高.隶属函数计算结果显示:6个生理指标的平均隶属函数值先升高后降低,说明在-4℃的低温处理下两种扁桃花蕾的抗寒能力均先升高后降低,但鹰咀花蕾的抗寒能力强于野生扁桃花蕾.
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