不同酸枣实生苗抗寒性差异比较

为了筛选出抗寒能力强的酸枣类型,以不同种源、株型和树龄酸枣实生苗为试验材料,研究了人工设置低温胁迫处理和自然降温对酸枣实生苗离体枝条的脯氨酸、可溶性糖、丙二醛、可溶性蛋白含量的影响。结果表明:脯氨酸、可溶性糖、可溶性蛋白含量高有利于酸枣抗寒;丙二醛含量高不利于抗寒。综合分析河北邢台市种源的酸枣抗寒能力最强,其次是山西太原市、陕西渭南市和辽宁朝阳市。不同株型中,直立枝弯曲型酸枣抗寒能力最强,丛生型酸枣抗寒能力最差。2年生酸枣离体枝条抗寒能力强于1年生酸枣。脯氨酸、可溶性糖、丙二醛、可溶性蛋白含量可以作为衡量酸枣抗寒性的关键指标。

Comparison on Cold Resistance of Different Ziziphus jujuba var.spinosa(Bunge) Hu Seedlings

One-year Ziziphus jujuba var.spinosa(Bunge)Hu seedlings from four provenances with different plant types and different tree ages were used to study the effects of natural cooling in winter and different low-temperature treatment on the dormant branchs's physiological and biochemical indicators,proline,soluble sugar,malondialdehyde(MDA) and soluble protein contents.The results showed that higher-level proline,soluble sugar,soluble protein in Ziziphus jujuba var.spinosa(Bunge)Hu favoured cold hardiness,with MDA being the opposite.The seedlings from Xingtai,Hebei province had the most cold hardiness,following by Taiyuan of Shanxi,Weinan of Shanxi and Chaoyang of Liaoning.Vertical branches bending seedlings had the strongest cold hardiness;tufted seedlings were the worst ones.Two-year Ziziphus jujuba var.spinosa(Bunge)Hu seedlings were more stronger than the 1-year ones based on a comprehensive analysis.Proline,soluble sugar,MDA and soluble protein content can be used as key measure indicators of Ziziphus jujuba var.spinosa(Bunge)Hu cold resistance.