低温胁迫对俄罗斯大果沙棘抗寒生理指标的影响

[目的]探讨不同低温条件下,沙棘抗寒生理指标变化及与抗寒性的关系。[方法]以俄罗斯大果沙棘1年生枝条为试验材料,通过-30~-10℃低温胁迫处理,测定其含水量、渗透调节物质、保护酶活性指标与抗寒性的关系。[结果]沙棘在低温条件下,枝条中自由水/束缚水比值较小,丙二醛含量随温度的变化而呈规律性变化;可溶性糖、可溶性蛋白含量随温度呈相反的变化趋势;随着温度的降低,沙棘枝条中保护酶活性增强。[结论]沙棘应对低温能力较强,通过各生理指标调节系统稳定,具有较强的渗透调节能力。

Effects of Low Temperature Stress on Physiological Indexes of Hippophae rhamnoides Hrm.Variety from Russia

[Objective] To investigate the physiological indexes of Hippophae rhamnoides and its relationship with cold resistance under the different low temperature.[Method] One-year old Russian Hippophae rhamnoides branches was used as experimental materials,and through-30——10 ℃ low temperature stress treatment, measured water content, osmotic adjustment, the relationship protected activity index and cold resistance.[Result] After low temperature treatment, shoots free water / bound water ratio was small, and MDA content changed with temperature regularly;Soluble sugar, soluble protein content with temperature showed the opposite trend;With decreasing temperature, the protection activity of Hippophae rhamnoides increased.[Conclusion] Hippophae rhamnoides has strong cold resistance, regulating system stability through physiological indices, with strong osmotic adjustment ability.