低温胁迫下7个引种核桃品种幼苗的抗寒生理生化特性研究

Study on Cold Tolerance of Introduced Walnut Seedlings under Natural Cold Stress

2012年以7个引种的核桃品种1年生苗叶片为研究对象,以云南地方品种漾濞泡核桃为对照,通过测定分析自然低温变化胁迫下膜透性、丙二醛和脯氨酸含量及变化情况,对8个核桃品种的抗寒性进行了初步研究。结果表明,温度降低后,3个生理指标皆呈上升趋势,但不同指标上升的幅度不同,同一指标中不同品种上升的幅度也各不相同。综合分析3个生理指标变化情况,8个参试品种(含对照)的抗寒性,Buccaneer和Axel较强;Coenen,Parisienne,Hanson和漾濞泡核桃次之;Lara和Fernette较差。

Taking seedlings of 7 introduced walnut cultivars and 1 local cultivar as samples, preliminary assess- ment on their cold tolerance was conducted through analyzing 3 physiological and biochemical indexes under natural cold stress. The results showed that with the decrease of natural temperature, 3 indexes namely relative electrical conductivity, MDA and proline content tended to increase. However, the increase extents were different among the cuhivars. Based on comprehensive analysis of all 3 indexes, 8 cultivars were divided into 3 groups according to their cold tolerance. The group I with 2 introduced cuhivars Buccaneer and Axel showed high cold tolerance, next came group 1I with 4 cuhivars Coenen, Parisienne, Hanson and Juglans sigillata, and group m with 2 in- troduce cuhivars Lara and Fernette showed the lowest tolerance.