日照地区部分竹子的抗寒性研究

Reasearch on Cold Resistance of Some Bamboo Species in Rizhao

冬季低温是竹类植物在我国较高纬度地区园林绿化中得不到进一步推广应用的主要限制因子,为探究其抗寒性机理,扩大引种范围,本文以6个竹种(品种)为试材,测定电解质外渗率并拟合logistic方程求LT50,研究低温对可溶性糖、可溶性蛋白、游离脯氨酸等生理生化指标的影响。结果表明,随着低温胁迫加剧,电解质外渗率呈增加趋势,可溶性糖含量、可溶性蛋白含量、游离脯氨酸含量均表现出先上升后下降的趋势。综合所有抗寒性指标分析得出,6个竹种(品种)抗寒性顺序为:金镶玉竹>矢竹>罗汉竹>苦竹>箬竹>鸡毛竹。

As main limiting factor, low temperature in winter affects the use and promotion of Bamboo species in the land- scape greening of Chinffs higher latitudes. In order to explore cold resistance mechanism and expand the introduction range, six Bamboo species were used as test materials, lethal temperature 50 （LT50） was calculated with logistic formula through determi- ning electrolyte leakage rate. Influences of cold stress on soluble sugar contents , soluble protein contents and proline contents were investigated. With cold stress increased,electrolyte leakage rate increased, soluble sugar contents , soluble protein con- tents and proline contents decreased after an initial increase. By evaluating comprehensively the mechanism of cold resistance, the cold resistance of 6 bamboo species was evaluated as Phyllostachys aureosulcata cv. Spectabilis 〉 Pseudosasa japonica Phyllostachys aurea Carr. ex A. et C. Riv 〉 Pleioblastus amarus 〉 Indocalarnus longiauritus Hand. -- Mazz 〉 Shibataea chinensis Nakai.