温度、盐分和储藏时间对多花柽柳种子萌发的影响  

Study on the Effects of Temperature,Salinity and Storing Time on the Germination of Tamarix hohenackeri Seeds

作　　者：王磊[1,2] 严成[3] 魏岩[2] 尹林克[3] 

机构地区：[1]新疆农业大学林学院,新疆乌鲁木齐830052 [2]新疆农业大学草业与环境科学学院,新疆乌鲁木齐830052 [3]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011

出　　处：《干旱区研究》2008年第6期797-801,共5页Arid Zone Research

基　　金：国家自然科学基金(30770374);教育部新世纪优秀人才支持计划基金(2005);国家科技支撑计划课题(2007BAC17B03);草业科学国家重点学科资助

摘　　要：通过研究储藏时间、温度以及不同浓度NaC l溶液对多花柽柳种子萌发的影响,结果表明:多花柽柳种子褐色,棒状,长(0.368±0.005)mm,宽(0.172±0.004)mm,千粒重(20.518±2.500)mg;种子寿命约240 d;在5/15℃,5/25℃,15/25℃和25/35℃(光/暗=12/12 h)4个温变周期下,多花柽柳新成熟种子的萌发率均在90%以上,且彼此间差异不显著;盐分浓度小于0.2 mol/L时不抑制种子萌发,大于0.6 mol/L时萌发率随盐浓度的增高而降低,直至为零,且复水后恢复萌发率低,表明NaC1处理后的部分种子永久地失去萌发力。最后探讨了多花柽柳种子的萌发行为对荒漠环境的适应意义。Tamarix hohenackeri is a dominant shrubby perennial plant inhabiting in saline deserts of Xinjiang, China. In this study, an experiment of the germination of T. hohenackeri seeds is carried out so as to reveal the seed longevity and the effects of temperature, salinity and storing time on seed germination and germination recovery from the effects of saline conditions when seeds are moved to distilled water. A T. hohenackeri seed is （0. 368 ± 0. 005） mm in length and （0. 172 ±0. 004） mm in width; the mass of 1000 seeds is （20. 518±2. 500） rag. The results reveal that the germination percentage of seeds is decreased when seeds are stored at naturally-fluctuating temperatures in laboratory. The seed viability lasts for only about 240 days. Freshly harvested seeds can germinate well at four different thermoperiods （5/15 ℃, 5/25 ℃, 15/25 ℃ and 25/35 ℃ ）. There are no significant differences in germination percentages at four different thermoperiods. Germination of seeds is not significantly affected by NaCl solution with concentrations lower than 0.2 mol/L, but it is significantly decreased in NaC1 solution with concentration of 0.6 mol/L, and there are no seeds to germinate in NaCl solution with concentration of 0.8 mol/L. Seeds can incubate in NaCl solution with concentrations of 0.05 - 1.00 mol/L for 8 days after they are moved to distilled water for recovering. However, seed germination in NaCl solution is low, which reveals that some NaCltreated seeds may lose their germination capability.

关 键 词：多花柽柳 种子寿命 温变周期 盐分 萌发率 

分 类 号：S793.5[农业科学—林木遗传育种]