摘要： 自内蒙古境内腾格里沙漠采集的斧翅沙芥(Pugionium dolabratum Maxim.)种子,研究不同温度和不同NaCl浓度对斧翅沙芥种子萌发的影响,评价其种子萌发的耐盐能力和探讨其在沙生盐渍环境中的萌发机理,从而为盐碱化荒漠植、草地的植被恢复和改良,以及耐盐植物的引种种植提供理论参考。结果表明:种子忍耐NaCl的极限浓度为150mmol/L,种子在NaCl中萌发的最适温度为25℃。将在各温度和NaCl溶液处理下不萌发的种子转移至蒸馏水中后,经200mmol/L NaCl前处理的种子具有较高的恢复萌发能力。另外,一定程度盐分前处理不但不会影响种子的萌发,而且会促进低温条件下种子的萌发,并有助于提高种子的萌发速率和萌发整齐度。讨论了斧翅沙芥种子的萌发特性与生存策略。

关键词: 斧翅沙芥, 温度, 盐分, 耐盐性, 沙生植物

Abstract: This paper studied the seed germination of Pugionium dolabratum Maxim.from Tengger desert in Inner Mongolia Autonomous under different temperature and NaCl concentration,to explore its seed germination of salt tolerance and germination mechanism of sand saline environments.Planting so as desert and grassland of salinization to be restored and improved,as well as the introduction and cultivation of salt-tolerant plants to provide theoretical reference.Results showed that seed germination tolerance NaCl limit concentration was 150 mmol/L.The optimal germination temperature for P.dolabratum was 25℃ in NaCl.Capacity for germination recovery was well by 200 mmol/L NaCl solution pre-treatment after ungerminated seeds transferred to distilled water.Further,adequate NaCl solution pre-treatment did not only no inhibit germination,but also increased germination,recovery germination rate and germination uniformity.This paper discussed P.dolabratum seed germination characteristics and adaptive strategy of this species that allows it to inhabit harsh saline conditions such as those in the deserts.

Key words: Pugionium dolabratum Maxim, Temperature, Salinity, Salt tolerance, Psammophyte

中图分类号: 

• Q949.748.3