盐碱胁迫对两种补血草种子萌发的影响  

Effects of salt and alkali stress on seed germination of Limonium gmelinii and Limonium otolepis

作　　者：师东[1] 张爱勤[1] 

机构地区：[1]新疆大学生命科学与技术学院,新疆乌鲁木齐830046

出　　处：《草业科学》2011年第8期1445-1450,共6页Pratacultural Science

摘　　要：大叶补血草(Limonium gmelinii)和耳叶补血草(L.otolepis)是白花丹科(蓝雪科)补血草属的多年生草本植物,是新疆盐生荒漠的主要建群种。经连续观测发现,自然居群中两种补血草实生苗的补充非常缓慢,推测可能与种子的萌发有关。以不同浓度的中性盐NaCl、碱性盐NaHCO3和两者的混合溶液分别对其进行种子萌发的胁迫试验。结果表明,不同浓度的盐溶液对种子的萌发都有影响,随着盐溶液浓度的升高,补血草种子的发芽率、发芽势、发芽指数均逐步降低;混合盐溶液对种子萌发的抑制作用最明显。在不同种类和浓度盐溶液的作用下,大叶补血草比耳叶补血草均表现出较强的耐盐性。复水试验表明,受胁迫的新鲜种子被转移到清水培养基上培养可恢复萌发,盐分对补血草种子的抑制作用主要为渗透胁迫。自然状态下,土壤盐分胁迫是补血草种群实生苗补充缓慢的重要因素。Limonium gmelinii and L. otolepis are perennial herbaceous plants and belong to Limonium, Plumbaginaceae. They are the main edificatos of haloeremion areas in Xinjiang. Continual observation ded icated that seedling recruitment was very slow in the population of the two species. As it may be related to the germination of seeds; the experiment was hypothesized to study the two Limonium seed germination under different concentrations of NaC1, NaHCO3 and mixed solution of NaC1 and NaHCO3. The results in dicated that all of the salt solutions at different concentrations influenced seed germination significantly. With increasing concentration of the solution; the germination rate, germination power and germination in dex of Limonium seeds decreased gradually. The mixed solutions had stronger influence than others in restraining the seed germination. The salt tolerance of L. gmelinii seed was stronger than that of L. otole pis under different treatments. The experiment also showed that when seeds were transferred from salt solutions to distilled water they could have a high germination rate. The salinity inhibition of the seed germination of Limonium was through osmotic stress. In natural Conditions, the soil salinity stress was one of the most important factors affecting seedling recruitment in the Limonium population.

关 键 词：大叶补血草 耳叶补血草 盐碱胁迫 种子萌发 

分 类 号：S567.239[农业科学—中草药栽培]