作　　者： ; (阎顺国）;

机构地区： 甘肃草原生态研究所

出　　处： 《植物生态学报》 1996年第5期414-422,共9页

摘　　要： 以种子在盐溶液中的相对发芽率作为种子萌发期耐盐性指标，定量分析了种子生产条件与萌发期温度，盐分（类型与浓度）等生态因子对碱茅（Ｐｕｃｃｉｎｅｌｌｉａｔｅｎｕｉｆｌｏｒａ）种子萌发期耐盐性的影响。生产条件选取了３个生产年份或贮藏时间（年），用３个不同的种批表示，处理溶液有不同浓度（或渗透势）的ＮａＣｌ，ＣａＣｌ＿２与Ｎａ＿２ＳＯ＿４３种盐溶液和渗透胁迫剂ＰＥＧ（６０００）组成，处理温度有两个变温１０（１６ｈ）～２５℃（８ｈ）与１５（１６ｈ）～２５℃（８ｈ）条件组成。随溶液渗透势降低，种子相对发芽率线性下降，线性回归关系式中的回归系数与回归截距分别反映溶液的渗透与离子效应的相对大小。本试验条件下，碱茅种子生产条件对种子活性（以水中的发芽率表示）有显著影响，但对耐盐（ＮａＣｌ）性无显著影响。溶液类型与温度条件主要通过改变溶液的离子效应影响种子耐盐性，对渗透效应无显著影响，两种变温条件下，４种溶液对碱茅种子的渗透效应是溶液渗透势每降低１．０ＭＰａ，相对发芽率降低５２．３１％。１０～２５℃变温条件下，与ＰＥＧ溶液相比，３种盐溶液的离子效应是使碱茅种子相对发芽率分别增加１４．０％，１５．１％’与２１．６％，表现为对种子? The experiments were conducted to investigate the effect of ecological factors, such as treatment solutions and temperature on the salt tolerance of the Puccinellia tea tenuiflora seeds. The relative germination ratio were used as a measurement for its salt-tolerance. The experiments includs 2 treatment temperatures, 3 seedlots and 4 solutions (PEG,NaC, CaCl_2, and NaSO_4) with the different osmotic potentials or concentrations. Relative germination was linearly decreased as the osmotic potential of the solutions decreased, and the regression coefficient and intercept of regression equation reflected magnitude of osmotic and ionic effect of the solution on germination, respectively. No evident difference of the relative germination in salt solutions exited among the seedlots with significantly different germination in water. Solution types and ambient temperature during germination affected salt-tolerance of seeds through modifying ionic effect of solutions, but they caused no alteration of osmotic effect of the solutions on germination. The osmotic effect of the four solutions on germination of Puccinellia tenuiflora was a decrease of the relative germination rate by 52. 3% with a 1. 0 mpa decrease of osmotic potential. The increase of the seed germination rates by treatment of the 3 osmatic potential salt solution were 14. 0%, 15. 1% and 21. 6% in comparison with that of PEG, under a temperature of 10～ 25℃. The ionic effect of NaCl solution was 17. 0% lower under 15～25 ℃ than that under 10～25 ℃

关 键 词： 碱茅 萌发 耐盐性 生态因子

领　　域： [生物学] [农业科学]