8个野生早熟禾种子萌发期耐盐性研究  

Salt Resistance of Eight Wild Poa L.Varieties during Seed Germination Stages

作　　者：白小明[1] 王靖婷[1] 贺佳圆[1] 董沁[1] 吕优伟[1] 孙吉雄[1] 

机构地区：[1]甘肃农业大学草业学院草业生态系统教育部重点实验室甘肃省草业工程实验室中-美草地畜牧业可持续发展研究中心,甘肃兰州730070

出　　处：《草地学报》2013年第3期546-555,共10页Acta Agrestia Sinica

基　　金：甘肃省高等学校基本科研业务费专项资金;甘肃省自然科学基金(0803RJZA035);国家科技基础条件平台工作项目(2004DKA30440);国家科技支撑计划课题(2011BAD17B05)

摘　　要：用不同浓度的NaCl和Na2SO4这2种单盐溶液处理8个野生早熟禾(Poa L.)种子,通过种子萌发特性的变化,研究其萌发时的耐盐能力,以期为耐盐早熟禾种质材料的筛选提供依据。结果表明:50mmol.L-1 NaCl促进波伐早熟禾(P.poophagorum)种子的萌发和草地早熟禾(兴隆山)(P.pratensis)、草地早熟禾(天祝)、硬质早熟禾(P.sphondylodes)胚芽的生长;25mmol.L-1 Na2SO4促进草地早熟禾(兴隆山)、草地早熟禾(天祝)、小药早熟禾(Poa micrandra)、硬质早熟禾、波伐早熟禾、草地早熟禾(甘南)种子的萌发,及小药早熟禾胚芽的生长。2种盐胁迫均抑制胚根的生长,且对胚根生长的影响大于胚芽;NaCl对种子萌发的影响大于Na2SO4。6个指标中,胚根长的平均耐盐临界值和耐盐极限值最小,作为8个野生早熟禾种子萌发期耐盐临界值和耐盐极限值比较可靠。种子萌发期耐盐性强弱依次为:小药早熟禾>波伐早熟禾>硬质早熟禾>草地早熟禾(兴隆山>草地早熟禾(肃南)>草地早熟禾(天祝)>草地早熟禾(甘南)>草地早熟禾(渭源)。In order to screen salt resistant varieties,the seeds of eight wild Poa L.varieties were treated with NaCl and Na2SO4 solutions and the effects of salt stress on the seed germination characteristics of this plant were investigated.Results indicated that the seed germination of P.poophaqorum and the coleoptile growth of P.pratensis（Xinglongshan）,P.pratensis（Tianzhu） and P.sphodylodes varieties were improved by 50 mmol·L-1 NaCl,while the seed germination of P.pratensis（Xinglongshan）,P.pratensis（Tianzhu）,P.pratensis（Gannan）,P.sphodylodes,P.poophaqorum and P.micrandra and the coleoptile growth of P.micrandra were improved by 25 mmol·L-1 Na2SO4.Both salt stresses inhibited the root growth more than the seedling growth of tested varieties.The effect of NaCl was more robust than Na2SO4 on seed germination.Among all six investigated indices,the average critical value and the ultimate values of salt resistance were minimum,thus both parameters can be used to evaluate the salt resistance of these wild Poa L.varieties.Salt resistances of these varieties were ranked as P.micrandra〉P.poophagorum〉P.sphondylodes〉P.pratensis（Xinglongshan）〉P.pratensis（Sunan）〉P.pratensis（Tianzhu）〉P.pratensis（Gannan）〉P.pratensis（Weiyuan）.

关 键 词：盐胁迫 野生早熟禾 种子萌发 耐盐临界值 耐盐极限值 

分 类 号：S543.9[农业科学—作物学] Q945.78[生物学—植物学]