聚乙二醇-6000胁迫下十二个草地早熟禾品种萌发期抗旱性比较研究  

Study on Drought Resistance at Germination Stage of 12 Varieties of Poa pratensis L.under PEG-6000 Stress

作　　者：王彬[1] 李长鼎 兰剑[1] 马仲泽 许兴[1] 

机构地区：[1]宁夏大学农学院,宁夏银川750021 [2]临沂市科技局,山东临沂276000 [3]宁夏恒安建设监理咨询有限公司,宁夏银川750001

出　　处：《北方园艺》2012年第24期54-58,共5页Northern Horticulture

基　　金：国家科技支撑计划资助项目(2011BAC07B03)

摘　　要：采用5种不同水势(0、-0.3、-0.6、-0.9、-1.2MPa)的PEG-6000溶液对12个品种草地早熟禾种子在萌发期进行人工模拟干旱胁迫,测定了相对发芽率、胚根胚芽比、萌发指数和耐旱指数等指标,开展了不同品种草地早熟禾种子萌发期抗旱性比较研究。结果表明:草地早熟禾种子萌发的适宜水势为≥-0.46MPa,而其萌发期抗旱临界水势可能在-0.6MPa左右。利用聚类分析得出在12个供试品种中,"阿波罗"、"自由2"和"超级伊克利"的抗旱性较强;"大跃进"、"辉煌"和"午夜2号"的抗旱性次之;"使命"、"美洲王"和"浪潮"的抗旱性一般;"兰月"、"奖品"和"阔雅"的抗旱性较弱。12 varieties of Poa pratensis L. were treated with PEG-6000 solution at concentrations of 0（CK）,--0. 3,--0. 6, --0. 9 and --1.2 MPa in order to assess the effects of drought on relative germination rate,ratio of radicle and embryo, germination index as well as drought-tolerance index at germination stage. The results showed that the suitable water potential of Poa pratensis germination was more than or equal to --0. 46 MPa and the critical water potential of drought tolerance of Poa pratensis probably around --0.6 MPa at germination stage. At last, the method of comprehensive clustering analysis was used to evaluate the different tolerance of the experimented varieties and the restilt was ＇Apollo＇, ＇Freedom II＇ and ＇Super icelly＇ had better drought resistance, ＇Big bound＇, ＇Resplendence＇ and ＇Midnight II＇ had good drought resistance, ＇ Mission＇, ＇ America king＇ and ＇ Impact＇ were middle, ＇ Btuemoon＇, ＇ Award＇ and ＇ Broad elegant＇ had worse drought resistance.

关 键 词：草地早熟禾 萌发期 干旱胁迫 抗旱性PEG-6000 

分 类 号：S68[农业科学—观赏园艺]