三种高寒牧草种子萌发期耐镉性研究  

Cadmium tolerance of three alpine herbages during seed germination

作　　者：胡樱 王慧春 贾慧萍 朋毛德吉 周碧瑶 魏晶晶 HU Ying;WANG Huichun;JIA Huiping;PENG Maodeji;ZHOU Biyao;WEI Jingjing(College of Life Sciences,Qinghai Normal University,Xi’Ning 810008;Key Lab.of Tibet Plateau Biodiversity Formation Mechanism and Comprehensive Utilization,Xi’Ning 810008;College of Geographical Sciences,Qinghai Normal University,Xi’Ning 810008,China)

机构地区：[1]青海师范大学生命科学学院,西宁810008 [2]青海省青藏高原生物多样性形成机制与综合利用重点实验室,西宁810008 [3]青海师范大学地理科学学院,西宁810008

出　　处：《干旱区资源与环境》2023年第2期171-176,共6页Journal of Arid Land Resources and Environment

基　　金：青海省重大生态保护工程生态监测体系运行项目(2020-031,2021-013);青海省科技特派员专项(2022-NK-KTP38)资助。

摘　　要：为了解无芒披碱草(Elymus sinosubmuticus S.L.Chen)、麦薲草(Elymus tangutorum(Nevski)Hand.-Mazz.)和同德老芒麦(Elymus sibiricus L.)三种高寒牧草种子的耐镉性,设置0、5、10、20、40mg·L^(-1)镉胁迫液浓度探究它们的发芽和生长情况。结果表明:镉胁迫对无芒披碱草和同德老芒麦种子的发芽率、发芽势、发芽指数、株高、叶长与根长均具抑制作用,而麦薲草部分指标表现为“先促后抑”,在5mg·L^(-1)镉处理下,麦薲草种子发芽率、发芽指数株高和根长具促进作用。通过隶属函数指数法计算,三种牧草镉耐大小为无芒披碱草>同德老芒麦>麦薲草,无芒披碱草可优选作为镉污染土地种植材料。In order to study the cadmium tolerance of seeds of Elymus sinosubmuticus S.L.Chen,Elymus tangutorum(Nevski)Hand.-Mazz.and Elymus sibiricus L.,their germination and seedling growth were quantified to evaluate the cadmium tolerance under the treatment of different concentrations of cadmium(0,5,10,20,40mg·L^(-1)).The results showed that cadmium stress inhibits the seed germination rate,germination potential,germination index,plant height,leaf length and root length of E.sinosubmuticus,E.sibiricus,and E.tangutoru.Partial indicators,such as germination rate,germination index,plant height and root length in E.tangutoru are promoted under 5mg·L^(-1)cadmium treatment,and then inhibited while the cadmium concentration increases.The method of fuzzy membership was used to evaluate the cadmium tolerance of the three grasses,and result shows that their rank is E.sinosubmuticus>E.sibiricus>E.tangutorum.So,the E.sinosubmuticus can be the species chosen firstly planting in cadmium-contaminated land.

关 键 词：镉胁迫 高寒植物 无芒披碱草 同德老芒麦 麦薲草 种子萌发 

分 类 号：Q945.78[生物学—植物学]