几种荒漠植物种子萌发对干旱胁迫的响应及其抗旱性评价研究  

Response to droughty stresses and drought-resistances evaluation of seed germination of four desert vegetation

作　　者：何芳兰[1] 赵明[1] 王继和[1] 尉秋实[1] 张锦春[1] 

机构地区：[1]甘肃民勤荒漠草地生态系统国家野外科学观测研究站甘肃省治沙研究所,甘肃武威733000

出　　处：《干旱区地理》2011年第1期100-106,共7页Arid Land Geography

基　　金：国家"十一五"科技支撑计划项目(2007BAD46B00);甘肃省重大科技专项(0702NKDH030);中央级公益性科研院所基本科研业务专项资金项目(CAFYBB2007043)

摘　　要：以不同渗透势的PEG-6000溶液(0～-1.8 MPa)为模拟干旱胁迫条件,研究了盐爪爪(Kalidium foliatum)、黑果枸杞(Lycium ruthenicum Murr)、沙蒿(Artemisia arenaria)和油蒿(Artemisia ordosica)4种荒漠植物种子萌发及幼苗生长对干旱胁迫的响应。结果表明:干旱胁迫对4种荒漠植物种子萌发有显著的影响(P<0.05),盐爪爪种子萌发的最低渗透势阀值-1.5 MPa,苏枸杞、沙蒿和油蒿种子萌发的最低阀值均为-0.9 MPa;随着干旱胁迫的逐渐加剧,4种植物种子总萌发率、胚芽长度、初生根长度、幼苗鲜重及活力指数均呈下降趋势,并均小于对照;采用隶属函数法对干旱胁迫下4种植物的相对发芽率、相对萌发数、相对胚芽长度、相对初生根长度、相对幼苗鲜重、抗旱指数及相对活力指数进行综合评价,结果显示4种荒漠植物种子萌发阶段的抗旱性次序为:盐爪爪>沙蒿>油蒿>黑果枸杞。By the way of simulation drought,the seeds germination and seedling growth of four desert vegetations of Kalidium foliatum,Lycium ruthenicum,Artemisia arenaria and Artemisia ordosica were tested in distilled water appended PEG-6000(solution osmotic potentials were changed from 0 to-2.1 MPa),darkness and 25 ℃ for ten days.The results show that drought stress has a significant effect on seed germination and seedling growth of the four desert vegetations(P<0.05),and the lowest thresholds of osmotic potentia...

关 键 词：荒漠植物 干旱胁迫 种子萌发 抗旱性评价 

分 类 号：Q948.12[生物学—植物学]