摘要
以多年生黑麦草(Lolium perenne L.)、垂穗披碱草(Elymus nutans Griseb)、毛穗新麦草(Psathyrostachys lanuginosa(Trin.)Nevski)、高羊茅(Festuca arundinace)、草地早熟禾(Poa pratensis L.)、扁穗冰草(Agropyron cristatum(L.)Gaertn)和紫羊茅(Festuca rubra L.)7种牧草为试验材料,研究了干旱胁迫下不同禾本科牧草的存活率及叶绿素荧光参数的变化。结果表明,随着干旱胁迫时间的延长,7种牧草的初始荧光(F_0)呈现逐渐上升的趋势,可变荧光(F_v)、PSⅡ潜在活性(F_v/F_0)、最大光化学效率(F_v/Fm)呈现逐渐下降的趋势。运用隶属函数对7种牧草抗旱性进行评价分析,初步评定高羊茅的抗旱性最强,其次为多年生黑麦草、毛穗新麦草、草地早熟禾、扁穗冰草和紫羊茅,垂穗披碱草的光合机制受到的破坏程度最大,初步评定其抗旱性最弱。
The chlorophyll fluorescence parameters and survival rate changes of seven kinds of pasture,such as Lolium perenne L., Elymus nutans Griseb,Psathyrostachys lanuginosa（Trin.） Nevski, Festuca arundinace, Poa pratensis L.,Agropyron cristatum（L.） Gaertn,Festuca rubra L. were measured and analyzed under different drought stress treatment. The results showed that,with the prolonging of drought stress time, the minimal fluorescence（F_0） of seven pasture increased gradually,and the variable fluorescence（F_v）,PSII potential activity（F_v/F_0） and maximal photochemical efficiency of PSII（F_v/Fm） decreased gradually. The order of the drought resistance for seven pasture obtained by the analysis of membership function was as follows： F. arundinace drought was the strongest, followed by L. perenne L., P. lanuginosa（Trin.） Nevski, P. pratensis L.,A. cristatum（L.） Gaertn and F. rubra L.,the photosynthetic mechanism damage extent of E. nutans Griseb is maximum, and its drought resistance is weakest by preliminary assessment.
出处
《湖北农业科学》
2017年第1期107-111,共5页
Hubei Agricultural Sciences
基金
国家自然科学基金项目(51104127)
教育部创新团队资助项目(IRT1180)
关键词
牧草
干旱胁迫
叶绿素荧光参数
pasture
drought stress
chlorophyll fluorescence parameter
