摘要
本试验以无芒雀麦、垂穗披碱草、老芒麦、细茎冰草为试验材料,研究了干旱胁迫处理下不同禾本科牧草的叶绿素荧光参数、叶片电导率和脯氨酸(Pro)含量变化的对比。结果表明:随着干旱胁迫程度的加剧,4种禾草初始荧光(Fo)和非光化学淬灭系数(qN)呈现逐渐上升趋势,而最大荧光(Fm),潜在光化学效率(Fv/Fo),最大光化学效率(Fv/Fm)和光化学淬灭系数(qP)呈现逐渐下降趋势。上述参数的变化幅度因材料抗旱性强弱而异,这种差异可作为简便评价禾草抗旱性强弱的鉴定指标,因此,运用隶属函数对不同禾草抗旱性进行评价分析,得出抗旱性强弱次序为:垂穗披碱草>无芒雀麦>细茎冰草>老芒麦。
The chlorophyll fluorescence parameters （Fo）, leaf conductance and proline content changes of four forage grasses, such as, Bromus inermis, Elymus nutans, Elymus sibiricus, Agropyron trachycaulum were meas- ured and analyzed under different drought stress treatment in the study. The results showed that： With the degree of drought stress, the minimal fluorescence （Fo） and non--photochemical quenching coefficient （qN） of four gras- ses trend to rise gradually, and the maximal fluorescence （Fro）, maximal photochemical efficiency of PS Ⅱ （Fv/ Fro） and photochemical quenching coefficient （qP） trended the gradual decline. Drought resistance changed range of the parameters for material strength. This difference could serve as a simple appraisal index for evaluation of the drought resistance in grass species. The order of the drought resistance for four grasses obtained by the analy- sis of membership function was Elymus nutans 〉 Bromus inermis 〉 Agropyron trachycaulum 〉 Elymus sibiri-cus.
出处
《草原与草业》
2014年第3期45-51,共7页
Grassland and Prataculture
基金
国家科技支撑项目(项目编号:2011BAD17B053)"内蒙古西部旱区优质牧草选育及生产利用技术集成与示范"
内蒙古科技厅科技支撑项目"优质牧草新品种选育技术研究"
关键词
干旱胁迫
禾本科牧草
叶绿素荧光
drought stress
forage grasses
chlorophyll fluorescence
