摘要
对5种草本地被植物(银水苏Stachys‘SliverCarpet’,百里香ThymusmongolicusRonn,金叶过路黄Lysimachiachristinae,佛甲草SedumLineare,常夏石竹Dianthusplumarius)干旱胁迫处理后的植株外部形态表现、水分临界饱和亏、叶片游离脯氨酸含量以及叶片细胞电导率等指标进行了观察测定。结果表明,干旱胁迫下,5种地被植物的生长势下降;叶片游离脯氨酸含量及电导率增加,且抗旱性相对较弱的植物增加幅度较大;复水后各种植物恢复程度不同;在用水分临界饱和亏反映植物的抗脱水能力及抗旱能力时,应与测定该值时离体叶片至永久萎蔫所用的时间结合起来考虑,否则可能与其实际表现不符。综合分析认为,5种草本地被植物抗旱性由强至弱顺序为:佛甲草>常夏石竹>银水苏>百里香>金叶过路黄。
Five ground cover plants,Betony ( Stachys lanata ‘Silver Carpet ’),Thyme ( Thymus mongolicus ),Loosestrife ( Lysimachia christinae ),Buddhanail ( Sedum Lineare ) and Cottage Pink ( Dianthus plumarius ),were examined to study their draught resistance.Some physiological and morphological indexes such as critical water saturation deficiency(CWSD),free proline content,electrical conductivity of leaves and shoot growth length were investigated and analysed after draught stress treatment.The result indicated that growth rate of five ground cover plants tended to decrease while the proline content and electrical conductivity would increase instead after the treatment.It seemed that the weaker draught resistance the plants had the greater increasing extent the electrical conductivity showed.When treated plants were watered as usual as CK they would resume to grow differently with different species.CWSD should be combined with the time during which the leaves tested became permanent wilting to represent the desiccation avoiding ability of the plants in place of CWSD application alone.Otherwise the value of CWSD would not correspond to the actual plant situation about draught resistance from time to time.According to multiple analysis,draught resistance order of five species are Buddhanail>Cottage pink>Betony>Thyme>Loosestrife.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2005年第5期130-134,共5页
Journal of Northwest A&F University(Natural Science Edition)
基金
天津市高等学校科技发展基金项目(20031307)
关键词
地被植物
抗旱性
水分临界饱和亏
游离脯氨酸
电导率
ground cover plants
draught resistance
critical water saturation deficiency
free proline
electrical conductivity
