干旱胁迫对‘紫叶’狼尾草生长发育及生理特性的影响

以观赏草‘紫叶’狼尾草 Pennisetum setaceum ‘Rubrum’为试验材料，研究不同程度干旱胁迫对其生长发育及叶绿素含量、脯氨酸含量、丙二醛含量、根系活力的影响。结果表明：5％聚乙二醇处理与CK之间，除脯氨酸含量差异显著外，其他生长发育及生理指标差异不显著；10％、20％聚乙二醇处理，紫叶狼尾草株高、分蘖数、根长、地上部鲜重和干重、地下部鲜重和干重以及根系活力较5％聚乙二醇处理、CK明显降低，叶绿素含量显著下降，而脯氨酸、丙二醛含量显著增加，但是紫叶狼尾草的生长发育尚未出现枯萎状态。综合而言，紫叶狼尾草具有很强的抗旱性，能承受一定程度的干旱胁迫。

Effect of Drought Stress on Growing Development and Physiological Characteristics of Pennisetum setaceum

The effects of different degrees drought stress on growing development ,chlorophyll content ,proline content ,MDA content and root activity were researched by application ornamental grass Pennisetum setaceum ＇Rubrum＇as the test material .The results showed that there was significant difference in proline content between treatment 5% polyethylene glycol （PEG） and CK ,and there were no difference in other growing development and physiological indexes .The plant height ,tiller ,root length ,above ground fresh and dry biomass ,underground fresh and dry biomass ,root activity of Pennisetum setaceum ＇Rubrum＇by treatment of 10% and 20% PEG decreased significantly than that by treatment of 5% PEG and CK .At the same time the chlorophyll content of 10% and 20%PEG reduced significantly ,but the content of proline and MDA content increased significantly .Pennisetum setaceum＇Rubrum＇can still grow and develop normally ,which was not wither .In summarize ,Pennisetum setaceum＇Rubrum＇has strong drought resistance ,which can endure drought stress to some degree .