PEG模拟干旱胁迫对玉带草生理特性的影响  

Physiological characteristics of Phalaris arundinacea cv.Picta under drought stress simulated by PEG

作　　者：刘晓东[1] 李洋洋[1] 何淼[1] 

机构地区：[1]东北林业大学园林学院,黑龙江哈尔滨150040

出　　处：《草业科学》2012年第5期687-693,共7页Pratacultural Science

基　　金：贵州省"十一五"重大专项"草坪工厂化生产技术研究与产业化示范推广"(黔科合重大专项字[2007]6006号);四川省科技厅应用基础研究专项基金资助项目(01SY051-27)

摘　　要：采用PEG-6000模拟干旱胁迫的方法,研究了不同质量浓度PEG-6000胁迫不同时间后玉带草(Phalaris arundinacea cv.Picta)叶片的形态和生理特性的变化,分析玉带草的耐旱性,以期为玉带草的应用和推广提供理论基础。结果表明,在胁迫下玉带草的叶枯率、细胞膜透性、丙二醛含量、游离脯氨酸含量呈升高趋势,可溶性蛋白含量先降低后升高,超氧化物歧化酶活性、过氧化物酶活性先升高后降低,且此7项指标均与胁迫质量浓度呈显著正相关;叶片含水量呈降低趋势,与胁迫质量浓度呈显著负相关。比较不同胁迫质量浓度下的形态和生理指标的变化,可以确定玉带草具有一定的耐旱性,但重度干旱胁迫会严重损伤玉带草。In order to provide the academic basis of application and popularization, morphological and physiological characteristics of Phalaris arundinacea cv. Picta under drought stress simulated by PEG-6000 with different concentrations and different periods were studied in this experiment. The results showed that the percentage of withered leaves, leaf relative electrolytic leakage, contents of MDA and free proline increased gradually; while content of water soluble protein declined firstly and then increased. SOD and POD activities welevated at begainning then declined. Above 7 parameters showed a significant positive correlation with PEG stress. However, the leaf relative water content decreased continuously and showed an obvious negative correlation with PEG stress. According to the morphological and physiological parame- ters under drought stress, P. arundinacea cv. Picta could be determined as a drought tolerance species and grew normally under moderate drought stress, but it would be damaged under severe drought stress.

关 键 词：观赏草 玉带草 PEG-6000 耐旱性 

分 类 号：S682.36[农业科学—观赏园艺]