多效唑对6种草坪草苗期抗旱性影响的研究

摘要

The wide use of turfgrass in urban landscaping has resulted in an increased water requirement for ma-intenance and management.A pot experiment was conducted to determine the physiological effects of different concentrations of paclobutrazol (PP333)on drought resistance of six turfgrass cultivars:two each of perennial ryegrass (Bomber and Esquire),red fescue (Beifang and Rubra)and kentucky bluegrass (Kentucky and Mer-it).Different concentrations of PP333 significantly increased the RWC,chlorophyll content and SOD activity, but decreased leaf relative electrical conductivity and proline content 30 d after drought stress,indicating that PP333 could effectively enhance the vitality and drought resistance of the six turfgrass cultivars.The optimal concentration of PP333 to increase the drought resistance was 100 mg/L for Esquire,Beifang and Rubra,200 mg/L for Bomber and Kentucky,and 300 mg/L for Merit.%草坪草在城市园林绿化中的广泛应用，加大了养护管理需水量。为了节约有限的水资源，本试验选用北方城市绿化常用的冷季型草坪草作为研究材料，采用盆栽方式，研究不同浓度的多效唑（PP333）对多年生黑麦草品种轰炸机（Bomber）、绅士（Esquire），紫羊茅品种北方（Beifang）、梦神（Rubra）以及草地早熟禾品种肯塔基（Kentucky）、优异（Merit）抗旱性的生理影响。研究结果表明，干旱胁迫30 d 后，多效唑处理能显著提高6种草坪草的 RWC、叶绿素含量和抗氧化物酶 SOD 活性，降低其叶片相对电导率、游离脯氨酸含量，这表明多效唑能有效提高它们的活力和抗旱性。通过对相关生理指标的综合比较分析，总结出对6种草坪草各苗期抗旱性能力有促进作用的最佳PP333浓度为：绅士、北方和梦神100 mg／L，轰炸机和肯塔基200 mg／L，优异300 mg／L。