叶面喷施生长延缓剂对多年生黑麦草生长及生理的影响

Effects of foliar application with plant growthretardant on the growth and physiologyof perennial ryegrass

摘要:

为明确植物生长延缓剂对草坪草生长及生理特性的影响,以多年生黑麦草(Lolium perenne)绅士品种为材料,设置不同浓度梯度的乙烯利(200、500、1 000、1 200、1 500 mg/L)、多效唑(50、100、250、500、800 mg/L)和矮壮素(将50%矮壮素水剂分别稀释1 000、750、500、200、100倍)进行叶面喷施,测定不同处理下多年生黑麦草的株高、叶面积、叶长、叶宽、叶绿素含量、脯氨酸含量、根系活力等指标。结果表明:3种植物生长延缓剂均能不同程度地抑制多年生黑麦草株高、叶面积和叶长的增长,同时大幅增加脯氨酸含量和根系活力。多效唑对多年生黑麦草生长和生理特性的影响较乙烯利和矮壮素明显,且500 mg/L的多效唑在所有处理中效果最佳,是矮化草坪,提高草坪抗性的最佳延缓剂浓度。

Abstract:

In order to reveal the effects of plant growth retardant foliar sprays on the seedling growth and physiochemical characteristics of turfgrasses,different concentrations of ethephon (200,500,1 000,1 200,1 500 mg/L),paclobutrazol (50,100,250,500,800 mg/L),and chlormequat (chlormequat queous solution was diluted by 1 000,750,500,200 and 100 times respectively) were applied by foliar spraying on the perennial ryegrass seedlings,Lolium perenne, with cultivar of Shenshi,as tested material,and the effects of different treatments on plant height,leaf area,leaf length,leaf width,chlorophyll content,proline content,and root activity were analyzed.The results showed that three kinds of plant growth retardants inhibited the growth of plant height,leaf area and leaf length of perennial ryegrass,while the proline content and roots activity increased.However,the effect of paclobutrazol on the growth and physiological characteristics of perennial ryegrass was more significant than that of ethephon and chlormequat,and foliar spraying of paclobutrazol under concentration of 500 mg/L obtained the most optimal retardant effect for seedling dwarfing and lawn resistance to adverse environment.