除草剂对高羊茅和马蹄金种子萌发及幼苗生理特性的影响

Effects of herbicides on seed germination and seedling physiological characteristics of Festuca arundinacea and Dichondra repens

以高羊茅(Festuca arundinacea)与马蹄金(Dichondra repens)为试验材料,分别采用浸种与叶面喷雾的处理方式,研究了不同浓度的草甘膦与2,4-D丁酯对两种草坪草种子萌发及幼苗生长的影响。结果显示,草甘膦总体抑制高羊茅和马蹄金的种子萌发,随浓度升高抑制作用增强,同时显著降低两种草坪草幼苗的苗高与根长(P<0.05);喷施2,4-D丁酯对两种草坪草各项生理指标的影响基本一致,随除草剂处理浓度与处理时间的增加,丙二醛(malondialdehyde,MDA)和脯氨酸(proline,Pro)含量增加,叶绿素含量和超氧化物歧化酶(superoxide dismutase,SOD)活性下降。研究表明,草甘膦对高羊茅和马蹄金的种子萌发与幼苗生长有显著的不利影响(P<0.05),2,4-D丁酯影响马蹄金幼苗的生理特性,同时对禾本科草坪草高羊茅也具有一定的抑制作用。

The effects of glyphosate and 2,4-D butylate on the seed germination and seedling growth of Festuca arundinacea and Dichondra repens were researched using seed soaking and leaf spraying,respectively.Generally,the germination rates of Festuca arundinacea and Dichondra repens were inhibited by glyphosate,and the effects intensified with the increase in concentration.Both the shoot height and root length of the two kinds of turfgrass seedlings were also significantly reduced by glyphosate(P<0.05).The responses of the physiological indices of two kinds of turfgrass to 2,4-D butylate were basically the same.With the increasing extent and duration of 2,4-D butylate stress,the malondialdehyde(MDA)and proline content of seedling leaves increased,whereas both the activity of superoxide dismutase(SOD)and chlorophyll content declined.This study highlights that glyphosate highly inhibited the germination rate and seedling growth of two kinds of turfgrass,and 2,4-D butylate affected the physiological characteristics of D.repens seedlings negatively as well as those of F.arundinacea.