摘要
试验旨在探究密胡杨水浸液对受体植物种子萌发的化感效应以及对叶绿素含量、干重、鲜重、株高的影响.以密胡杨为供体材料,以布顿大麦和鸭茅为受体材料,采用水提法制备密胡杨根、茎、叶水浸液(0.020、0.035、0.050 g/mL),以无菌蒸馏水为对照(CK).结果显示:密胡杨水浸液对受体植物种子萌发和幼苗生长均有抑制作用,密胡杨水浸液显著抑制这两种禾草的发芽率、生物量(干重、鲜重)、株高以及叶绿素含量(P<0.05),随着浸提液浓度增加,其对受体种子的发芽率、胚根长和胚芽长抑制作用加强.研究表明,密胡杨水浸液对鸭茅种子萌发的抑制作用最强,而对含内生真菌的布顿大麦最弱.因此,含内生真菌的布顿大麦更适合于生长在密胡杨林周围.
Abstract
The aim of the experiment was to investigate the allelopathic effect of aqueous extracts of Populus talassica×P.euphratica on seed germination of recipient plants as well as its effect on chlorophyll content,dry weight,fresh weight and plant height.Aqueous extracts of roots,stems and leaves(0.020,0.035,0.050 g/mL)were prepared by aqueous extraction method,using Populus talassica×P.euphratica as the donor material and Hordeum bogdanii and Dactylis glomerata L.as the recipient materials,with sterile distilled water as the control(CK).The results showed that the Populus talassica×P.euphratica aqueous extracts inhibited both seed germination and seedling growth of the recipient plants,significantly inhibited the germination rate,biomass(dry and fresh weight),plant height and chlorophyll content of these two grasses(P<0.05),and with the increase of the concentration of the aqueous extracts,its inhibitory effect on germination rate of the recipient seeds,radicle length and embryo length was strengthened.The study indicates that,Populus talassica×P.euphratica extract had the strongest inhibitory effect on Dactylis glomerata L.seed germination,while it was the weakest on Hordeum bogdanii with endophytic fungi.Therefore,Hordeum bogdanii with endophytic fungi is more suitable for growing around dense Populus talassica×P.euphratica forests.
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