紫花苜蓿根浸提液对3种牧草种子萌发过程的化感作用  

Allelopathic effects of root extracts from Medicago sativa on germination of three forage species

作　　者：朱亦朴 李玉萌 王占彬[1] 赵凌平[1] 赵芙蓉[1] ZHU Yipu;LI Yumeng;WANG Zhanbin;ZHAO Lingping;ZHAO Furong(College of Animal Science and Technology,Henan University of Science and Technology,Luoyang 471000,Henan,China)

机构地区：[1]河南科技大学动物科技学院,河南洛阳471000

出　　处：《草业科学》2023年第3期761-768,共8页Pratacultural Science

基　　金：青海省重点研发与转化计划(2019-NK-173);河南科技大学大学生研究训练计划SRTP(2021384)。

摘　　要：以紫花苜蓿(Medicago sativa)为供体植物,采用室内生物学测定法,研究不同浓度(0、2.5、5.0、10.0和20.0g·L^(-1))紫花苜蓿根浸提液对多年生黑麦草(Lolium perenne)、一年生黑麦草(L.multiflorum)和梯牧草(Phleum pratense)3种禾本科牧草种子萌发过程的化感作用,为探索合理的牧草混播方式提供理论依据。结果表明:在供试浓度范围内,不同浓度的紫花苜蓿根浸提液对3种禾本科牧草种子发芽率、发芽势、发芽指数、活力指数均有明显的抑制作用[化感效应指数(RI)<0],对根长和苗高有低浓度促进、高浓度抑制的作用。3种禾本科牧草对紫花苜蓿化感作用的相应有一定差异,在根浸提液的作用下,多年生黑麦草和一年生黑麦草的化感综合效应指数均为负值,表现为明显的抑制作用[化感综合效应指数(SE)<0];而梯牧草种子萌发生长呈低浓度促进、高浓度抑制趋势。研究结果表明,相较于多年生黑麦草和一年生黑麦草,梯牧草对紫花苜蓿化感抑制作用的适应性和抵抗能力更强,更适合与紫花苜蓿混播。To provide a theoretical basis for exploring reasonable planting models,we used a bioassay to evaluate the allelopathic effects of a range of concentrations(0,2.5,5.0,10.0,and 20.0 g·L^(-1))of root extracts from alfalfa(Medicago sativa)on seed germination of three important forage species:Lolium perenne,L.multiflorum,and Phleum pratense The results showed that within the tested concentration range,root extracts from alfalfa had a significant inhibitory effect on the germination rate,germination vigor,germination index,and vigor index(response index,RI<0).Furthermore,root extracts from alfalfa had a concentration effect on seedling height and root length of seedlings,that is,"low promotion and high inhibition."Some differences were observed in the responses to alfalfa allelopathy among the three grasses.The synthetical allelopathic index of L.perenne and L.multiflorum was negative under the action of root extract,which showed clear inhibitory effects(synthetical allelopathic index,SE<0).In conclusion,P.pratense has a stronger adaptability and resistance to the allelopathic inhibitory effect of alfalfa root extracts compared with L.perenne and L.multiflorum.Thus,P.pratense is more suitable for mixed sowing with alfalfa than L.perenne and L.multiflorum.

关 键 词：紫花苜蓿 浸提液 化感作用 多年生黑麦草 一年生黑麦草 梯牧草 

分 类 号：S541.9[农业科学—作物学] S543