莲草直胸跳甲和根结线虫共同危害对空心莲子草及莲子草生长的影响  

Joint herbivory of Agasicles hygrophila and Meloidogyne incognita on the growth of Alternanthera philoxeroides and Alternanthera sessilis

作　　者：覃海蓉 郭文锋[2] 阳莎 李晓琼[1] QIN Hairong;GUO Wenfeng;YANG Sha;LI Xiaoqiong(Forestry College,Guangxi University,Guangxi Key Laboratory of Forestry Ecology and Conservation,Nanning 530005,China;Guangxi Academy of Agricultural Sciences,Guangxi Crop Genetic Improvement and Biotechnology Laboratory,Nanning 530007,China)

机构地区：[1]广西大学林学院广西森林生态与保育重点实验室,广西南宁530005 [2]广西农科院广西作物遗传改良生物技术重点开放实验室,广西南宁530007

出　　处：《河南农业大学学报》2021年第5期890-895,共6页Journal of Henan Agricultural University

基　　金：国家自然科学基金项目(31800423);广西省自然科学青年基金项目(2018GXNSFBA281172)

摘　　要：以入侵植物空心莲子草(Alternanthera philoxeroides)及其本地同属种莲子草(Alternanthera sessilis)为研究对象,比较地上专食性天敌莲草直胸跳甲(Agasicles hygrophila)和南方根结线虫(Meloidogyne incognita)的单独或共同危害对2种植物生长性状和生物量分配的影响。结果表明,与无植食性生物危害相比,跳甲单独危害使空心莲子草的总生物量降低了约39.3%;线虫单独危害使空心莲子草的粗根数、细根数和莲子草的细根数分别增加了约2.5%、3.3%、1.5%;而在跳甲和线虫共同危害下,空心莲子草的地下生物量、分枝数和莲子草的分枝数均增加;但空心莲子草的茎长却降低了约49.3%,且比跳甲或线虫的单独危害作用更强。由此说明,根结线虫能增强莲草直胸跳甲对空心莲子草的生物防治效果。在地上-地下植食性生物的互作下,空心莲子草在根系和生物量分配方面比莲子草具有更强的表型可塑性。The invasive plant Alternanthera philoxeroides and its native congener Alternanthera sessilis were used as the studying objects to compare the single or joint herbivory of the specialist beetle Agasicles hygrophila and the root-knot nematode Meloidogyne incognita on the growth traits and biomass allocation of the two plants.The results showed that compared with those plants without herbivory,the total biomass of A.philoxeroides was reduced by about 39.3%with the beetle herbivory alone;The coarse roots and the fine roots of A.philoxeroides and the fine roots of A.sessilis were increased by about 2.5%,3.3%,and 1.5%,respectively,with nematode herbivory alone;the belowground biomass and the branch number of A.philoxeroides and the branch number of A.sessilis were conversely increased but the stolon length of A.philoxeroides was decreased by about 49.3%with joint herbivory by the beetle and the nematode,much stronger than herbivory by the beetle or the nematode alone.Thus,the nematode M.incognita could enhance the biological control efficiency of A.hygrophila on A.philoxeroides,Moreover,A.philoxeroides had stronger phenotypic plasticity in terms of root and biomass allocation compared to A.sessilis under above-and belowground herbivore interactions.

关 键 词：空心莲子草 莲子草 地上-地下天敌互作 生物入侵 生物防治 生物量 

分 类 号：S451.1[农业科学—植物保护]