干旱胁迫对接种AMF的香樟幼苗生物量分配及生长的影响

发布时间：2018-08-30 10:27

【摘要】：采用3种丛枝菌根真菌(Arbuscular mycorrhizal fungi,AMF)——幼套球囊霉(Glomus etunicatum,GE)、摩西球囊霉(Glomus mosseae,GM)和层状球囊霉(Glomus lamellosum,GL)分别对香樟(Cinnamomum camphora)种子单一接种、混合接种以及不接种(对照)处理,对90d大幼苗进行不同程度的干旱胁迫:正常供水(NW,土壤含水量为田间持水量的80%~90%)、轻度干旱胁迫(MW,土壤含水量为田间持水量的60%~70%)、中度干旱胁迫(MS,土壤含水量为田间持水量的56%~60%)、重度干旱胁迫(SS,土壤含水量为田间持水量的35%~40%);150d后对香樟生长指标进行测定。结果表明,在不同干旱胁迫下,除GM外接种AMF提高了香樟幼苗植株总生物量和抗旱性,而在SS条件下接种AMF显著促进了幼苗的生长(p0.05);在干旱胁迫下接种AMF通过影响植株的生长性状来影响植物的生物量分配;在干旱胁迫下,菌种差异通过影响叶面积来影响幼苗根、叶生物分配从而影响幼苗的总生物量积累和生长;在干旱胁迫下,菌种组合的方式则对幼苗生物量分配与生长均无显著影响;在喀斯特地区多种菌种共存不是以简单的叠加来发挥它们的影响效应,而是通过多种菌种应对不同的水分条件,发挥不同的抗旱效应来影响植物的生长性状,从而优化植物生物量的分配,维持植物在干旱生境下的生长。
[Abstract]:Three kinds of arbuscular mycorrhizal fungi (Arbuscular mycorrhizal fungi,AMF) -juvenile saccular fungi (Glomus etunicatum,GE), Glomus mosseae,GM and Glomus lamellosum,GL were used to inoculate the (Cinnamomum camphora) seeds of Cinnamomum camphora by single inoculation, mixed inoculation and non-inoculation (control), respectively. The normal water supply (NW, soil water content is 80% of field water holding capacity), mild drought stress (MW, soil moisture content is 600.70% of field water holding capacity) and moderate drought stress (MS, soil moisture content is field water content is field). The growth index of Cinnamomum camphora was measured 150 days after severe drought stress (SS, soil water content was 35 ~ 40% of field water holding capacity). The results showed that under different drought stress, the total biomass and drought resistance of Cinnamomum camphora seedlings were increased with the addition of AMF in addition to GM. Inoculation of AMF in SS significantly promoted seedling growth (p0.05), inoculated with AMF under drought stress affected plant biomass distribution by affecting plant growth traits, and strain difference affected seedling root by affecting leaf area under drought stress. Leaf biological distribution affected the total biomass accumulation and growth of seedlings, but the way of strain combination had no significant effect on seedling biomass allocation and growth under drought stress. The coexistence of many species in karst area is not a simple superposition to exert their effects, but to affect the growth of plants through different water conditions and drought resistance effects. In order to optimize the allocation of plant biomass and maintain plant growth in arid habitats.
【作者单位】：贵州大学林学院;贵阳市花溪区马铃乡林业站;
【基金】：国家自然基金(No.31000204;No.31360106) 贵州省农业攻关项目(黔科合NY[2014]3029号) 贵州省优秀青年科技人才专项基金(黔科合人字2013(10)) 贵州大学引进人才项目(No.2012-005)
【分类号】：Q948.122.3

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