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外接AM真菌与施磷对毛红椿幼苗生长适应性的影响

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为研究施用AM真菌(AMF)与磷对毛红椿幼苗生长、生理的影响,本文采用双因素盆栽实验,将幼苗分为接菌(AMF)和不接菌(Non-AMF)2组,分别进行不同磷浓度处理(P0:0 mmol-L,P1:1 mmol·L-1,P2:2 mmol·L-1),测定毛红椿根系侵染率、幼苗生长状况、生物量、养分、叶绿素荧光参数、可溶性蛋白、抗氧化酶等指标.根系菌根侵染率表现为AMF×P1高于AMF×P0和AMF×P2,220 d(生长Ⅱ期)毛红椿幼苗高于120 d(生长Ⅰ期)幼苗.在生长Ⅰ期,与未接菌相比,AMF×P1和AMF×P2促进了毛红椿幼苗的株高、地径、复叶数、总根长、根表面积及磷、钾的吸收量,而AMF×P0则无明显变化;在生长Ⅱ期,Non-AMF×P2幼苗的生长指标、生物量及氮磷钾的吸收能力接近于AMF×P1和AMF×P2.相较于未接菌处理,接种AM真菌显著增强了生长Ⅰ期毛红椿幼苗的Fv/F0和Fv/Fm,而未接菌且未施磷的幼苗其F0最高,Fv/Fm和Fv/F0最低.综上所述,一定的磷浓度与AM真菌相结合可以弥补缺磷引起的生长抑制,能显著促进毛红椿幼苗的生长,且AM真菌与磷互作对幼苗的促生效应要早于单纯的施用较高浓度磷.
Effect of arbuscular mycorrhizal fungi and phosphorus application on the adaptability of Toona ciliata var.pubescens seedlings
The effects of AM fungi and phosphorus on the growth and physiology of Toona ciliata var.pu-bescens seedlings were studied.Using two-factor pot experiment,the seedlings were divided into inoculat-ed(AMF)and non-inoculated(Non-AMF)groups,and treated with different phosphorus concentrations(P0:0 mmol·L-1,P1:1 mmol·L-1,P2:2 mmol·L-1),respectively.The root infection rate,seedling growth,bio-mass,nutrients,chlorophyll fluorescence parameters,soluble proteins,and antioxidant enzymes were measured.The root mycorrhizal infection rate showed that AMF×P1 was higher than AMF×P0 and AM-F×P2,and 220 d seedlings(growth stage Ⅱ)was higher than 120 d seedlings(growth stage Ⅰ).In growth stage Ⅰ,compared to Non-AMF,AMF×P1 and AMF×P2 promoted the plant height,diameter,number of compound leaves,total root length,root surface area,and phosphorus and potassium uptake of seedlings,while AMF×P0 showed no significant change.In growth stage Ⅱ,the growth indicators,biomass,and nitro-gen,phosphorus,and potassium absorption capacity of Non-AMF×P2 were similar to those of AMF×P1 and AMF×P2.Compared to the Non-AMF,inoculation with AM fungi significantly enhanced Fv/F0 and Fv/Fm in the growth stage Ⅰ seedlings,while seedlings of Non-AMF×P0 had the highest F0,and the lowest Fv/F0 and Fv/Fm.In summary,a certain concentration of phosphorus combined with AMF can compensate for the growth inhibition caused by phosphorus deficiency,and the interaction between AMF and phosphorus shows a pro-moting effect on seedling growth earlier than simply applying higher concentrations of phosphorus.

arbuscular mycorrhiza fungiToona ciliata var.pubescensphosphorus applicationinteractiongrowth adaptability

冉芳、赵明、阳先波、刘玮、王琼、姜雪茹

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江西农业大学园林与艺术学院,南昌 330045

AM真菌 毛红椿 施磷 互作 生长适应性

国家自然科学基金江西省林业科技创新专项江西省自然科学基金江西省教育厅项目

31960302创新专项[2019]25号20212BAB-215014GJJ200446

2024

植物生理学报
中国植物生理学会,中国科学院上海生命科学研究院植物生理生态研究所

植物生理学报

CSTPCD北大核心
影响因子:1.532
ISSN:2095-1108
年,卷(期):2024.60(1)
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