宿主植物的栽培密度对AM真菌孢子产量的影响
Influence of Host Planting Density on Sporulation of Arbuscular Mycorrhizal Fungi
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摘要: 对宿主植物的栽培密度与孢子产量的相关性进行了试验研究.以百喜草Paspalum notatum为宿主,每盆栽1、5或10株,以稍长无梗囊霉Acaulospora longula为供试菌株.植株生长4个月,结果发现1株/盆的侵染率显著高于其他2个栽培密度,但是三者的泡囊和丛枝的百分率没有差异.3种栽培密度下每盆植株的地上部生物量没有差异,但根系生物量随着栽培密度的增加而降低,土壤中的孢子密度也具有同样的趋势.相关分析发现,孢子密度与根系生物量密切相关.试验结果表明,宿主植物的高密度栽培可能导致分配到根系碳水化合物减少,从而减少AM真菌的孢子产量.Abstract: The relationship between host planting density and sporulation of arbuscular mycorrhizal(AM) fungi was investigated.Acaulospora longula were inoculated into bahia grass pots with 1,5 or 10 plants.After 4 months growth,the AM colonization were much higher in pots with 1 plant than that in pots with 5 or 10 plants,but no difference in the vesicle percentage and arbuscle percentage was observed.Although the shoot biomass didn't vary between 3 planting densities,the root biomass and spore density decreased with the increasing of planting density.Correlation analysis revealed a close relationship between root biomass and spore density.The result suggests that high planting density probably reduces the carbohydrate partitioned to the roots,and further retards the sporulation.
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Keywords:
- host plants /
- AM fungi /
- planting density /
- sporulation
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