Shading decreases plant carbon preferential allocation towards the most beneficial mycorrhizal mutualist.
Shading decreases plant carbon preferential allocation towards the most beneficial mycorrhizal mutualist.
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DOI：
10.1111/nph.13025
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Chaoyuan Zheng;B. Ji;Junling Zhang;Fusuo Zhang;J. Bever
中科院分区：
文献类型：
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作者：
Chaoyuan Zheng;B. Ji;Junling Zhang;Fusuo Zhang;J. Bever
向最有利的互惠者优先分配可以维持菌根互惠。优先分配的上下文依赖，然后可以确定丰富的菌根互惠的环境模式。我们评估的优先分配的碳（C）和差异磷（P）吸收在四个光处理之间的宿主植物葱vineale和两个丛枝菌根（AM）真菌分根系统。利用同位素标记法测定了有益和非有益AM真菌之间的碳分配和磷吸收的比率。在强光下，大蒜优先将更多的C分配给最有益的AM真菌感染的根系，反过来，从有益的真菌那里获得更多的P。优先分配随阴影的增加而下降，A. vineale分配25%的标记C的根感染有益的AM真菌在强光下，但只有15%的阴影，类似的百分比分配到根感染非有益的真菌，无论阴影。我们的研究结果表明，植物的优先分配对最有益的菌根互惠取决于地上资源，这表明，丰富的有益的菌根真菌将增加地上资源量，与菌根调解植物生产力与人为变化的影响。
Preferential allocation towards the most beneficial mutualist could maintain mycorrhizal mutualism. Context dependence of preferential allocation could then determine environmental patterns in abundance of mycorrhizal mutualists. We assessed the preferential allocation of carbon (C) and differential phosphorus (P) uptake across four light treatments between the host plant Allium vineale and two arbuscular mycorrhizal (AM) fungi within a split-root system. The ratios of C allocation and P uptake between the beneficial and nonbeneficial AM fungi were measured using isotopic labelling. Allium vineale preferentially allocated more C towards roots infected with the most beneficial AM fungus in high light and, in return, received more P from the beneficial fungus. Preferential allocation declined with shading, as A. vineale allocated 25% of labelled C to roots infected with beneficial AM fungi in high light, but only 15% with shading, a similar percentage to that allocated to roots infected with nonbeneficial fungi regardless of shading. Our findings demonstrate that plant preferential allocation towards the most beneficial mycorrhizal mutualist depends upon above-ground resources, suggesting that the abundance of beneficial mycorrhizal fungi will increase with amount of above-ground resources, with implications for mycorrhizal mediation of plant productivity with anthropogenic change.