Preferential allocation, physio-evolutionary feedbacks, and the stability and environmental patterns of mutualism between plants and their root symbionts
Preferential allocation, physio-evolutionary feedbacks, and the stability and environmental patterns of mutualism between plants and their root symbionts
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DOI：
10.1111/nph.13239
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发表时间：
2015-03-01
期刊：
影响因子：
9.4
通讯作者：
Bever, James D.
中科院分区：
文献类型：
--
作者：
Bever, James D.
植物和根共生体之间互惠互利的相互作用是常见的问题。由于向宿主提供益处涉及共生体的成本，因此预期向其宿主提供减少的益处的共生体的频率会增加。植物对最有效的共生体具有优先分配的特性，这种优先分配可以稳定共生关系。本文构建了一个寄主优先分配的交互反馈和根系共生体种群动态的一般模型，以评价营养互惠的稳定性。优先分配可以促进共生的进化，即使共生体的成本是非常大的。此外，优先分配的生理可塑性可能导致有益和非有益共生体的共存。对于丛枝菌根真菌，促进植物吸收磷（P），该模型预测更大的P转移从这些真菌每单位碳投资与土壤P浓度的降低和大气CO2浓度的增加，已在实验室和田间研究中观察到的模式。这个框架将植物分配的生理可塑性与确定互利共生稳定性的种群过程联系起来，因此，代表了理解互利共生稳定性和环境模式的重要一步。
The common occurrence of mutualistic interactions between plants and root symbionts is problematic. As the delivery of benefit to hosts involves costs to symbionts, symbionts that provide reduced benefit to their host are expected to increase in frequency. Plants have been shown to allocate preferentially to the most efficient symbiont and this preferential allocation may stabilize the mutualism. I construct a general model of the interactive feedbacks of host preferential allocation and the dynamics of root symbiont populations to evaluate the stability of nutritional mutualisms. Preferential allocation can promote the evolution of mutualism even when the cost to the symbiont is very large. Moreover, the physiological plasticity of preferential allocation likely leads to coexistence of beneficial and nonbeneficial symbionts. For arbuscular mycorrhizal fungi, which facilitate plant uptake of phosphorus (P), the model predicts greater P transfer from these fungi per unit carbon invested with decreasing concentrations of soil P and with increasing concentrations of atmospheric CO2, patterns that have been observed in laboratory and field studies. This framework connects physiological plasticity in plant allocation to population processes that determine mutualism stability and, as such, represents a significant step in understanding the stability and environmental patterns in mutualism.