Preferential allocation of benefits and resource competition among recipients allows coexistence of symbionts within hosts
Preferential allocation of benefits and resource competition among recipients allows coexistence of symbionts within hosts
复制标题
受益者之间利益的优先分配和资源竞争允许宿主内共生体共存
DOI：
10.1086/718643
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Bever, James D.
中科院分区：
文献类型：
--
作者：
Ghosh, Shyamolina;Reuman, Daniel;Bever, James D.
功能可变的共生体通常共生，包括在单个植物的根内，尽管互惠共生的稳定性的简单模型预测了共生体之间的竞争排斥。我们通过评估共生体对植物资源的竞争所产生的动态以及植物对最有益的共生体的优先分配来探索这一悖论，所使用的微分方程组表示互惠和非互惠共生体的密度以及共生体竞争的优先分配和非优先分配的资源的水平。我们发现，宿主的优先分配和互惠的成本产生了资源专门化，使有益和非有益的共生体共存成为可能。此外，由于寄主优先分配中的负生理反馈，使共存成为可能。我们发现，植物生理学和共生体竞争的生物现实模型预测，有益共生体和非有益共生体的共存在根共生体中应该是常见的，互惠共生体的密度和相对丰度应该随着宿主的需要而成比例地增加。
Functionally variable symbionts commonly co-occur including within the roots of individual plants, in spite of arguments from simple models of the stability of mutualism that predict competitive exclusion among symbionts. We explore this paradox by evaluating the dynamics generated by symbiont competition for plant resources and the plant’s preferential allocation to the most beneficial symbiont using a system of differential equations representing the densities of mutualistic and nonmutualistic symbionts and the level of preferentially allocated and nonpreferentially allocated resources for which the symbionts compete. We find that host preferential allocation and costs of mutualism generate resource specialization that makes the coexistence of beneficial and nonbeneficial symbionts possible. Furthermore, coexistence becomes likely because of negative physiological feedbacks in host preferential allocation. We find that biologically realistic models of plant physiology and symbiont competition predict that the coexistence of beneficial and nonbeneficial symbionts should be common in root symbioses and that the density and relative abundance of mutualists should increase in proportion to the needs of the host.