Partner Choice in Nitrogen-Fixation Mutualisms of Legumes and Rhizobia1
Partner Choice in Nitrogen-Fixation Mutualisms of Legumes and Rhizobia1
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DOI：
10.1093/icb/42.2.369
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发表时间：
2002-04
期刊：
影响因子：
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通讯作者：
E. Simms;David G. Taylor
中科院分区：
文献类型：
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作者：
E. Simms;David G. Taylor
摘要互惠互动对许多生物来说是普遍的和必须的，但它们在欺骗面前的进化持久性在理论上是令人困惑的。植物和土壤微生物之间的养分获取共生关系对植物进化和生态系统功能至关重要，但我们对这些古老的共生关系的进化动力学和持久性机制几乎一无所知。伙伴选择和伙伴忠诚是对付骗子的机制，理论上可以让互惠持续下去，尽管骗子。许多合作行为的模型假设成对的相互作用，而大多数植物-微生物营养获取共生体涉及单个植物与许多微生物的相互作用。相反，市场模式非常适合互惠共生，在这种模式中，单个植物试图与多个个体进行互利的资源交换。市场模型假设一个合作伙伴选择与从潜在合作伙伴市场中选出的一部分人进行交易。因此，确定植物-微生物互惠关系中是否发生伙伴选择对于理解这些共生关系的进化持久性和动态至关重要。豆科植物和根瘤菌之间的固氮/固碳共生关系广泛、古老，对生态系统功能和人类营养非常重要。它还涉及单个植物同时与几个或多个细菌伴侣相互作用，包括无效（“欺骗”）菌株。我们回顾了现有的文献，发现这种互惠关系显示了合作伙伴选择的几个要素，并可能符合市场范式的要求。最后，我们确定有利可图的问题，为未来的研究。
Abstract Mutualistic interactions are widespread and obligatory for many organisms, yet their evolutionary persistence in the face of cheating is theoretically puzzling. Nutrient-acquisition symbioses between plants and soil microbes are critically important to plant evolution and ecosystem function, yet we know almost nothing about the evolutionary dynamics and mechanisms of persistence of these ancient mutualisms. Partner-choice and partner-fidelity are mechanisms for dealing with cheaters, and can theoretically allow mutualisms to persist despite cheaters. Many models of cooperative behavior assume pairwise interactions, while most plant-microbe nutrient-acquisition symbioses involve a single plant interacting with numerous microbes. Market models, in contrast, are well suited to mutualisms in which single plants attempt to conduct mutually beneficial resource exchange with multiple individuals. Market models assume that one partner chooses to trade with a subset of individuals selected from a market of potential partners. Hence, determining whether partner-choice occurs in plant-microbe mutualisms is critical to understanding the evolutionary persistence and dynamics of these symbioses. The nitrogen-fixation/carbon-fixation mutualism between leguminous plants and rhizobial bacteria is widespread, ancient, and important for ecosystem function and human nutrition. It also involves single plants interacting simultaneously with several to many bacterial partners, including ineffective (“cheating”) strains. We review the existing literature and find that this mutualism displays several elements of partner-choice, and may match the requirements of the market paradigm. We conclude by identifying profitable questions for future research.