Toward Unifying Evolutionary Ecology and Genomics to Understand Positive Plant–Plant Interactions Within Wild Species

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Subrahmaniam, Harihar Jaishree | Roby, Dominique | Roux, Fabrice

Edité par CCSD ; Frontiers -

International audience. In a local environment, plant networks include interactions among individuals of differentspecies and among genotypes of the same species. While interspecific interactionsare recognized as main drivers of plant community patterns, intraspecific interactionshave recently gained attention in explaining plant community dynamics. However, anoverview of intraspecific genotype-by-genotype interaction patterns within wild plantspecies is still missing. From the literature, we identified 91 experiments that were mainlydesigned to investigate the presence of positive interactions based on two contrastinghypotheses. Kin selection theory predicts partisan help given to a genealogicalrelative. The rationale behind this hypothesis relies on kin/non-kin recognition, with thepositive outcome of kin cooperation substantiating it. On the other hand, the elbowroomhypothesis supports intraspecific niche partitioning leading to positive outcomewhen genetically distant genotypes interact. Positive diversity-productivity relationshiprationalizes this hypothesis, notably with the outcome of overyielding. We found thatboth these hypotheses have been highly supported in experimental studies despite theiropposite predictions between the extent of genetic relatedness among neighbors andthe level of positive interactions. Interestingly, we identified a highly significant effect ofbreeding system, with a high proportion of selfing species associated with the presenceof kin cooperation. Nonetheless, we identified several shortcomings regardless of thespecies considered, such as the lack of a reliable estimate of genetic relatednessamong genotypes and ecological characterization of the natural habitats from whichgenotypes were collected, thereby impeding the identification of selective drivers ofpositive interactions.We therefore propose a framework combining evolutionary ecologyand genomics to establish the eco-genomic landscape of positive GxG interactions inwild plant species.

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