Simulation of legume-rhizobia symbiosis evolution under the multi-strain competition of bacteria for inoculation of symbiotic habitats

Vorobyov, N. I.; Проворов, Н. А.

doi:10.17816/ecogen643-11

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…Участие ГПГ в эволюции ризобий подтверждается локализацией sym-генов на мобильных генетических элементах (плазмиды или хромосомные островки, ограниченные IS-подобными элементами), а также характерной для них панмиктической структурой популяций [24]. Широкая экспансия sym-генов в ассоциированных с растениями бактериальных сообществах посредством ГПГ, как считается, является наиболее вероятным способом формирования современного разнообразия ризобий и проявляется в различиях филогении симбиотических генов и генов «домашнего хозяйства» [14,25]. Поэтому анализ симбиотических генов является неотъемлемой частью работы по исследованию разнообразия клубеньковых бактерий.…”

Section: опыты по перекрестной инокуляцииunclassified

Phylogenetic characteristic of nodul bacteria endemic for Southern Ural species of the genus Oxytropis (fabaceae)

Baymiev

Ханифович²,

Vladimirova

et al. 2020

Ecological genetics

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Background An analysis of the spatial distribution of some taxonomically and ecologically related legumes in the Ural showed a nontrivial spatial distribution of related species of the genus Oxytropis DC of the Orobia Bunge section within the Uchalinsky uplands. Despite the similarities in ecology, these species practically do not grow together. Explicit spatial segregation of closely related plants over a relatively small area allows this phenomenon to be used as a convenient model for studying the effect of segregation of closely related legume species on the genetic composition of their nodule bacteria. Materials and methods The genetic diversity of nodule bacteria entering into symbiosis with O. kungurensis, O. baschkiriensis, O. approximata and O. gmelinii plants was studied. In addition, the polymorphism of their symbiotic genes has also been analyzed. Results Phylogenetic characteristics of nodule bacteria endemic for the Southern Ural belonging to 4 species of leguminous plants of the genus Oxytropis of the section Orobia: O. kungurensis, O. baschkiriensis, O. approximata, O. gmelinii which are characterized by spatial separation of the growth sites, also called plant segregation, are given. It was shown that all of them belong to the genus Mesorhizobium despite certain phylogenetic differences of bacteria. Analysis of the symbiotic genes of the analyzed strains revealed a lack of congruence of their phylogeny with the core part of the genome. It was found that the microsymbionts of O. baschkiriensis plants differ in the phylogeny of nod-genes from nodule bacteria of other plants of the Oxytropis genus and are close to microsymbionts of plants of the Lupinaster genus growing in the Southern Urals. Conclusion Acquisition of the property to enter into symbiosis with nodule bacteria of plants of the genus Lupinaster may turn out to be an adaptive mechanism that arose as a result of segregation of O. baschkiriensis from other species of Oxytropis

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Section: опыты по перекрестной инокуляцииunclassified

Phylogenetic characteristic of nodul bacteria endemic for Southern Ural species of the genus Oxytropis (fabaceae)

Baymiev

Ханифович²,

Vladimirova

et al. 2020

Ecological genetics

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“…This difference is in a good agreement with the coordinated increases of the ecological efficiency and symbiotic specificity revealed in the mutualism evolution (see ''Introduction'') and therefore it would be very attractive to reveal the selective mechanisms responsible for the ''specificity-efficiency'' trade-off. In order to dissect these mechanisms we developed the mathematical description for multi-strain rhizobia competition (Vorobyov and Provorov 2008; see footnote to Table 1) which allows us to compare the performance of different mutualist types in one computer experiment. We analyzed the evolution of symbiotic systems composed of a dimorphic plant population (genotypes G1 and G2) and of a rhizobia population polymorphic for the symbiotic specificity.…”

Section: Co-evolutionary Models For the Mutualistic Symbiosismentioning

confidence: 99%

“…In the control computer experiments (MathCad 2000, MathCad X3) For simulating the plant co-evolution with a symbiotically polymorphous bacterial population composed of J [ 2 strains we described the competitive processes using the system of J equations (Vorobyov and Provorov 2008):…”

Section: Partners' Feedbacksmentioning

confidence: 99%

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Host plant as an organizer of microbial evolution in the beneficial symbioses

Проворов

Vorobyov

2009

Phytochem Rev

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Evolution of beneficial plant-microbe symbioses is presented as a result of selective processes induced by hosts in the associated microbial populations. These processes ensure a success of ''genuine mutualists'' (which benefit the host, often at the expense of their own fitness) in competition with ''symbiotic cheaters'' (which consume the resources provided by host without expressing the beneficial traits). Using a mathematical model describing the cyclic microevolution of rhizobia-legume symbiosis, we suggest that the selective pressures in favor of N 2 -fixing (Fix ? ) strains operate within the in planta bacterial population due to preferential allocation of C resources into Fix ? nodules (positive partners' feedbacks). Under the clonal infection of nodules, Fix ? strains (''genuine mutualists'') are supported by the group (inter-deme, kin) selection while under the mixed infections, this selection is ineffective since the Fix ? strains are over-competed by Fix -ones (''symbiotic cheaters'') in the nodular habitats. Nevertheless, under mixed infections, Fix ? strains may be supported due to the coevolutionary responses form plant population which induce the mutualism-specific types of natural (group, individual) selection including the frequency dependent selection implemented in rhizobia population during the competition for host infection. Using the model of multi-strain bacterial competition for inoculation of symbiotic (rhizospheric, nodular) habitats, we demonstrate that the individual selection in favor of host-specific mutualist genotypes is more intensive than in favor of non-host-specific genotypes correlating the experimental data on the coordinated increases of symbiotic efficiency and specificity in the rhizobia-legume coevolution. However, an overall efficiency of symbiotic system is maximal when the non-host-specific mutualists are present in rhizobia population, and selection in favor of these mutualists operating at the whole population level is of key importance for improving the symbiosis. Construction of the agronomically valuable plantmicrobe systems should provide the optimization of host-specific versus non-host-specific mutualists' composition in legume inoculants combined with the clonal penetration of these mutualists into the nodules.

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Evolution of legume-rhizobium symbiosis for an improved ecological efficiency and genotypic specificity of partner interactions

Проворов

Vorobyov

2011

Russ J Genet

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Simulation of legume-rhizobia symbiosis evolution under the multi-strain competition of bacteria for inoculation of symbiotic habitats

Cited by 8 publications

References 18 publications

Phylogenetic characteristic of nodul bacteria endemic for Southern Ural species of the genus Oxytropis (fabaceae)

Phylogenetic characteristic of nodul bacteria endemic for Southern Ural species of the genus Oxytropis (fabaceae)

Host plant as an organizer of microbial evolution in the beneficial symbioses

Evolution of legume-rhizobium symbiosis for an improved ecological efficiency and genotypic specificity of partner interactions

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