Open AccessSimulation of legume-rhizobia symbiosis evolution under the multi-strain competition of bacteria for inoculation of symbiotic habitats
Author(s) -
N. I. Vorobyov,
Н. А. Проворов
Publication year - 2008
Publication title -
èkologičeskaâ genetika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.148
H-Index - 3
eISSN - 2411-9202
pISSN - 1811-0932
DOI - 10.17816/ecogen643-11
Subject(s) - rhizobia , biology , symbiosis , mutualism (biology) , rhizosphere , competition (biology) , symbiotic bacteria , population , experimental evolution , strain (injury) , root nodule , bacteria , legume , inoculation , botany , nitrogen fixation , ecology , horticulture , genetics , gene , demography , anatomy , sociology
The model is suggested for evolution of N 2 -fixing legume-rhizobia symbiosis implemented under the conditions of multi-strain bacteria competition for inoculation of symbiotic habitats (rhizosphere, nodules). Competitiveness of each strain is characterized by the power coefficients which reflect the operation of frequency-dependent selection in the rhizobia population. When polymorphic bacteria populations are interacting with the dimorphic plant population, the selective pressures in favor of hostspecific symbionts (forming N 2 -fixing nodules only with one of the available plant genotypes) are higher than the pressures in favor of non-host-specific symbionts (forming these nodules with both plant genotypes). The highest mutualism efficiency is reached under an intermediate level of plant population diversity.