Host investment into symbiosis varies among genotypes of the legume Acmispon strigosus, but host sanctions are uniform
Autor: | Joel L. Sachs, Kenjiro W. Quides, Amanda C. Hollowell, Kelsey A. Gano-Cohen, John U. Regus, Camille E. Wendlandt, Eunice S. Adinata, Jonathan Y. Lyu |
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Rok vydání: | 2018 |
Předmět: |
0106 biological sciences
0301 basic medicine Genotype Physiology mutualism legume-rhizobia Plant Biology & Botany Zoology Acmispon strigosus Plant Science 01 natural sciences Bradyrhizobium Rhizobia 03 medical and health sciences Symbiosis host sanctions genetic structure Mutualism (biology) Agricultural and Veterinary Sciences biology food and beverages Plant host control Biological Sciences biochemical phenomena metabolism and nutrition biology.organism_classification preferential allocation 030104 developmental biology Sympatric speciation Genetic structure Lotus Regression Analysis Root Nodules Root Nodules Plant 010606 plant biology & botany |
Zdroj: | The New phytologist, vol 221, iss 1 |
ISSN: | 1469-8137 |
Popis: | Efficient host control predicts the extirpation of ineffective symbionts, but they are nonetheless widespread in nature. We tested three hypotheses for the maintenance of symbiotic variation in rhizobia that associate with a native legume: partner mismatch between host and symbiont, such that symbiont effectiveness varies with host genotype; resource satiation, whereby extrinsic sources of nutrients relax host control; and variation in host control among host genotypes. We inoculated Acmispon strigosus from six populations with three Bradyrhizobium strains that vary in symbiotic effectiveness on sympatric hosts. We measured proxies of host and symbiont fitness in single- and co-inoculations under fertilization treatments of zero added nitrogen (N) and near-growth-saturating N. We examined two components of host control: 'host investment' into nodule size during single- and co-inoculations, and 'host sanctions' against less effective strains during co-inoculations. The Bradyrhizobium strains displayed conserved growth effects on hosts, and host control did not decline under experimental fertilization. Host sanctions were robust in all hosts, but host lines from different populations varied significantly in measures of host investment in both single- and co-inoculation experiments. Variation in host investment could promote variation in symbiotic effectiveness and prevent the extinction of ineffective Bradyrhizobium from natural populations. |
Databáze: | OpenAIRE |
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