Intimacy stabilizes symbiotic nodulation

James, Euan K.

doi:10.1038/s41477-023-01438-5

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…We propose that the lower nutrient soils (and several other stresses, such as seasonal drought) associated with savannahs and SDTF not only drove a reduction in growth habit, but also necessitated a greater dependency on a more reliable nodulating symbiosis, as the smaller root systems of shrub and subshrub Chamaecrista species have a reduced access to a much more limited pool of soil N compared to large rainforest- dwelling trees that also have a higher capacity to (re)cycle their N. Therefore, the shrub and subshrub Chamaecrista species have largely rejected the FT-type symbiosis of their arboreal cousins in the section Apoucouita , and have gradually adopted (via the intermediate FT-SYM-type nodule) the more intimate SYM-type nodule, which with its full incorporation of the bacteroids into the host cytoplasm exhibits the compartmentalization that is linked with more stable and efficient symbioses (Parniske, 2018; Chomicki et al 2020; Faria et al 2022; Libourel et al 2023; James 2023; Mohd-Radzman & Drapek, 2023). In this respect, the FT versus SYM pattern revealed by the present study across the highly speciose genus Chamaecrista mirrors that across the Caesalpinioideae subfamily as a whole i.e.…”

Section: Discussionmentioning

confidence: 99%

The radiation of nodulatedChamaecristaspecies from the rainforest into more diverse habitats has been accompanied by a reduction in growth form and a shift from fixation threads to symbiosomes

Casaes,

Ferreira dos Santos,

Silva

et al. 2023

Preprint

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All non-mimosoid nodulated genera in the legume subfamily Caesalpinioideae confine their rhizobial symbionts within cell wall-bound “fixation threads” (FTs). The exception is the large genusChamaecristain which shrubs and subshrubs house their rhizobial bacteroids more intimately within symbiosomes, whereas large trees have FTs. This study aimed to unravel the evolutionary relationships betweenChamaecristagrowth habit, habitat, nodule bacteroid type, and rhizobial genotype. The growth habit, bacteroid anatomy, and rhizobial symbionts of 30 nodulatedChamaecristaspecies native to different biomes in the Brazilian state of Bahia, a major centre of diversity for the genus, was plotted onto an ITS-TrnL-F-derived phylogeny ofChamaecrista. The bacteroids from most of theChamaecristaspecies examined were enclosed in symbiosomes (SYM-type nodules), but those in arborescent species in the sectionApoucouita, at the base of the genus, were enclosed in cell wall material containing homogalacturonan (HG) and cellulose (FT-type nodules). Most symbionts wereBradyrhizobiumgenotypes grouped according to the growth habits of their hosts, but the tree,C. eitenorum,was nodulated byParaburkholderia.Chamaecristahas a range of growth habits that allow it to occupy several different biomes and to co-evolve with a wide range of (mainly) bradyrhizobial symbionts. FTs represent a less intimate symbiosis linked with nodulation losses, so the evolution of SYM-type nodules by mostChamaecristaspecies may have (a) aided the genus-wide retention of nodulation, and (b) assisted in its rapid speciation and radiation out of the rainforest into more diverse and challenging habitats.

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Section: Discussionmentioning

confidence: 99%

The radiation of nodulatedChamaecristaspecies from the rainforest into more diverse habitats has been accompanied by a reduction in growth form and a shift from fixation threads to symbiosomes

Casaes,

Ferreira dos Santos,

Silva

et al. 2023

Preprint

Self Cite

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Is it possible to engineer nitrogen fixing nodule symbiosis?

Yan,

Bisseling

2024

Agriculture Communications

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The radiation of nodulated Chamaecrista species from the rainforest into more diverse habitats has been accompanied by a reduction in growth form and a shift from fixation threads to symbiosomes

Casaes,

Ferreira dos Santos,

Silva

et al. 2024

Journal of Experimental Botany

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All non-mimosoid nodulated genera in the legume subfamily Caesalpinioideae confine their rhizobial symbionts within cell wall-bound “fixation threads” (FTs). The exception is the large genus Chamaecrista in which shrubs and subshrubs house their rhizobial bacteroids more intimately within symbiosomes, whereas large trees have FTs. This study aimed to unravel the evolutionary relationships between Chamaecrista growth habit, habitat, nodule bacteroid type, and rhizobial genotype. The growth habit, bacteroid anatomy, and rhizobial symbionts of 30 nodulated Chamaecrista species native to different biomes in the Brazilian state of Bahia, a major centre of diversity for the genus, was plotted onto an ITS-TrnL-F-derived phylogeny of Chamaecrista. The bacteroids from most of the Chamaecrista species examined were enclosed in symbiosomes (SYM-type nodules), but those in arborescent species in the section Apoucouita, at the base of the genus, were enclosed in cell wall material containing homogalacturonan (HG) and cellulose (FT-type nodules). Most symbionts were Bradyrhizobium genotypes grouped according to the growth habits of their hosts, but the tree, C. eitenorum, was nodulated by Paraburkholderia. Chamaecrista has a range of growth habits that allow it to occupy several different biomes and to co-evolve with a wide range of (mainly) bradyrhizobial symbionts. FTs represent a less intimate symbiosis linked with nodulation losses, so the evolution of SYM-type nodules by most Chamaecrista species may have (a) aided the genus-wide retention of nodulation, and (b) assisted in its rapid speciation and radiation out of the rainforest into more diverse and challenging habitats.

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Intimacy stabilizes symbiotic nodulation

Cited by 3 publications

References 12 publications

The radiation of nodulatedChamaecristaspecies from the rainforest into more diverse habitats has been accompanied by a reduction in growth form and a shift from fixation threads to symbiosomes

The radiation of nodulatedChamaecristaspecies from the rainforest into more diverse habitats has been accompanied by a reduction in growth form and a shift from fixation threads to symbiosomes

Is it possible to engineer nitrogen fixing nodule symbiosis?

The radiation of nodulated Chamaecrista species from the rainforest into more diverse habitats has been accompanied by a reduction in growth form and a shift from fixation threads to symbiosomes

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