Genotypic variation in maize (<i>Zea mays</i>) influences rates of soil organic matter mineralization and gross nitrification

Mwafulirwa, Lumbani; Paterson, Eric; Cairns, Jill E.; Daniell, Tim J.; Thierfelder, Christian; Baggs, Elizabeth M.

doi:10.1111/nph.17537

Cited by 20 publications

(16 citation statements)

References 63 publications

(109 reference statements)

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“…Variation in SOM mineralization rates under plants is usually attributed to rhizosphere priming effects, where the exudation of organic compounds and root turnover affects microbial activity and use of SOM as substrate (Kuzyakov et al 2000). While factors such as root physical impacts on soil structure, nutrient and water availabilities may also affect microbial activity, our results are consistent with differential priming impacts among inbred lines (Mwafulirwa et al 2021). Increasing root diameter is commonly associated with increased rates of exudation, resulting from greater photo assimilate supply to thicker roots (Han et al 2020;Zai et al 2021).…”

Section: Study (Gwas)supporting

confidence: 85%

“…SBM and RBM were determined based on harvest dry weight (V3 growth stage) at 29 days after planting (shoots were cut at the soil surface and roots were carefully removed from the soil and washed in deionized water). Fresh roots were scanned, and root length and average root diameter measured using WINrhizo (Mwafulirwa et al 2021). To explore the plant traits that could significantly explain the variation in SOM-C mineralization, correlation and stepwise multiple linear regression (SMLR) analyses were conducted for all genotypes (lines and hybrids) and for lines or hybrids separately.…”

Section: Study (Gwas)mentioning

confidence: 99%

“…To explore the plant traits that could significantly explain the variation in SOM-C mineralization, correlation and stepwise multiple linear regression (SMLR) analyses were conducted for all genotypes (lines and hybrids) and for lines or hybrids separately. Further details of plant growth conditions, 13 C-CO2 labelling, measurements and phenotypic data are provided in Mwafulirwa et al (2021) and supplementary materials. Details of genotyping of materials and methodology of genome-wide association study (GWAS) and genomic selection (GS) are provided in the supplementary materials.…”

Section: Study (Gwas)mentioning

confidence: 99%

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Evidence of a plant genetic basis for maize roots impacting soil organic matter mineralization

Gowda

Cairns²,

Mwafulirwa

et al. 2021

Soil Biology and Biochemistry

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Section: Study (Gwas)supporting

confidence: 85%

Section: Study (Gwas)mentioning

confidence: 99%

Section: Study (Gwas)mentioning

confidence: 99%

See 1 more Smart Citation

Evidence of a plant genetic basis for maize roots impacting soil organic matter mineralization

Gowda

Cairns²,

Mwafulirwa

et al. 2021

Soil Biology and Biochemistry

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“…Indeed, it is known that the growth of plants can alter (via rhizodeposition) this microbially mediated SOM decomposition to varying extents (e.g. Cheng et al 2003;Mwafulirwa et al 2016Mwafulirwa et al , 2021, with increases of up to 380% relative to unplanted soil reported by Cheng et al (2003).…”

Section: Introductionmentioning

confidence: 99%

Identification of barley genetic regions influencing plant–microbe interactions and carbon cycling in soil

et al. 2021

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Purpose Rhizodeposition shapes soil microbial communities that perform important processes such as soil C mineralization, but we have limited understanding of the plant genetic regions influencing soil microbes. Here, barley chromosome regions affecting soil microbial biomass-C (MBC), dissolved organic-C (DOC) and root biomass were characterised. Methods A quantitative trait loci analysis approach was applied to identify barley chromosome regions affecting soil MBC, soil DOC and root biomass. This was done using barley Recombinant Chromosome Substitution Lines (RCSLs) developed with a wild accession (Caesarea 26-24) as a donor parent and an elite cultivar (Harrington) as recipient parent. Results Significant differences in root-derived MBC and DOC and root biomass among these RCSLs were observed. Analysis of variance using single nucleotide polymorphisms genotype classes revealed 16 chromosome regions influencing root-derived MBC and DOC. Of these chromosome regions, five on chromosomes 2H, 3H and 7H were highly significant and two on chromosome 3H influenced both root-derived MBC and DOC. Potential candidate genes influencing root-derived MBC and DOC concentrations in soil were identified. Conclusion The present findings provide new insights into the barley genetic influence on soil microbial communities. Further work to verify these barley chromosome regions and candidate genes could promote marker assisted selection and breeding of barley varieties that are able to more effectively shape soil microbes and soil processes via rhizodeposition, supporting sustainable crop production systems.

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“…For example, greater mass of mucilage exuded by chickpea roots were linked with the formation of larger and more porous rhizosheaths capable of storing more soil moisture in drought tolerant cultivars 27 . In annual crops such as wheat, barley and maize, there is evidence of the remarkable plant genetic influence in the formation of rhizosheath and the processes of rhizodeposition influencing rhizosphere microbial activities 18 , 28 – 30 , however few studies have aimed to dissect the genetics underlying the conformation of this extended root phenotype 18 , 28 , 31 , 32 .…”

Section: Introductionmentioning

confidence: 99%

Genetic control of rhizosheath formation in pearl millet

Cantó

Diouf

Ndour

et al. 2022

Sci Rep

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The rhizosheath, the layer of soil that adheres strongly to roots, influences water and nutrients acquisition. Pearl millet is a cereal crop that plays a major role for food security in arid regions of sub-Saharan Africa and India. We previously showed that root-adhering soil mass is a heritable trait in pearl millet and that it correlates with changes in rhizosphere microbiota structure and functions. Here, we studied the correlation between root-adhering soil mass and root hair development, root architecture, and symbiosis with arbuscular mycorrhizal fungi and we analysed the genetic control of this trait using genome wide association (GWAS) combined with bulk segregant analysis and gene expression studies. Root-adhering soil mass was weakly correlated only to root hairs traits in pearl millet. Twelve QTLs for rhizosheath formation were identified by GWAS. Bulk segregant analysis on a biparental population validated five of these QTLs. Combining genetics with a comparison of global gene expression in the root tip of contrasted inbred lines revealed candidate genes that might control rhizosheath formation in pearl millet. Our study indicates that rhizosheath formation is under complex genetic control in pearl millet and suggests that it is mainly regulated by root exudation.

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Genotypic variation in maize (Zea mays) influences rates of soil organic matter mineralization and gross nitrification

Abstract: Genotypic variation in maize (Zea mays) influences rates of soil organic matter mineralisation and gross nitrification

Cited by 20 publications

References 63 publications

Evidence of a plant genetic basis for maize roots impacting soil organic matter mineralization

Evidence of a plant genetic basis for maize roots impacting soil organic matter mineralization

Identification of barley genetic regions influencing plant–microbe interactions and carbon cycling in soil

Genetic control of rhizosheath formation in pearl millet

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