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Origin and genetic structure of the maize accessions. A, maize domestication and improvement process. B, neighborjoining phylogenetic tree constructed based on 8 463 SNPs. C, admixture plot showing clustering of different accessions into three clusters based on Bayesian-based clustering analysis.
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Domestication and genetic improvement of maize improve yield and stress tolerance due to changes in morphological and physiological properties, which likely alter rhizosphere microbial diversity. Understanding how the evolution of maize germplasm impacts its rhizobacterial traits during the growth stage is important to optimize plant-microbe associ...
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Context 1
... filtering the loci with missing genotypes, there were 8 463 high-quality SNPs. Using these SNPs, phylogenetic analysis showed that teosinte, landrace and inbred lines were clearly grouped into three clusters ( Fig. 1-A and B). We explored patterns of population structure in maize accessions using STRUCTURE analysis. There was a sharp peak of Δk at k=3, suggesting that the number of clusters was set to 3 germplasm groups; i.e., teosinte, landrace and inbred lines ( Fig. 1-C; Appendix ...
Context 2
... that teosinte, landrace and inbred lines were clearly grouped into three clusters ( Fig. 1-A and B). We explored patterns of population structure in maize accessions using STRUCTURE analysis. There was a sharp peak of Δk at k=3, suggesting that the number of clusters was set to 3 germplasm groups; i.e., teosinte, landrace and inbred lines ( Fig. 1-C; Appendix ...
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Foliar application of SA cross-talks and induce endogenous nitric oxide and reactive oxygen species to improve innate immunity and vigor of tomato plant against Fusarium oxysporum stress.
Abstract
The present investigation was aimed to demonstrate the efficacy of salicylic acid (SA), as a powerful elicitor or plant growth regulator (PG...
Citations
... This suggests that domestication does not significantly impact PGPB diversity but does alter the composition of bacterial groups and their interactions. However, the PGPB diversity and community composition appear to be favored by the domestication process, which contradicts studies that compare microbial communities in wild and domesticated genotypes (Pérez-Jaramillo et al., 2017;Huang et al., 2022;dos Santos et al., 2022). This finding suggests that PGPB are primarily recruited from microbial communities while potentially disfavoring other microbial groups. ...
... It contrasts with previous studies which showed the complexity of microbial connections in the rhizosphere decreasing from wild to domesticated genotypes (Pérez-Jaramillo et al., 2019;Rossmann et al., 2020;da Silva et al., 2022). However, a recent study with maize has shown that the complexity of the microbial network in the rhizosphere increased with domestication and even more with plant breeding (Huang et al., 2022). Interestingly, it could explain the highest complexity of microbial network in the rhizosphere of P. vulgaris, which is considered a modern cultivar. ...
The rhizospheric microbial community is affected by plant genera and genotypes. However, the rhizospheric effect on the microbial community from distinct plant species belonging to the same genus is poorly understood. This study hypothesized that the rhizospheric microbial community differs between plant species from the Phaseolus genus (i.e. P. acutifolius A. Gray, P. lunatus L., P. vulgaris L., P. microcarpus Mart., and P. filiformis Benth.) and that these differences could be related to phylogenetic differences found in these plant species. The redundancy analysis showed a distinct microbial community mainly when comparing P. lunatus and P. microcarpus. The microbial richness and diversity varied among plants, where P. lunatus showed the highest richness and diversity and P. microcarpus the lowest. The abundances of specific microbial phyla varied between the rhizosphere of Phaseolus species. Actinobacteria was abundant in the rhizosphere of P. acutifolius, P. vulgaris, and P. filiformis, while Acidobacteria was abundant in the rhizosphere of P. lunatus. This study revealed that each Phaseolus species recruits a distinct microbial community in the rhizosphere, with the rhizosphere community of the domesticated species P. lunatus being the most distinct.
... Frontiers in Microbiology 11 frontiersin.org soil microbial diversity and community structure (Huang et al., 2022;Xiao et al., 2022). In this study, it was found that root microorganisms were significantly different among different soybean cultivars. ...
Introduction
Soybean continuous cropping will change soil microorganisms and cause continuous cropping obstacles, resulting in a significant yield decline. Different soybean cultivars have different tolerances to continuous cropping, but the relationship between continuous cropping tolerance and soil microorganisms is not clear.
Methods
Two soybean cultivars with different tolerances to continuous cropping were used to study the effects of continuous cropping on soil physical and chemical properties, nitrogen and phosphorus cyclic enzyme activities, rhizosphere soil microbial community and function.
Results
The results showed that the yield reduction rate of a continuous-cropping-tolerant cultivar (L14) was lower than that of a continuous-cropping-sensitive cultivar (L10) under continuous cropping. At R1 and R6 growth stages, soil nutrient content (NH 4 ⁺ -N, NO 3 ⁻ -N, AP, DOM, TK, and pH), nitrogen cycling enzyme (URE, NAG, LAP) activities, phosphorus cycling enzyme (ALP, NPA, ACP) activities, copy numbers of nitrogen functional genes ( AOA , AOB , nirK , nirK ) and phosphorus functional genes ( phoA , phoB ) in L14 were higher than those in L10. Soybean cultivar was an important factor affecting the structure and functional structure of bacterial community under continuous cropping. The relative abundances of Proteobacteria , Bacteroidota , Acidobacteriota and Verrucomicrobiota with L14 were significantly higher than those of L10. The complexity of the soil bacterial community co-occurrence network in L14 was higher than that in L10.
Discussion
The continuous-cropping-tolerant soybean cultivar recruited more beneficial bacteria, changed the structure and function of microbial community, improved soil nitrogen and phosphorus cycling, and reduced the impact of continuous cropping obstacles on grain yield.
Plant growth-promoting rhizobacteria (PGPR) are an important component of the complex rhizosphere microbiome. It is often reported that the rhizosphere of different plant species selects their PGPR community, which promotes the growth of some more than others. In this greenhouse study using the same agricultural soil, we assessed the PGPR community in the rhizosphere of important plant species, including two cultivars (maize and cowpea) and one landrace (lima bean). The PGPR community structure differed between the rhizosphere the landrace and the cultivars, which presented similar community structures. The rhizosphere of lima bean showed exclusive PGPR groups (Streptomyces, Soliruborbacter, and Methylobacter), which are involved in resistance and stress tolerance in plants. The rhizosphere of both cultivars presented a similar relative abundance of Bacillus and Paenibacillus, groups involved in plant growth promotion by the production of antibiotics and biological N fixation. In addition, the cultivars presented more proportion of specialist microbes, and the community interaction was more complex than the landrace. The findings of this study expand the knowledge of the PGPR community in distinct plant species and confirm the significant effect of landraces and cultivars on rhizobacteria community selection.
