High Aluminum Drives Different Rhizobacterial Communities Between Aluminum-Tolerant and Aluminum-Sensitive Wild Soybean

Abstract

Aluminum (Al)-resistant plant cultivars can recruit beneficial microbes to alleviate the stresses. However, the mechanism of how rhizobacterial communities strengthen Al tolerance of wild soybean has not been addressed. The aim of this study was to investigate the bacterial community structure in the rhizosphere of Al-tolerant (BW69) and Al-sensitive (W270) wild soybean germplasm subjected to three Al concentrations. We analyzed the rhizobacterial communities of the two genotypes by high-throughput sequencing of 16S rRNA genes. The results showed that high Al stress recruited different rhizobacterial communities between two genotypes. In total, 49 OTUs, such as OTU15 (Gammaproteobacteria_KF-JG30-C25_norank), OTU23 (Mizugakiibacter), and OTU93 (Alkanibacter), were enriched in the rhizosphere of BW69 at the low and high Al concentrations. Moreover, bacterial community in the rhizosphere of BW69 had a more complex co-occurrence network than did W270 at the high Al concentration. Overall, our findings highlighted that high Al concentration magnified the difference in rhizobacterial community structure between two genotypes. However, the lower modularity of the co-occurrence network in rhizosphere of BW69 than W270 under Al stress may cause the rhizobacterial community to be less resistant and more influenced by disturbance. This study emphasizes the possibility of using rhizobacteria as an improved crop breeding or gene to produce crops that are more resistant to the toxicity of heavy metal.

Rice SST Variation Shapes the Rhizosphere Bacterial Community, Conferring Tolerance to Salt Stress through Regulating Soil Metabolites

“…In other words, these microbial species might be recruited in the rhizosphere after the loss of function of the SST gene in rice and were likely to help rice resistant to high salt stress. Among them, OTU1 ( Dyella ) has the highest relative abundance, and a previous study has reported that the genus Dyella was enriched in the rhizosphere of metal ion-tolerant soybeans, while there are few reports on the function of this bacterium ( 53 ). The most strongly promoted species of the plants without the SST gene are species that promote plant growth and facilitate phosphorus uptake in plants ( Burkholderiaceae ) or have a role in nitrogen cycling in soil (“ Candidatus Rhizobium”) ( 54 – 56 ).…”

Influence of Reagents on Qualitative Indicators of Artificial Anti-Deflationary Phytocenosis on Waste from a Rare Earth Tailing Facility

“…Plant tolerance to aluminum additionally depends on the genetically determined resistance mechanism developed by certain plants by stimulating the secretion of organic acids [ 56 ]. In various research works, the toxic effects of the cationic form of aluminum Al 3+ , which is characteristic of solutions with a pH less than 4 [ 56 , 69 , 71 , 72 ], has been widely noted. For solutions characterized by a pH of more than 5.5, on the other hand, neutrally charged Al(OH) 3 [ 73 ] molecules predominate, which suggests a decrease in toxicity compared to the reactive cationic form.…”

Alleviating Soil Acidification Could Increase Disease Suppression of Bacterial Wilt by Recruiting Potentially Beneficial Rhizobacteria

“…The organic acids released from plant roots, such as citric acid, oxalic acid, and malic acid, can chelate Al 3+ , thereby alleviating aluminum toxicity ( 63 ). Aluminum stress changed the rhizosphere bacterial communities ( 64 ). When plants are in a stressful environment, root exudates can attract beneficial microbes from the environment, which is called a “cry for help” strategy ( 65 ).…”