Drought, heat, and their combination impact the root exudation patterns and rhizosphere microbiome in maize roots

Tiziani, Raphael; Miras-Moreno, Begoña; Malacrinò, Antonino; Vescio, Rosa; Lucini, Luigi; Mimmo, Tanja; Cesco, Stefano; Sorgonà, Agostino

doi:10.1016/j.envexpbot.2022.105071

Cited by 64 publications

(26 citation statements)

References 72 publications

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“…This result conflicts with the field experiment results of Dietrich et al [66] and Bhanwaria et al [67]. A possible reason for this may be that our incubation experiment did not involve growing plants, which breaks the water-plantmicrobe linkages under increasing soil water, causing no carbon resources to be secreted by plant roots for microbial growth when water-enriched [68]. Moreover, an excessive water content in soil can suppress the microbial oxygen supply for microbe and nutrient uptake, thus causing the microbial biomass carbon to decrease in this study.…”

Section: The Changes In Soil Nutrients Enzyme Activities and Soil Mic...contrasting

confidence: 59%

Freeze–Thaw Cycles Have More of an Effect on Greenhouse Gas Fluxes than Soil Water Content on the Eastern Edge of the Qinghai–Tibet Plateau

et al. 2023

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The Qinghai-Tibetan Plateau (QTP) is sensitive to global climate change. This is because it is characterized by irregular rainfall and freeze–thaw cycles resulting from its high elevation and low temperature. Greenhouse gases (GHGs) mainly contribute to the warming of the QTP, but few studies have investigated and compared the effects of irregular rainfall and freeze–thaw cycles on GHGs. In this study, we conducted a laboratory experiment under four types of freeze–thaw treatments with three soil water content levels to simulate the irregular freeze–thaw and rainfall conditions. The results showed that both the soil water content and freeze–thaw treatment influenced the soil properties, soil enzyme activities, and the microbial biomass; however, the freeze–thaw treatment had significantly higher influences on GHG fluxes than soil water content. In order to explore other biotic and abiotic factors in an attempt to establish the main factor in determining GHG fluxes, a variation partition analysis was conducted. The results revealed that freeze–thaw treatments were the strongest individual factors in predicting the variance in N2O and CO2 fluxes, and the pH, which was only significantly affected by freeze–thaw treatment, was the strongest individual factor in predicting CH4 flux. Across the water content levels, all the freeze–thaw treatments increased the N2O flux and reduced the CH4 flux as compared to the CK treatment. In addition, long-term freezing reduced the CO2 flux, but the treatment of slowly freezing and quickly thawing increased the CO2 flux. In summary, these results suggest that the freeze–thaw treatments had quite different effects on N2O, CH4, and CO2 fluxes, and their effects on GHG fluxes are more significant than those of soil water content on the eastern edge of the QTP.

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Section: The Changes In Soil Nutrients Enzyme Activities and Soil Mic...contrasting

confidence: 59%

Freeze–Thaw Cycles Have More of an Effect on Greenhouse Gas Fluxes than Soil Water Content on the Eastern Edge of the Qinghai–Tibet Plateau

et al. 2023

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“…The maize rhizosphere was characterized by a higher abundance of the genus Saccharimonadia , which encompasses taxa with putative plant-beneficial features, such as improving nitrogen uptake efficiency and promoting nutrient conversion [ 65 , 66 ]. Bacteria affiliated with the genus Rhizobacter are well-known plant-growth-promoting rhizobacteria [ 67 , 68 , 69 ], and they were found to be more abundant in the maize rhizosphere than in bare soil ( Figure 4 ). A similar trend was observed by bacterial members associated with Arenimonas .…”

Section: Discussionmentioning

confidence: 99%

Nitrogen Fertilizer Type and Genotype as Drivers of P Acquisition and Rhizosphere Microbiota Assembly in Juvenile Maize Plants

Mang

Maywald

et al. 2023

Plants

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Phosphorus (P) is an essential nutrient for plant growth and development, as well as an important factor limiting sustainable maize production. Targeted nitrogen (N) fertilization in the form of ammonium has been shown to positively affect Pi uptake under P-deficient conditions compared to nitrate. Nevertheless, its profound effects on root traits, P uptake, and soil microbial composition are still largely unknown. In this study, two maize genotypes F160 and F7 with different P sensitivity were used to investigate phosphorus-related root traits such as root hair length, root diameter, AMF association, and multiple P efficiencies under P limitation when fertilized either with ammonium or nitrate. Ammonium application improved phosphorous acquisition efficiency in the F7 genotype but not in F160, suggesting that the genotype plays an important role in how a particular N form affects P uptake in maize. Additionally, metabarcoding data showed that young maize roots were able to promote distinct microbial taxa, such as arbuscular mycorrhizal fungi, when fertilized with ammonium. Overall, the results suggest that the form of chemical nitrogen fertilizer can be instrumental in selecting beneficial microbial communities associated with phosphorus uptake and maize plant fitness.

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“…The rhizosphere provides an important platform for plant-microbe communication, therefore, most studies in the context of plant-microbiome signalling have focused on this region (Jamil et al, 2022). As mentioned earlier, the rhizobiome composition is strongly influenced by the type of metabolites released through root exudation, whereas root exudation changes when the holobiont is subjected to abiotic (Tiziani et al, 2022) and biotic stressors (Rolfe et al, 2019). Therefore, plant microbiome engineering occurs naturally at the plant level, but the identity of metabolites and the multitude of mechanisms involved in the plant-microbiome communication are not fully understood.…”

Section: Manipulating Crop Microbiome In Situ Using Plant-microbe Com...mentioning

confidence: 99%

Next generation tools for crop‐microbiome manipulation to mitigate the impact of climate change

Batista

Singh

2022

Environmental Microbiology

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Drought, heat, and their combination impact the root exudation patterns and rhizosphere microbiome in maize roots

Cited by 64 publications

References 72 publications

Freeze–Thaw Cycles Have More of an Effect on Greenhouse Gas Fluxes than Soil Water Content on the Eastern Edge of the Qinghai–Tibet Plateau

Freeze–Thaw Cycles Have More of an Effect on Greenhouse Gas Fluxes than Soil Water Content on the Eastern Edge of the Qinghai–Tibet Plateau

Nitrogen Fertilizer Type and Genotype as Drivers of P Acquisition and Rhizosphere Microbiota Assembly in Juvenile Maize Plants

Next generation tools for crop‐microbiome manipulation to mitigate the impact of climate change

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