Relationship between pepper (Capsicum annuum L.) root morphology, inter-root soil bacterial community structure and diversity under water–air intercropping conditions

Liu, Hongjun; Jin, Cuicui; Xiao, Zheyuan; Chen, Jian; Leghari, Shah Jahan; Pan, Hongwei

doi:10.1007/s00425-023-04134-y

Cited by 5 publications

(4 citation statements)

References 50 publications

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“…Thus, ADI reduced the relative abundance of Proteobacteria. This result corroborates with that of previous studies [39,47] and the study by Šibanc et al, which reported a high abundance of Proteobacteria in soils with higher CO 2 concentrations than in soils with lower CO 2 concentrations [48]. In addition, compared to the non-aerated treatment, the relative abundance of Firmicutes and Gemmatimonadetes was higher at 10 mg L −1 DO.…”

Section: Effects Of Adi On Bacterial Community Diversity and Structuresupporting

confidence: 93%

Impact of Aerated Drip Irrigation and Nitrogen Application on Soil Properties, Soil Bacterial Communities and Agronomic Traits of Cucumber in a Greenhouse System

Xiao,

Lei,

Lian

et al. 2023

Plants

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Root hypoxia stress and soil nutrient turnover have been related to reduced crop productivity. Aerated drip irrigation (ADI) can effectively enhance crop productivity and yield. However, the response of the soil bacterial community to different irrigation water dissolved oxygen (DO) concentrations remains elusive due to the extreme sensitivity of microorganisms to environmental variations. We investigated the effects of aerated irrigation with different concentrations of DO on soil properties and agronomic performance of cucumber, as well as the contribution of the bacterial community. We performed experiments on cucumber cultivation in Shouguang, China, including different irrigation methods (ADI: O2–10 and O3–20 mg L−1, non-aerated groundwater: O1–5 mg L−1) and nitrogen (N) application rates: 240 and 360 kg N ha−1. ADI (particularly O2) significantly improved soil properties, root growth, cucumber yields, and irrigation water use efficiency (IWUE), and appropriate DO concentrations reduced N fertilizer application and increased crop yields. Furthermore, these changes were associated with bacterial community diversity, aerobic bacteria abundance, and consolidated bacterial population stability within the network module. Environmental factors such as soil respiration rate (Rs), DO, and NO3−-N have significant effects on bacterial communities. The FAPROTAX results demonstrated enhanced nitrification (Nitrospira) and aerobic nitrite oxidation by soil bacteria under ADI, promoting the accumulation of effective soil N and improved soil fertility and crop yield. Appropriate DO concentration is conducive to the involvement of soil bacterial communities in regulating soil properties and cucumber growth performance, which are vital for the sustainable development of facility agriculture.

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Section: Effects Of Adi On Bacterial Community Diversity and Structuresupporting

confidence: 93%

Impact of Aerated Drip Irrigation and Nitrogen Application on Soil Properties, Soil Bacterial Communities and Agronomic Traits of Cucumber in a Greenhouse System

Xiao,

Lei,

Lian

et al. 2023

Plants

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“…In the root-bacteria interaction process, an increase in root length corresponds to an increase in root exudates as well as an expansion of the soil volume influenced by the roots (Van et al, 2020); these changes have a feedback effect that alters the bacterial community function and soil nutrient effectiveness (Kaisermann et al, 2015). Therefore, the increase in root length of tomato in this study was the result of the combined effect of waterair balance regulation and bacterial community changes in saline soils (Lei et al, 2023). The root-bacteria interaction effect observed in this study is likely not as simple as an effect of root length on bacterial function, as reflected in the structural equation, but it reflects a possible pathway for the cumulative effect of micronanobubble oxygenated drip irrigation to regulate tomato yield (Chen et al, 2023).…”

Section: Root-bacteria Interaction and Its Effect On Tomato Yieldmentioning

confidence: 81%

“…These results can be attributed to the synergistic effect of water and oxygen in promoting qualitative changes in the bacterial communities in saline soils (Jassey et al, 2018). Lei et al (2023) also found that a reasonable water-air combination could significantly change the soil bacterial community structure; however, their results were from a nonsaline soil. Our study provides evidence for the more refined application of micronanobubble oxygenated drip irrigation to regulate microbial communities in salinized soil and improve soil fertility, but the relevant mechanisms still need to be further studied.…”

Section: Response Of the Bacterial Community Composition To Water-oxy...mentioning

confidence: 97%

Response of the tomato rhizosphere bacterial community to water–oxygen coupling under micronanobubble oxygenated drip irrigation in mildly saline soil

Wang,

Guo,

Zhang

et al. 2023

Land Degrad Dev

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The deterioration of the soil water–air environment due to salinization can reduce soil bacterial activity and cause crop yield reduction. Micronanobubble oxygenated drip irrigation can significantly improve the nonsaline soil water–air environment and enhance bacterial activity, but its effect on salinized soil bacteria is unknown. In this study, we used a tomato cultivation experiment in mildly saline soil to evaluate the responses of the rhizosphere bacterial community to the soil microenvironment created by micronanobubble oxygenated drip irrigation. The results indicated that the soil environmental factors (including soil electrical conductivity, i.e., EC) (r = 0.46) and root length (r = −0.86) had important regulatory effects on bacterial community function, which had significant direct effects on tomato yield (r = 0.46). The moderate dissolved oxygen concentration treatment significantly reduced the EC by 63.22%–73.32% compared with CK (noncultivated soil treatment) and generally increased the root length; however, only the combination of a moderate dissolved oxygen concentration and excess irrigation (A15W1.2) significantly increased tomato yields by 190.90% compared with A0W0.8 (the combination of a low dissolved oxygen concentration and insufficient irrigation) because the irrigation water volume was the limiting condition affecting the benefits of the root length increase. The high dissolved oxygen concentration treatment significantly reduced the EC by 60.36%–92.31% and increased the bacterial community diversity by 4.08%–6.16% compared with CK; these aforementioned changes favored the increase in tomato yield. However, similar to the result of the moderate dissolved oxygen treatments, the tomato yields were significantly higher and among the highest of all treatments only when a high dissolved oxygen concentration was combined with sufficient irrigation or excess irrigation (A30W1 or A30W1.2) due to the limiting effect of the irrigation water volume. Therefore, accounting for the changes in EC, soil bacterial community, and tomato yields, A15W1.2, A30W1, and A30W1.2 are recommended for tomato production in mildly saline soils.

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“…ADI promotes crop growth, fertilizer uptake, and utilization by altering the soil microenvironment, which in turn affects soil water, fertilizer transport, and transformation [ 23 ]. In this study, it was found that soil N distribution was stable throughout the reproductive period of chili peppers under ADI conditions, whereas the change in soil N content fluctuated greatly under conventional SDI treatment conditions.…”

Section: Discussionmentioning

confidence: 99%

Effects of Aerated Drip Irrigation on the Soil Nitrogen Distribution, Crop Growth, and Yield of Chili Peppers

Lei,

Xia,

Xiao

et al. 2024

Plants

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In order to study the soil nitrogen (N) distribution pattern in the root zone of chili peppers under aerated drip irrigation (ADI) conditions and analyze the relationship between soil N distribution and crop growth, two irrigation methods (conventional drip irrigation and ADI) and three N levels (0, 140, and 210 kg hm−2) were set up in this experiment. Soil samples were collected by the soil auger method at the end of different reproductive periods, and the uniformity coefficient of soil N in the spatial distribution was calculated by the method of Christiansen’s coefficient. The growth status and soil-related indices of pepper were determined at each sampling period, and the relationships between soil N distribution and chili pepper growth were obtained based on principal component analysis (PCA). The results showed that the spatial content of soil nitrate-N (NO3−-N) fluctuated little during the whole reproductive period of chili peppers under ADI conditions, and the coefficient of uniformity of soil NO3−-N content distribution increased by 5.29~37.63% compared with that of conventional drip irrigation. The aerated treatment increased the root length and surface area of chili peppers. In addition, the ADI treatments increased the plant height, stem diameter, root vigor, and leaf chlorophyll content to some extent compared with the nonaerated treatment. The results of PCA showed that the yield of chili peppers was positively correlated with the uniformity coefficient of soil NO3−-N, root vigor, and root length. ADI can significantly improve the distribution uniformity of soil NO3−-N and enhance the absorption and utilization of N by the root system, which in turn is conducive to the growth of the crop, the formation of yields, and the improvement of fruit quality.

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Relationship between pepper (Capsicum annuum L.) root morphology, inter-root soil bacterial community structure and diversity under water–air intercropping conditions

Cited by 5 publications

References 50 publications

Impact of Aerated Drip Irrigation and Nitrogen Application on Soil Properties, Soil Bacterial Communities and Agronomic Traits of Cucumber in a Greenhouse System

Impact of Aerated Drip Irrigation and Nitrogen Application on Soil Properties, Soil Bacterial Communities and Agronomic Traits of Cucumber in a Greenhouse System

Response of the tomato rhizosphere bacterial community to water–oxygen coupling under micronanobubble oxygenated drip irrigation in mildly saline soil

Effects of Aerated Drip Irrigation on the Soil Nitrogen Distribution, Crop Growth, and Yield of Chili Peppers

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