The diazotrophic community in oat rhizosphere: effects of legume intercropping and crop growth stage

Yang, Yadong; Feng, Xiaoqin; Hu, Yuegao; Zeng, Zhaohai

doi:10.15302/j-fase-2018212

Cited by 9 publications

(5 citation statements)

References 40 publications

(52 reference statements)

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“…Our observation that the trifolium–cucumber system had the highest nifH gene abundance in the two growing seasons ( Figure 2 ). Normally, nitrogen fixation rate is correlated with nifH gene abundance ( Reed et al, 2010 ), and it is possible that the higher nifH gene abundance, due to the presence of symbiotic N-fixers in cucumber intercropped with leguminous crops ( Yang Y. et al, 2019 ), may improve the nitrogen fixation in such treated soil. However, Rocca et al (2015) found that the higher abundance of the gene did not always lead to higher metabolic rates in soils.…”

Section: Discussionmentioning

confidence: 99%

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Impact of Intercropping on the Diazotrophic Community in the Soils of Continuous Cucumber Cropping Systems

Gao

2021

Front. Microbiol.

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Diazotrophs are important soil components that help replenish biologically available nitrogen (N) in the soil and contribute to minimizing the use of inorganic N fertilizers in agricultural ecosystems. However, there is little understanding of how diazotrophs respond to intercropping and soil physicochemical properties in cucumber continuous cropping systems. In this study, using the nifH gene as a marker, we have examined the impacts of seven intercropping plants on diazotrophic community diversity and composition compared to a cucumber continuous cropping system during two cropping seasons. The results showed that intercropping increased the abundance of the nifH gene, which was negatively correlated with available phosphorous in the fall. Diazotrophic diversity and richness were higher in the rape–cucumber system than in the monoculture. Multivariate regression tree analysis revealed that the diversity of the diazotrophic communties was shaped mainly by soil moisture and available phosphorous. Skermanella were the dominant genera in all of the samples, which increased significantly in the mustard–cucumber system in the fall. There was no effect of intercropping on the structure of the diazotrophic community in this case. Non-metric multidimensional scaling analysis showed that cropping season had a greater effect than intercropping on the community structure of the diazotrophs. Overall, our results suggest that intercropping altered the abundance and diversity rather than the structure of the diazotrophic community, which may potentially affect the N fixation ability of continuous cropping systems.

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Section: Discussionmentioning

confidence: 99%

“…The raw data were uploaded to the NCBI SRA database with the submission accession number SRP159857 . The read numbers of all the samples were normalized to the same sequencing depth, and the Chao1, Observed species, and Shannon and Simpson indices were chosen to evaluate alpha diversity ( Yang Y. et al, 2019 ).…”

Section: Methodsmentioning

confidence: 99%

Impact of Intercropping on the Diazotrophic Community in the Soils of Continuous Cucumber Cropping Systems

Gao

2021

Front. Microbiol.

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“…Soil microbe functioning can also be influenced by the intercropping of soybean and sugarcane [28], while a decrease in the function and diversity of rhizospheric soil microbes associated with oilseed rape plants has been reported in response to oilseed rape intercropping with milk vetch, with corresponding shifts in microflora structure [29]. Soybean-oat intercropping resulted in an increase in nitrogen-fixing microbial abundance in the rhizospheric soil of oat plants, in addition to modulating nitrogen-fixing microflora composition [30]. The intercropping of peanuts and sugarcane can increase beneficial microbial abundance and the diversity of bacteria in rhizospheric soil [31,32].…”

Section: Introductionmentioning

confidence: 99%

Effects of Intercropping and Nitrogen Application on Soil Fertility and Microbial Communities in Peanut Rhizosphere Soil

Wu,

Chen,

Huang

et al. 2024

Agronomy

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The intercropping of peanuts and sugarcane is a sustainable planting model that deserves in-depth research. For this study, two variables, i.e., intercropping status (peanut monocropping or sugarcane/peanut intercropping) and the level of nitrogen fertilization (low, medium, or high), were evaluated to analyze the effects of intercropping and nitrogen application on soil fertility and microbial communities in peanut rhizosphere soil. These analyses revealed that higher nitrogen application led to increased total nitrogen (TN), available nitrogen (AN), and soil organic matter (OM) levels in rhizosphere soil for both monocropped and intercropped peanuts, with a decrease in pH. Monocropped peanuts had higher TN, total phosphorus (TP), and total potassium (TK) levels compared to intercropped peanuts at the same nitrogen level but lower AN content and pH levels. The diversity of microbial communities in the rhizosphere soil of intercropped peanuts was significantly higher than that of monocropped peanuts under high levels of nitrogen fertilizer application. Higher levels of Gemmatimonadetes abundance were observed in intercropping rhizosphere soil, compared to that associated with peanut monocropping under low, middle, and high levels of nitrogen fertilizer application, whereas the opposite trend was observed for Chloroflexi abundance. Nitrospira abundance levels rose gradually in the monocropping treatment group, whereas the opposite trend was evident under intercropping conditions. Further analyses of nitrogen cycle-related genes demonstrated higher levels of nitrogen conversion cycle activity in intercropping peanut rhizosphere soil under low nitrogen levels, whereas nitrogen transformation cycle activity levels were higher in monocropping peanut rhizosphere soil under high levels of nitrogen amendment. It can be concluded that intercropping and nitrogen fertilizer application change the physical and chemical properties of soil, thus affecting the diversity and function of soil microbial communities in the peanut rhizosphere. These results offer a theoretical foundation for more efficient sugarcane/peanut intercropping systems.

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“…Variations in the microbial community inevitably give rise to variations in microbial function. In a legume intercropping system, soil nitrogen fixation function was promoted by increasing the abundance of nitrogen-fixing bacteria, such as Bradyrhizobium and Skermanella [19,20]. Intercropping could also reduce the relative abundance of denitrifying bacteria (Proteobacteria) by decreasing soil nitrate residues, achieving a suppression of N 2 O emissions [15,21].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have focused on the microbial community structure in intercropping systems of different crops [15][16][17][18][19][20]. Furthermore, most studies focused on interplanting with the same crop species have been limited to disease resistance and cross-fertilization.…”

Section: Introductionmentioning

confidence: 99%

Interplanting of Corn (Zea mays L.) Shifts Nitrogen Utilization by Promoting Rhizosphere Microbial Nitrogen Nitrification

Miao,

Shang,

Lin

et al. 2024

Agronomy

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Interplanting is an efficient method of improving nutrient utilization. However, the impact of intraspecific interplanting on rhizosphere microbial nitrogen cycling needs to be studied further. In this study, two corn cultivars were selected as the materials: Zhengdan958 (ZD958, high nitrogen use efficiency) and Denghai3622 (DH3622, low nitrogen use efficiency). Three planting patterns (interplanting, ZD958 monocropping, and DH3622 monocropping) were set up to study the effects of interplanting on crop growth and rhizosphere microbial nitrogen cycle function under two nitrogen levels: low nitrogen (140 kg N ha−1) and normal nitrogen (280 kg N ha−1). The results showed that the grain yield and nitrogen content in interplanting were significantly increased due to an enhanced leaf area index and root dry weight. The nitrogen accumulation and nitrogen use efficiency were enhanced by 8.14% and 19.38% in interplanting, which resulted in reductions in NH4+ and NO3− content in the rhizosphere. Interplanting enhanced rhizosphere nitrogen cycling processes; nitrification, denitrification, and nitrate reduction were increased. This study demonstrated that interplanting promotes corn nitrogen acquisition from the soil and indirectly regulates rhizosphere microbial function. These findings imply that the intraspecific interplanting of crops with appropriate functional traits is a promising approach to establishing diversified, productive, and efficient resource utilization ecosystems.

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The diazotrophic community in oat rhizosphere: effects of legume intercropping and crop growth stage

Cited by 9 publications

References 40 publications

Impact of Intercropping on the Diazotrophic Community in the Soils of Continuous Cucumber Cropping Systems

Impact of Intercropping on the Diazotrophic Community in the Soils of Continuous Cucumber Cropping Systems

Effects of Intercropping and Nitrogen Application on Soil Fertility and Microbial Communities in Peanut Rhizosphere Soil

Interplanting of Corn (Zea mays L.) Shifts Nitrogen Utilization by Promoting Rhizosphere Microbial Nitrogen Nitrification

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