Effects of cropping systems, maize residues application and N fertilization on promiscuous soybean yields and diversity of native rhizobia in Central Kenya

Herrmann, Laetitia; Chotte, Jean‐Luc; Thuita, Moses; Lesueur, Didier

doi:10.1016/j.pedobi.2013.12.004

Cited by 31 publications

(15 citation statements)

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“…The changes in soil structural properties were induced by alternative agricultural management practices, and soil microbes made a significant contribution to organic matter decomposition, nutrient cycling, and functions related to soil health, quality, and ecosystem stability [47][48][49]. Among different soil microbial diversities, soil fungal communities are an essential and functional component of microorganisms; in emphasizing its prominence, we taxonomically classified the soil fungal community structure as influenced by the inclusion of a crop-specific sustainable cropping system examined through high-throughput sequencing technology.…”

Section: Discussionmentioning

confidence: 99%

“…The principal component analysis (PCA) of the fungal community, as shown in Figure 3, also elucidated that significant variations occurred between the green garlic-and cucumber-planted soils among the individual samples during the whole experiment duration, as well as between the treatments with green garlic and cucumber mono-cropping. Agricultural soil management practices and cropping systems can directly affect the fungal community composition, as reported by numerous authors [49,[65][66][67][68]. Continuous cropping under a protected cultivation system is becoming an unrealistic approach, which considerably affects the biomass and activity of soil microorganisms unless the cropping pattern is modified [44,69,70].…”

Section: The Dynamics Of a Three-year Green Garlic/cucumber Crop Rotamentioning

confidence: 99%

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Dynamics of a Soil Fungal Community in a Three-Year Green Garlic/Cucumber Crop Rotation System in Northwest China

2018

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Abstract:A decreased soil biological environment in terms of an unstable microbial population and diversity index is primarily caused by intensive continuous cropping systems. In this study, a crop rotation system was established to evaluate the soil fungal diversity using a pyrosequencing-based analysis during three successive growing seasons (2013, 2014, and 2015) under a field pot investigation. We found that overall green garlic/cucumber rotational effects increased cucumber productivity under these growing practices. Analysis of fungal communities in rhizosphere soils by high-throughput pyrosequencing showed that the estimated treatment effects were more obvious during the three-year trials, and OTU richness was much higher than the control in cucumber-planted soils. The relative frequencies of fungal diversity showed variable responses before and after rotation practices, and mainly α-diversity of fungi increased in garlic planted soil and again decreased after cucumber planted soil in each year. The phylogenetic classification illustrated that the fungal communities were dominated by the taxa Ascomycota, Basidiomycota, Chytridiomycota, Glomeromycota, and Zygomycota across all samples. Particularly, the relative abundance of the taxon Ascomycota was largely and predominantly enriched with the increasing number of garlic bulbs during the three years. Moreover, the majority of abundant taxa positively correlated with available P and K contents, while being highly negatively correlated with soil pH, EC, and SOC. These results indicate that garlic-cucumber-based crop rotations induce fungal richness and diversity and promote the sustainability of agricultural ecosystems, thus enhancing crop growth and production.

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Section: Discussionmentioning

confidence: 99%

Section: The Dynamics Of a Three-year Green Garlic/cucumber Crop Rotamentioning

confidence: 99%

Dynamics of a Soil Fungal Community in a Three-Year Green Garlic/Cucumber Crop Rotation System in Northwest China

2018

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“…The TGx soybean varieties also seem to have the ability to attract diverse indigenous bradyrhizobia in African soils as shown by B. japonicum, B. diazoefficiens , and B. elkanii which were recently identified as the dominant strains nodulating soybean in South Africa, Ethiopia, and Mozambique (Jaiswal et al, 2016; Naamala et al, 2016; Chibeba et al, 2017; Gyogluu et al, 2018). B. elkanii is also reported to be the major microsymbiont nodulating soybean in Malawian and Kenyan soils (Herrmann et al, 2014; Parr, 2014). Jaiswal et al (2016), Naamala et al (2016), and Gyogluu et al (2018) have similarly found B. elkanii and some native Bradyrhizobium species to be the dominant symbionts species nodulating soybean in South Africa, Mozambique and Ethiopia.…”

Section: Soybean Nodulation By Bradyrhizobium Speciesmentioning

confidence: 99%

Widespread Distribution of Highly Adapted Bradyrhizobium Species Nodulating Diverse Legumes in Africa

Jaiswal

Dakora

2019

Front. Microbiol.

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Bradyrhizobium is one of the most cosmopolitan and diverse bacterial group nodulating a variety of host legumes in Africa, however, the diversity and distribution of bradyrhizobial symbionts nodulating indigenous African legumes are not well understood, though needed for increased food legume production. In this review, we have shown that many African food legumes are nodulated by bradyrhizobia, with greater diversity in Southern Africa compared to other parts of Africa. From a few studies done in Africa, the known bradyrhizobia (i.e., Bradyrhizobium elkanii, B. yuanmingense ) along with many novel Bradyrhizobium species are the most dominant in African soils. This could be attributed to the unique edapho-climatic conditions of the contrasting environments in the continent. More studies are needed to identify the many novel bradyrhizobia resident in African soils in order to better understand the biogeography of bradyrhizobia and their potential for inoculant production.

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“…In this study, the soybean strains obtained were mostly from acidic to neutral soils with pH ranging from 4.4 to 7.0. Previous studies have found B. elkanii to be the dominant microsymbiont nodulating soybean varieties in Kenya [18] , Myanmar [41] , as well as other parts of Africa [1] , [20] , tropical and subtropical Asia [26] , North America [5] and South America [4] . While B. japonicum and B. elkanii species are the known bacterial symbionts of soybean found across many geographic and climatic regions, worldwide B. liaoningense , B. yuanmingense and Bradyrhizobium canariense have been isolated from root nodules under limited climatic conditions [50] , [51] .…”

Section: Discussionmentioning

confidence: 99%

Identification and distribution of microsymbionts associated with soybean nodulation in Mozambican soils

Gyogluu

Jaiswal

Kyei-Boahen³

et al. 2018

Systematic and Applied Microbiology

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Indigenous soybean rhizobial strains were isolated from root nodules sampled from farmers’ fields in Mozambique to determine their identity, distribution and symbiotic relationships. Plant infection assays revealed variable nodulation and symbiotic effectiveness among the 43 bacterial isolates tested. Strains from Ruace generally promoted greater whole-plant growth than the others. 16S rRNA-RFLP analysis of genomic DNA extracted from the rhizobial isolates produced different banding patterns, a clear indication of high bacterial diversity. However, the multilocus sequence analysis (MLSA) data showed alignment of the isolates with B. elkanii species. The 16S rRNA sequences of representative soybean isolates selected from each 16S rRNA-RFLP cluster showed their relatedness to B. elkanii, as well as to other Bradyrhizobium species. But a concatenated phylogeny of two housekeeping genes (glnII and gyrB) identified the soybean nodulating isolates as Bradyrhizobium, with very close relatedness to B. elkanii. The nifH and nodC sequences also showed that the majority of the test soybean isolates were closely related to B. elkanii, albeit the inconsistency with some isolates. Taken together, these findings suggest that the B. elkanii group are the preferred dominant microsymbiont of soybean grown in Mozambican soils. Furthermore, the distribution of soybean rhizobia in the agricultural soils of Mozambique was found to be markedly influenced by soil pH, followed by the concentrations of plant-available P and Mn. This study suggested that the identified isolates TUTMJM5, TUTMIITA5A and TUTLBC2B can be used as inoculants for increased soybean production in Mozambique.

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Effects of cropping systems, maize residues application and N fertilization on promiscuous soybean yields and diversity of native rhizobia in Central Kenya

Cited by 31 publications

References 91 publications

Dynamics of a Soil Fungal Community in a Three-Year Green Garlic/Cucumber Crop Rotation System in Northwest China

Dynamics of a Soil Fungal Community in a Three-Year Green Garlic/Cucumber Crop Rotation System in Northwest China

Widespread Distribution of Highly Adapted Bradyrhizobium Species Nodulating Diverse Legumes in Africa

Identification and distribution of microsymbionts associated with soybean nodulation in Mozambican soils

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