Does cultivation influence the content and pattern of soil proteins?

Khalili, Banafshe; Nili, Nafiseh; Nourbakhsh, Farshid; Sharifnabi, B.; Khademi, Hossein

doi:10.1016/j.still.2010.09.009

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…EE-GRPS is the soil glycoprotein fraction easily decomposed and deposited recently Upadhyaya, 1998). Thus, the high microbial activity contributed to its degradation, resulting in the low levels found in this study corroborating with Rillig et al (2005) and Khalili et al (2011). Treseder and Turner (2007) point out that in soils where nutrients and carbon availability is limited, glomalin can be quickly mineralized, especially the fraction EE-GRPS, resulting in its reduction, as shown by our results.…”

Section: Treatmentssupporting

confidence: 88%

Arbuscular mycorrhizal fungus in microbial activity and aggregation of a Cerrado Oxisol in crop sequence

et al. 2014

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Soil structure has major influence on ecosystem sustainability and plant growth. Arbuscular mycorrhizal fungi (AMF) are an important functional group of soil microbiota, acting in the process of aggregation, especially in agroecosystems and related to the production and plant diversity. AMF are widely distributed in tropical agroecosystems and are extremely important for development of many agricultural crops. The present study evaluated the effect of inoculation with Glomus macrocarpum in different crop sequences on plant growth, microbial activity and aggregation of a Cerrado Oxisol. The study was conducted in a completely randomized design in a4 x 4 factorial scheme. Treatments consisted of four conditions of elimination and/or introduction of AMF (NS-NI: non-sterilized and non-inoculated; NS-I: non-sterilized and inoculated; S-NI: sterilized and non-inoculated; andS-I: sterilized and inoculated) and four crop sequences (Panicum maximum/Panicum maximum, Brachiaria ruziziensis/ soybean, sorghum/soybean and Stylosanthes spp./soybean). Inoculation favored growth of Stylosanthes spp. by increasing plant growth in up to 91% when inoculated. None of the grasses benefited from G. macrocarpum introduction. We observed that G. macrocarpum inoculation associated with indigenous AMF increased microbial biomass, phosphatase activity, mean geometric diameter and mean weighted diameter. The results indicated the beneficial effects of inoculation, which reflected in soil structure improvement and, hence, to agroecosystems sustainability.Index terms: Microbial carbon, acid phosphatase, mean geometric diameter, mean weight diameter, soil structure. RESUMOA estrutura do solo exerce importante influência na sustentabilidade dos ecossistemas e no crescimento de plantas. Os fungos micorrízicos arbusculares (FMAs) constituem um importante grupo funcional da microbiota do solo, atuando diretamente nos processos de agregação, principalmente em agroecossistemas e têm relação direta com a produção e diversidade vegetal. Esses estão amplamente distribuídos no agroecossistemas tropicais e são extremamente importantes para o crescimento de várias espécies vegetais agrícolas. No presente estudo, avaliou-se o efeito da inoculação com Glomus macrocarpum e diferentes sucessões de culturas no crescimento vegetal, na atividade microbiana e na agregação de um Latossolo Vermelho de Cerrado. O estudo foi conduzido em delineamento inteiramente casualizado com arranjo fatorial 4 x 4. Os tratamentos constituíram da combinação entre quatro condições de eliminação e/ou introdução de FMA (NS-NI: não autoclavado-não inoculado; NS-I: não autoclavado-inoculado; S-NI: autoclavado-não inoculado; S-I: autoclavado-inoculado) e quatro sucessões de culturas (Panicum maximum/Panicum maximum; Brachiaria ruziziensis/soja; sorgo/soja; Stylosanthes spp./soja). A inoculação com FMAs favoreceu o crescimento do estilosantes, apresentando aumento de até 91% na produção de massa seca quando inoculado. Nenhumas das gramíneas beneficiaram-se com a introdução de G. ...

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Section: Treatmentssupporting

confidence: 88%

Arbuscular mycorrhizal fungus in microbial activity and aggregation of a Cerrado Oxisol in crop sequence

et al. 2014

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“…Free amino acids were extracted using a modified procedure by Khalili et al (2011). In brief, 3 g of the soil (stored at −80°C) was mixed with 4 mL of Tris–HCl buffer (50 mM, pH 6.8) containing 1% ( v / v ) Triton X100.…”

Section: Methodsmentioning

confidence: 99%

Variation of soil amino acid pools and N‐hydrolysis potential in arid lands

Khosrozadeh,

Khalili,

Nourbakhsh

2023

European J Soil Science

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Identification of the patterns through which potential rates of proteolysis and ammonification are affected by key edaphic and climatic factors offer a powerful avenue for elucidating the potential of nitrogen (N) cycle processes in arid terrestrial ecosystems. Here, we aimed to investigate how the tradeoff between soil properties and climatic factors govern amino acids and the nitrogen cycling enzyme traits in steppe biomes. We analysed changes in amino acid pools and protease and amidohydrolase activities along arid and semi‐arid climate gradients over time. The biome edaphic factors (site) were found to have significant (p < 0.001) effects on all enzyme activities, while climatic factors (time) showed significant (p < 0.001) effects on protease, L‐glutaminase, and L‐asparaginase activities. Over the sites and times, the soil moisture (%) explained 20%–27% of the variation in protease, L‐glutaminase, and L‐asparaginase activities. Soil‐free amino acid concentrations were observed to be significantly affected by site (p < 0.05). The aliphatic and polar amino acid pools, however, were the only soil‐free amino acid pools that significantly varied with time (p < 0.05). Pools of aliphatic and polar amino acids were significantly negatively correlated with soil moisture (r = −0.55, p < 0.05). These results find that the soil N dynamics in arid ecosystems might dramatically depend dramatically on edaphic factors and plant litter properties, and changes in soil pH, electrical conductivity, clay content, total soil organic carbon and total soil and litter N maybe even more important than the soil moisture, although sensitivity to edaphic factors were found to vary with a pathway and time of sampling. Thus, the information on N pools and N‐hydrolysis potential could be useful in linking climatic‐soil factors with arid ecosystem N fluxes.

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