Soil microbial biomass, functional diversity and enzyme activity in glyphosate-resistant wheat–canola rotations under low-disturbance direct seeding and conventional tillage

Lupwayi, Newton Z.; Hanson, K.; Harker, K. Neil; Clayton, George W.; Blackshaw, Robert E.; O’Donovan, John T.; Johnson, Eric N.; Gan, Yantai; Irvine, R. B.; Monreal, M.

doi:10.1016/j.soilbio.2006.12.038

Cited by 77 publications

(47 citation statements)

References 27 publications

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“…The application of any xenobiotic on soil can change the structure of a microbial community (Johnsen et al, 2001) and the magnitude of this influence depends both on soil properties as well as on specific characteristics of the microorganisms and the product applied (Vischetti et al, 2002;Yang et al, 2007). Microbial population may decrease (Macur et al, 2007), increase (Moreno et al, 2007) or even remain unaltered (Lupwayi et al, 2007) in response to an application of a herbicide. Imadazollinone degradation in soil in response to application history Herbicides can affect microorganisms, reducing their number, biochemical activity and/or changing the structure of the soil microbial community.…”

Section: Resultsmentioning

confidence: 99%

Imidazolinone Degradation in Soil in Response to Application History

et al. 2015

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-Accelerated herbicide degradation consists in its faster degradation in areas where it has been previously applied, due to the adaptation of microbial population to that particular compound. Accelerated degradation can reduce herbicide persistence and reduce its efficacy in soil. The objective of this study was to investigate if imidazolinone herbicides have enhanced microbial degradation in rice paddy soils. A laboratory experiment was conducted, evaluating the CO 2 evolution rate from soils with and without history of herbicide application (imazapyr + imazapic and imazethapyr + imazapic), incubated with imidazolinone herbicides: imazethapyr, imazapyr, imazapic, imazamethabenz, imazamox and an untreated check. The amount of CO 2 released from the soil was measured. As a result, the prior application of imidazolinones does not stimulate microbial degradation of herbicides from the same chemical group.Keywords: residual effect, herbicide, microbial activity, Oryza sativa. RESUMO -A degradação acelerada consiste na rápida dissipação de um herbicida, sendo decorrente da adaptação da população microbiana do solo ao composto, o qual pode ser utilizado como fonte de carbono, energia e/ou nutrientes. Diversos herbicidas têm sua degradação estimulada quando aplicados em áreas com histórico de aplicação de produtos idênticos e/ou semelhantes. O objetivo deste trabalho foi verificar a degradação de imidazolinonas em solos com e sem histórico de aplicação das misturas formuladas imazethapyr + imazapic e imazapyr + imazapic. Para isso

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Section: Resultsmentioning

confidence: 99%

Imidazolinone Degradation in Soil in Response to Application History

et al. 2015

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“…Por outro lado, cerca de 65% dos isolados oriundos do solo das entrelinhas se agruparam nos grupos V, VI e VII, com características morfológicas de P. putida (Figura 4A). Embora a literatura relate o efeito do tipo de manejo do solo sobre a microbiota (Lupwayi et al, 2007), não foi possível observar diferenças entre plantio direto e plantio convencional nos GGM (Figura 4B).…”

Section: Figure 3 Distribution Of Fluorescent Isolates Of Pseudomonaunclassified

Diversidade de Pseudomonas fluorescentes em sistemas de manejo do solo e rotação de culturas

Ferreria¹,

Voss

Santos

et al. 2009

Agraria

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Diversidade de Pseudomonas fluorescentes em diferentes sistemas de manejo do solo e rotação de culturas RES UMOO objetivo neste trabalho foi avaliar o efeito do sistema de manejo do solo (plantio direto e plantio convencional) e da rotação de culturas na diversidade de Pseudomonas fluorescentes isoladas de rizoplano e no solo das entrelinhas de trigo, com base nas características morfológicas e genotípicas destas bactérias. Na análise morfológica, a maioria dos isolados obtidos de rizoplano apresentou características de P. fluorescens, enquanto naqueles obtidos de solo foram observadas características de P. putida. A análise de correspondência, realizada com os dados morfológicos, comprovou que os isolados de solo são mais semelhantes aos da mata que os de rizoplano. A população de Pseudomonas do rizoplano é muito homogênea e não sofreu efeito do sistema de manejo do solo nem da rotação de culturas. Por outro lado, a população do solo das entrelinhas formou dois grupos, um para o plantio direto e outro para o convencional. A análise por ARDRA (Amplified Ribosomal DNA Restriction Analysis) resultou em três grupos genotípicos, com predominância dos isolados obtidos de rizoplano, com características morfológicas de P. fluorescens. Esses dados indicam a existência de um processo de seleção da comunidade bacteriana, controlado pela planta, que apresenta em seu rizoplano uma prevalência Pseudomonas com características morfológicas de P. fluorescens. Palavras-chave: análise multivariada, características morfológicas, marcador molecularFluorescent Pseudomonas diversity in different soil management and crop rotation systems AB S TR ACTThe objective of this work was to evaluate the effects of different soil management (no-tillage and conventional system) and crop rotation systems on the diversity of fluorescent Pseudomonas obtained from the rhizoplane and soil samples of wheat interlines, assessed by morphological and genotypic data. Morphological data analysis indicates that the majority of the isolates from the rhizoplane show characteristics of P. fluorescens, while the isolates from the soil have characteristics of P. putida. The correspondence analysis based on morphological data showed that the soil isolates are more similar to the ones of a forest area than the ones of the rhizoplane. Pseudomonas population from the rhizoplane is very homogeneous, without any effect of both management system and crop rotation. On the other hand, population from the interline soil samples formed two groups, one for the no-tillage system and another for the conventional system. ARDRA analysis showed three genotypic groups, dominated by the isolates obtained from the rhizoplane, with morphological characteristics of P. fluorescens. These data indicate a selection process on the bacterial community controlled by the plant, where the presence of fluorescent Pseudomonas with morphological characteristics of P. fluorescens in the wheat rhizoplane is prevalent.

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“…The conservation tillage improves soil organic carbon (SOC) concentration, water storage and reduces soil erosion, and subsequently enhances soil quality and resilience (21). It also increases SMBC (18), activities of several soil enzymes (20,23) as well as the soil respiration (40).…”

Section: Introductionmentioning

confidence: 99%

Conservation tillage, optimal water and organic nutrient supply enhance soil microbial activities during wheat (Triticum Aestivum L.) cultivation

Sharma¹,

Singh²,

Singh³

2011

Braz. J. Microbiol.

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The field experiments were conducted on sandy loam soil at New Delhi, during 2007 and to investigate the effect of conservation tillage, irrigation regimes (sub-optimal, optimal and supra-optimal water regimes), and integrated nutrient management (INM) practices on soil biological parameters in wheat cultivation. The conservation tillage soils has shown significant (p<0.05) increase in soil respiration (81.1%), soil microbial biomass carbon (SMBC) (104%) and soil dehydrogenase (DH) (59.2%) compared to the conventional tillage soil. Optimum water supply (3-irrigations) enhanced soil respiration over sub-optimum and supra-optimum irrigations by 13.32% and 79% respectively. Soil dehydrogenase (DH) activity in optimum water regime has also increased by 23.33% and 8.18% respectively over the other two irrigation regimes. Similarly, SMBC has also increased by 12.14% and 27.17% respectively in soil with optimum water supply compared to that of sub-optimum and supra-optimum water regime fields. The maximum increase in soil microbial activities is found when sole organic source (50% Farm Yard Manure+25% biofertilizer+25% Green Manure) has been used in combination with the conservation tillage and the optimum water supply. Study demonstrated that microbial activity could be regulated by tillage, water and nitrogen management in the soil in a sustainable manner.

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Soil microbial biomass, functional diversity and enzyme activity in glyphosate-resistant wheat–canola rotations under low-disturbance direct seeding and conventional tillage

Cited by 77 publications

References 27 publications

Imidazolinone Degradation in Soil in Response to Application History

Imidazolinone Degradation in Soil in Response to Application History

Diversidade de Pseudomonas fluorescentes em sistemas de manejo do solo e rotação de culturas

Conservation tillage, optimal water and organic nutrient supply enhance soil microbial activities during wheat (Triticum Aestivum L.) cultivation

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