Impact of growth stage on the bacterial community structure along maize roots, as determined by metabolic and genetic fingerprinting

Baudoin, Ezékiel; Benizri, Émile; Guckert, Armand

doi:10.1016/s0929-1393(01)00185-8

Cited by 202 publications

(132 citation statements)

References 36 publications

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“…The maximum acid phosphatase activity was observed at 75 DAT for rice (0.206 mg PNP/g h), 90 DAS for sorghum (0.194 mg PNP/g h) and pearl millet (0.201 mg PNP/g h), 50 DAS for soybean (0.127 mg PNP/g h), and 30 DAS for maize (0.154 mg PNP/g h) and, 50 DAS as well as 75 DAS for finger millet (0.180 mg PNP/g h), respectively. Similar observations about the effect of different micro-organism on acid phosphates were observed in maize [9,14]. Different crop growth stages showed different amount of acid phosphatase activity, it might be due to secretion of root exudates and biochemical changes in plant system [15].…”

Section: Resultssupporting

confidence: 63%

Rhizosphere Effect of Kharif Crops on Phosphatases and Dehydrogenase Activities in a Typic Haplustert

Dotaniya

Kushwah

Rajendiran

et al. 2014

Natl. Acad. Sci. Lett.

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In recent years phosphorus crisis is emerging at global level, every country in the world searching for alternative sources and management options for increasing its supply and use efficiency. Increasing cost of cultivation due to phosphatic fertilizers, attracting our mind towards it. In this experiment it was focused on effect of major kharif crops (maize, soybean, sorghum, pearl millet, finger millet and rice) on phosphatases and dehydrogenase activities in soil at different crop growth periods (30, 50, 75, 90 days after sowing and at crop harvest). Acid phosphatase activity varied crop wise and also at different crop growth periods. The maximum acid phosphatase activities were observed at 75 DAT in rice (0.206 mg PNP/g h), 90 DAS in sorghum (0.194 mg PNP/g h) and pearl millet (0.201 mg PNP/g h), 50 DAS in soybean (0.127 mg PNP/g h), and 30 DAS in maize (0.154 mg PNP/g h) and, 50 DAS as well as 75 DAS in finger millet (0.180 mg PNP/g h), respectively. But alkaline phosphatase activities were maximum at 75 days after sowing in all the crops i.e. sorghum (0.533 mg PNP/g h), soybean (0.465 mg PNP/g h), rice (0.440 mg PNP/g h), maize (0.538 mg PNP/g h), pearl millet (0.546 mg PNP/g h) and finger millet (0.530 mg PNP/g h), respectively. The dehydrogenase activities were also higher in 75 days after sowing in all the crops. These enzyme activities associated with higher availability and uptake of phosphorus.

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Section: Resultssupporting

confidence: 63%

Rhizosphere Effect of Kharif Crops on Phosphatases and Dehydrogenase Activities in a Typic Haplustert

Dotaniya

Kushwah

Rajendiran

et al. 2014

Natl. Acad. Sci. Lett.

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“…Studies have shown that rhizospheric fungal and bacterial communities of a wide range of plants (i.e., Arabidopsis, Medicago, maize, pea, wheat and sugar beet) change according to a plant developmental gradient (Baudoin et al, 2002;Mougel et al, 2006;Houlden et al, 2008;Micallef et al, 2009a). In these studies the microbial communities were assessed through automated ribosomal intergenic spacer analysis or denaturing gradient gel electrophoresis techniques that produce a fingerprint of the community structure but not of its members' identity.…”

Section: Introductionmentioning

confidence: 99%

Rhizosphere microbiome assemblage is affected by plant development

2013

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There is a concerted understanding of the ability of root exudates to influence the structure of rhizosphere microbial communities. However, our knowledge of the connection between plant development, root exudation and microbiome assemblage is limited. Here, we analyzed the structure of the rhizospheric bacterial community associated with Arabidopsis at four time points corresponding to distinct stages of plant development: seedling, vegetative, bolting and flowering. Overall, there were no significant differences in bacterial community structure, but we observed that the microbial community at the seedling stage was distinct from the other developmental time points. At a closer level, phylum such as Acidobacteria, Actinobacteria, Bacteroidetes, Cyanobacteria and specific genera within those phyla followed distinct patterns associated with plant development and root exudation. These results suggested that the plant can select a subset of microbes at different stages of development, presumably for specific functions. Accordingly, metatranscriptomics analysis of the rhizosphere microbiome revealed that 81 unique transcripts were significantly (Po0.05) expressed at different stages of plant development. For instance, genes involved in streptomycin synthesis were significantly induced at bolting and flowering stages, presumably for disease suppression. We surmise that plants secrete blends of compounds and specific phytochemicals in the root exudates that are differentially produced at distinct stages of development to help orchestrate rhizosphere microbiome assemblage.

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“…Spermosphere and rhizosphere microbial populations are influenced by the type and quantity of exudates from plant seeds and roots, as well as plant development status and sampling location (Campbell and Greaves, 1990;Buyer et al, 1999;Lugtenberg et al, 1999;Andrews and Harris, 2000;Duineveld et al, 2001;Whipps, 2001;Baudoin et al, 2002;de Boer et al, 2006). Although the plant can influence the abundance, diversity and composition of rhizosphere microbial communities, the role of soil microbial community composition and the soil organic matter cannot be neglected (Toal et al, 2000;Marschner et al, 2001;De Ridder-Duine et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Contrasting patterns of seed and root colonization by bacteria from the genus Chryseobacterium and from the family Oxalobacteraceae

Green

Michel²,

Hadar

et al. 2007

The ISME Journal

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Microbial colonization of plant seeds and roots is a highly complex process in which soil and plant type can influence the composition of the root-associated and rhizosphere microbial communities. Amendment of compost, a common agricultural technique, introduces exogenous nutrients and microorganisms to the soil-plant environment, and can further influence microbial community composition in the plant environment. Although compost amendments can strongly influence soil and rhizosphere microbial communities, there is evidence that with increasing proximity to the root, plant influences predominate over soil effects. We hypothesized that the 'rhizosphere effect' observed with proximity to plant surfaces does not act equally on all microorganisms. To explore this issue, we examined two bacterial taxa that reproducibly colonized seed and root surfaces in an experiment examining the influence of compost amendment on plant-associated bacterial communities. Population-specific analyses revealed striking differences in the ecology of bacteria from the genus Chryseobacterium and the family Oxalobacteraceae in potting mix and plantassociated environments. Seed-and root-colonizing Oxalobacteraceae populations were highly sensitive to plant effects, and phylogenetic analyses of root-colonizing Oxalobacteraceae revealed the presence of root-associated populations that were highly similar, regardless of treatment, and differed from the potting mix populations detected at the same sampling points. Conversely, Chryseobacterium community composition was found to be essentially invariant within treatments, but was strongly influenced by compost amendment. This persistence and stable nature of the Chryseobacterium community composition demonstrates that rhizosphere selection is not the exclusive factor involved in determining the composition of the cucumber spermosphere and rhizosphere communities.

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Impact of growth stage on the bacterial community structure along maize roots, as determined by metabolic and genetic fingerprinting

Cited by 202 publications

References 36 publications

Rhizosphere Effect of Kharif Crops on Phosphatases and Dehydrogenase Activities in a Typic Haplustert

Rhizosphere Effect of Kharif Crops on Phosphatases and Dehydrogenase Activities in a Typic Haplustert

Rhizosphere microbiome assemblage is affected by plant development

Contrasting patterns of seed and root colonization by bacteria from the genus Chryseobacterium and from the family Oxalobacteraceae

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