| Title | Soil microbial functional capacity and diversity in a millet-shrub intercropping system of semi-arid Senegal |
| Publication Type | Journal Article |
| Year of Publication | 2016 |
| Authors | Diakhate S., Gueye M., Chevallier T., Diallo N.H, Assigbetse K., Abadie J., Diouf M., Masse D., Sembene M., Ndour Y.B, Dick R.P, Chapuis-Lardy L. |
| Journal | Journal of Arid Environments |
| Volume | 129 |
| Pagination | 71-79 |
| Date Published | Jun |
| Type of Article | Article |
| ISBN Number | 0140-1963 |
| Accession Number | WOS:000376806900009 |
| Keywords | 16S-and ITS-DGGE profiling, agroecosystems, biomass, Br., carbon, communities, crop productivity, Environmental Sciences & Ecology, hydraulic redistribution, microresp (tm), native shrub, Pennisetum glaucum (L.) R., Piliostigma reticulatum, residue decomposition, sahel, Soil enzyme activity, Sub-Saharan Africa, west-africa |
| Abstract | A few species of shrubs grow with dryland row crops in farmers' fields throughout the Sahel and can significantly increase crop yield. The presence of shrub roots and litter inputs should have implications for soil nutrient pool sizes but there is limited information on the interactions of these shrubs with microbial communities involved in biogeochemical processes. Therefore, the objective of this study was to determine the microbial composition and functional capacity of soil from the rooting zone of pearl millet (Pennisetum glaucum) grown in the presence or absence of the shrub Piliostigma reticulatum in Senegal. Soil samples were collected from a long-term field study where millet was cultivated alone or intercropped with P. reticulatum with annual incorporation of coppiced shrub residues. Higher nutrient contents and distinct differences in microbial communities (DGGE profiles) were found between soils from beneath the canopy compared to soil outside the influence of shrubs. The catabolic response profile (MicroResp (TM)) showed that the soil microbial community at both shrub and non-shrub sampling locations, metabolized a wide range of substrates. Trehalose that can work as a signaling molecule was more rapidly degraded in the rooting zone of millet growing in the presence of P. reticulatum over millet alone. Urease, arylsulfatase and dehydrogenase activities in the millet root zone soil were higher when inter cropped with P. reticulatum which indicates enhanced potential of biogeochemical processes to proceed in the presence of this shrub. It is concluded that the native shrub P. reticulatum promotes a more diverse and active microbial community in the rooting zone of millet and further indicates greater potential to perform decomposition and mineralize nutrients. (C) 2016 Elsevier Ltd. All rights reserved. |
| Short Title | J. Arid. Environ.J. Arid. Environ. |
| Alternate Journal | J. Arid. Environ. |
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- Soil microbial functional capacity and diversity in a millet-shrub intercropping system of semi-arid Senegal
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[biblio_abst_e] => A few species of shrubs grow with dryland row crops in farmers' fields throughout the Sahel and can significantly increase crop yield. The presence of shrub roots and litter inputs should have implications for soil nutrient pool sizes but there is limited information on the interactions of these shrubs with microbial communities involved in biogeochemical processes. Therefore, the objective of this study was to determine the microbial composition and functional capacity of soil from the rooting zone of pearl millet (Pennisetum glaucum) grown in the presence or absence of the shrub Piliostigma reticulatum in Senegal. Soil samples were collected from a long-term field study where millet was cultivated alone or intercropped with P. reticulatum with annual incorporation of coppiced shrub residues. Higher nutrient contents and distinct differences in microbial communities (DGGE profiles) were found between soils from beneath the canopy compared to soil outside the influence of shrubs. The catabolic response profile (MicroResp (TM)) showed that the soil microbial community at both shrub and non-shrub sampling locations, metabolized a wide range of substrates. Trehalose that can work as a signaling molecule was more rapidly degraded in the rooting zone of millet growing in the presence of P. reticulatum over millet alone. Urease, arylsulfatase and dehydrogenase activities in the millet root zone soil were higher when inter cropped with P. reticulatum which indicates enhanced potential of biogeochemical processes to proceed in the presence of this shrub. It is concluded that the native shrub P. reticulatum promotes a more diverse and active microbial community in the rooting zone of millet and further indicates greater potential to perform decomposition and mineralize nutrients. (C) 2016 Elsevier Ltd. All rights reserved.
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Times Cited: 20
Cited Reference Count: 52
Diakhate, S. Gueye, M. Chevallier, T. Diallo, N. H. Assigbetse, K. Abadie, J. Diouf, M. Masse, D. Sembene, M. Ndour, Y. B. Dick, R. P. Chapuis-Lardy, L.
LARDY, Lydie/B-5324-2009; Chevallier, Tiphaine/F-9151-2011; Assigbetsé, Komi/U-5500-2018; Masse, Dominique/A-7603-2011; LARDY, Lydie/AAS-6313-2021
LARDY, Lydie/0000-0003-0393-3239; Chevallier, Tiphaine/0000-0001-8285-3856; Assigbetsé, Komi/0000-0002-5181-6603; Masse, Dominique/0000-0002-3165-1469; LARDY, Lydie/0000-0003-0393-3239; Diakhate, Sidy/0000-0003-1055-4261
NSF's PIRE3 program [OISE-0968247]; Institut de Recherche pour le Developpement (IRD, France)
The work was conducted in close collaboration with a project funded by the NSF's PIRE3 program (Grant No. OISE-0968247). We are grateful to Lamine Dieng (IRD) for his precious support in the lab. We thank Roger Bayala and Dr Diedhiou (ENSA Thies), Pape Omar Dieye (ISRA Bambey) and Moussa Diop (ISRA Nioro) for their help with sampling. Soil chemical analyses have been performed by the Laboratoire des moyens analytiques (US Imago, IRD Dakar). Dr. Sidy Diakhate gratefully acknowledges doctoral fellowship of the Institut de Recherche pour le Developpement (IRD, France). Finally I would like to thank the two anonymous referee for these suggestions to improve the quality of the manuscript.
20
3
71
Academic press ltd- elsevier science ltd
London
1095-922x
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Diakhate, S (corresponding author), Ctr IRD ISRA, LNRPV, ISRA, BP 3120, Dakar 18524, Senegal.
sidy.diakhate@ird.fr
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