Title | Belowground microbes mitigate plant-plant competition |
Publication Type | Journal Article |
Year of Publication | 2017 |
Authors | Fonseca M.B, Dias T., Carolino M.M, Franca M.GC, Cruz C. |
Journal | Plant Science |
Volume | 262 |
Pagination | 175-181 |
Date Published | Sep |
Type of Article | Article |
ISBN Number | 0168-9452 |
Accession Number | WOS:000407407100019 |
Keywords | ARBUSCULAR MYCORRHIZAL FUNGI, Biochemistry & Molecular Biology, Bradyrhizobium sp., competition, Dimorphandra wilsonii, dimorphandra-wilsonii, evolution, growth, mycorrhizal colonization, nitrogen, Plan-plant, Plant Sciences, responses, Rhizodeposition, ROOTS, soil, Urochloa decumbens, water-use efficiency |
Abstract | Dimorphandra wilsonii, a Cerrado endemic Fabaceae tree, is threatened by land-use changes. The few remaining individuals occur in areas dominated by alien grasses like Urochloa decumbens. We tested the impact of nitrogen (N) availability and symbionts' presence on mitigating the effects of competition from U. decumbens. Dimorphandra wilsonii seedlings were 50-week pot-cultivated under limiting (3 mM) or non-limiting (10 mM) N, with or without U. decumbens, and inoculated or not with a N-fixer (Bradyrhizobium sp.) and an arbuscular mycorrhizal fungus (AMF - Glomus etunicatum), both forming symbioses in the field. Since D. wilsonii seedlings grew more and 'lost' fewer nutrients under the symbionts' presence, symbionts mitigated plant-plant competition. Under limiting N, inoculated D. wilsonii seedlings grew more (despite no nodulation), but N fixation was only suggested when inoculated D. wilsonii seedlings competed with U. decumbens. D. wilsonii C-13, and substrate's carbon and respiration suggest that only the microbes performing key functions received plant carbon. Under non-limiting N, inoculated D. wilsonii seedlings became enriched in C-13, substrate accumulated carbon and microbial respiration increased, suggesting a more generalist microbial community. Data suggest inoculating D. wilsonii seeds/seedlings with AMF and N-fixers as a conservation measure. However, long-term field-studies need to confirm these conclusions.
|
Short Title | Plant Sci.Plant Sci. |
Alternate Journal | Plant Sci. |
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Fonseca, Marcia Bacelar Dias, Teresa Carolino, Maria Manuela Costa Franca, Marcel Giovanni Cruz, Cristina
Cruz, Cristina/F-2643-2011
Cruz, Cristina/0000-0003-3100-463X; Carolino, Manuela/0000-0001-8237-6834; Machado Dias, Maria Teresa/0000-0002-5421-4763
Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [2127/09-1]; Fundacao para a Ciencia e a Tecnologia [SFRH/BPD/85419/2012]
The authors thank the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) for support through the PhD grant 2127/09-1 to Marcia Bacelar Fonseca, and Fundacao para a Ciencia e a Tecnologia for support through the Post Doc grant SFRH/BPD/85419/2012 to Teresa Dias. We also thank the Zoo-Botanical Foundation of Belo Horizonte, A. Hayward and S. Houghton for help with the manuscript's preparation. Finally, we are grateful to Prof Erich Grotewold and the anonymous reviewers for the comments and suggestions which greatly improved the present paper.
39
Elsevier ireland ltd
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