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Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa
Potential ecophysiological responses to nitrogen deposition, which is considered to be one of the leading causes for global biodiversity loss, were studied for the endangered endemic Mexican epiphytic orchid, Laelia speciosa, via a shadehouse dose-response experiment (doses were 2.5, 5, 10, 20, 40,...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
PeerJ Inc.
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4485242/ https://www.ncbi.nlm.nih.gov/pubmed/26131375 http://dx.doi.org/10.7717/peerj.1021 |
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author | Díaz-Álvarez, Edison A. Lindig-Cisneros, Roberto de la Barrera, Erick |
author_facet | Díaz-Álvarez, Edison A. Lindig-Cisneros, Roberto de la Barrera, Erick |
author_sort | Díaz-Álvarez, Edison A. |
collection | PubMed |
description | Potential ecophysiological responses to nitrogen deposition, which is considered to be one of the leading causes for global biodiversity loss, were studied for the endangered endemic Mexican epiphytic orchid, Laelia speciosa, via a shadehouse dose-response experiment (doses were 2.5, 5, 10, 20, 40, and 80 kg N ha(−1) yr(−1)) in order to assess the potential risk facing this orchid given impending scenarios of nitrogen deposition. Lower doses of nitrogen of up to 20 kg N ha yr(−1), the dose that led to optimal plant performance, acted as fertilizer. For instance, the production of leaves and pseudobulbs were respectively 35% and 36% greater for plants receiving 20 kg N ha yr(−1) than under any other dose. Also, the chlorophyll content and quantum yield peaked at 0.66 ± 0.03 g m(−2) and 0.85 ± 0.01, respectively, for plants growing under the optimum dose. In contrast, toxic effects were observed at the higher doses of 40 and 80 kg N ha yr(−1). The δ(13)C for leaves averaged −14.7 ± 0.2‰ regardless of the nitrogen dose. In turn, δ(15)N decreased as the nitrogen dose increased from 0.9 ± 0.1‰ under 2.5 kg N ha(−1)yr(−1) to −3.1 ± 0.2‰ under 80 kg N ha(−1)yr(−1), indicating that orchids preferentially assimilate NH(4)(+) rather than NO(3)(−) of the solution under higher doses of nitrogen. Laelia speciosa showed a clear response to inputs of nitrogen, thus, increasing rates of atmospheric nitrogen deposition can pose an important threat for this species. |
format | Online Article Text |
id | pubmed-4485242 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | PeerJ Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-44852422015-06-30 Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa Díaz-Álvarez, Edison A. Lindig-Cisneros, Roberto de la Barrera, Erick PeerJ Ecology Potential ecophysiological responses to nitrogen deposition, which is considered to be one of the leading causes for global biodiversity loss, were studied for the endangered endemic Mexican epiphytic orchid, Laelia speciosa, via a shadehouse dose-response experiment (doses were 2.5, 5, 10, 20, 40, and 80 kg N ha(−1) yr(−1)) in order to assess the potential risk facing this orchid given impending scenarios of nitrogen deposition. Lower doses of nitrogen of up to 20 kg N ha yr(−1), the dose that led to optimal plant performance, acted as fertilizer. For instance, the production of leaves and pseudobulbs were respectively 35% and 36% greater for plants receiving 20 kg N ha yr(−1) than under any other dose. Also, the chlorophyll content and quantum yield peaked at 0.66 ± 0.03 g m(−2) and 0.85 ± 0.01, respectively, for plants growing under the optimum dose. In contrast, toxic effects were observed at the higher doses of 40 and 80 kg N ha yr(−1). The δ(13)C for leaves averaged −14.7 ± 0.2‰ regardless of the nitrogen dose. In turn, δ(15)N decreased as the nitrogen dose increased from 0.9 ± 0.1‰ under 2.5 kg N ha(−1)yr(−1) to −3.1 ± 0.2‰ under 80 kg N ha(−1)yr(−1), indicating that orchids preferentially assimilate NH(4)(+) rather than NO(3)(−) of the solution under higher doses of nitrogen. Laelia speciosa showed a clear response to inputs of nitrogen, thus, increasing rates of atmospheric nitrogen deposition can pose an important threat for this species. PeerJ Inc. 2015-06-23 /pmc/articles/PMC4485242/ /pubmed/26131375 http://dx.doi.org/10.7717/peerj.1021 Text en © 2015 Díaz-Álvarez et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. |
spellingShingle | Ecology Díaz-Álvarez, Edison A. Lindig-Cisneros, Roberto de la Barrera, Erick Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa |
title | Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa |
title_full | Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa |
title_fullStr | Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa |
title_full_unstemmed | Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa |
title_short | Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa |
title_sort | responses to simulated nitrogen deposition by the neotropical epiphytic orchid laelia speciosa |
topic | Ecology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4485242/ https://www.ncbi.nlm.nih.gov/pubmed/26131375 http://dx.doi.org/10.7717/peerj.1021 |
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