2015
Díaz-Álvarez, E. A.; Lindig-Cisneros, R.; de la Barrera, E.
Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa Journal Article
In: PeerJ, vol. 3, pp. e1021, 2015.
Abstract | Links | BibTeX | Tags: acid rain, biodiversity, CAM, conservation physiology, d15N, global change, Laelia, neotropical, nitrogen, orchid, plant nutrition, pollution, stable isotopes
@article{Díaz-Álvarez2015,
title = {Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa},
author = {E. A. Díaz-Álvarez and R. Lindig-Cisneros and E. de la Barrera},
url = {https://peerj.com/articles/1021/
http://agro.mx/wp-content/uploads/2015/06/031-Díaz-Alvarez-et-al-2015-PeerJ-Laelia.pdf},
doi = {10.7717/peerj.1021},
year = {2015},
date = {2015-06-18},
journal = {PeerJ},
volume = {3},
pages = {e1021},
abstract = {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 δ13C for leaves averaged –14.7 ± 0.2‰ regardless of the nitrogen dose. In turn, δ15N 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 NH4+ rather than NO3– 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.},
keywords = {acid rain, biodiversity, CAM, conservation physiology, d15N, global change, Laelia, neotropical, nitrogen, orchid, plant nutrition, pollution, stable isotopes},
pubstate = {published},
tppubtype = {article}
}
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 δ13C for leaves averaged –14.7 ± 0.2‰ regardless of the nitrogen dose. In turn, δ15N 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 NH4+ rather than NO3– 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.