Acclimation of seedlings of Gnetum leyboldii Tul. (Gnetaceae) to light changes in a tropical rain forest
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad de Costa Rica
2013
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| _version_ | 1876471590934282240 |
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| author | Gerardo Celis |
| author_facet | Gerardo Celis |
| contents | Acclimation of seedlings of Gnetum leyboldii Tul. (Gnetaceae) to light changes in a tropical rain forest Gerardo Celis Gerardo Avalos Biología lianas Costa Rica germination Gnetum leyboldii biomass allocation The neotropical liana Gnetum leyboldii (Gnetaceae) is a gymnosperm that resembles angiosperms in wood anatomy, overall morphology, and seed dispersal mechanism. Like other woody lianas, seedlings germinate in the shaded forest understory and start climbing towards the canopy, being exposed to sites with extreme differences in light conditions. However, the extent of physiological and structural adjust- ment to contrasting light conditions in the early regeneration stages of Gnetum is unknown. To answer this question, we analyzed seedling growth and photosynthetic responses using a common garden experiment with two light regimes: full sun and low light (20% of full sun) at La Selva Biological Station, Costa Rica. We also characterized the germination pattern of this species. We monitored one and half-month old seedlings for four months. Leaf structure finely adapted to light treatments, but gas exchange properties were buffered by large seed reserves, which dominated biomass distribution (about 50% of the total biomass), followed by stem (27%), leaf (16%) and root biomass (6%) across light conditions. The presence of large seeds and the low photosyn- thetic rates of seedlings in both environments show that G. leyboldii is specialized to exploit deep shade. More research is needed to determine if the patterns found in G. leyboldii are typical of similar lianas that initially exploit deep-shaded understories in their ascension to the canopy. Rev. Biol. Trop. 61 (4): 1859-1868. Epub 2013 December 01. 2013 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44930117023 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.4 Vol.61 |
| format | Artículo científico |
| id | redalyc_44930117023 |
| institution | Redalyc |
| language | en |
| publishDate | 2013 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Acclimation of seedlings of Gnetum leyboldii Tul. (Gnetaceae) to light changes in a tropical rain forest Gerardo Celis Biología lianas Costa Rica germination Gnetum leyboldii biomass allocation Acclimation of seedlings of Gnetum leyboldii Tul. (Gnetaceae) to light changes in a tropical rain forest Gerardo Celis Gerardo Avalos Biología lianas Costa Rica germination Gnetum leyboldii biomass allocation The neotropical liana Gnetum leyboldii (Gnetaceae) is a gymnosperm that resembles angiosperms in wood anatomy, overall morphology, and seed dispersal mechanism. Like other woody lianas, seedlings germinate in the shaded forest understory and start climbing towards the canopy, being exposed to sites with extreme differences in light conditions. However, the extent of physiological and structural adjust- ment to contrasting light conditions in the early regeneration stages of Gnetum is unknown. To answer this question, we analyzed seedling growth and photosynthetic responses using a common garden experiment with two light regimes: full sun and low light (20% of full sun) at La Selva Biological Station, Costa Rica. We also characterized the germination pattern of this species. We monitored one and half-month old seedlings for four months. Leaf structure finely adapted to light treatments, but gas exchange properties were buffered by large seed reserves, which dominated biomass distribution (about 50% of the total biomass), followed by stem (27%), leaf (16%) and root biomass (6%) across light conditions. The presence of large seeds and the low photosyn- thetic rates of seedlings in both environments show that G. leyboldii is specialized to exploit deep shade. More research is needed to determine if the patterns found in G. leyboldii are typical of similar lianas that initially exploit deep-shaded understories in their ascension to the canopy. Rev. Biol. Trop. 61 (4): 1859-1868. Epub 2013 December 01. 2013 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44930117023 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.4 Vol.61 |
| title | Acclimation of seedlings of Gnetum leyboldii Tul. (Gnetaceae) to light changes in a tropical rain forest |
| topic | Biología lianas Costa Rica germination Gnetum leyboldii biomass allocation |
| url | https://www.redalyc.org/articulo.oa?id=44930117023 |