Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia
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| Format: | Online |
| Language: | eng |
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Universidad de Costa Rica
2018
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| Online Access: | https://revistas.ucr.ac.cr/index.php/rbt/article/view/33423 |
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RBT33423 |
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| record_format |
ojs |
| institution |
Universidad de Costa Rica |
| collection |
Revista de Biología Tropical |
| language |
eng |
| format |
Online |
| author |
Vargas-Figueroa, Jhon Alexander Torres-González, Alba Marina |
| spellingShingle |
Vargas-Figueroa, Jhon Alexander Torres-González, Alba Marina Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia |
| author_facet |
Vargas-Figueroa, Jhon Alexander Torres-González, Alba Marina |
| author_sort |
Vargas-Figueroa, Jhon Alexander |
| title |
Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia |
| title_short |
Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia |
| title_full |
Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia |
| title_fullStr |
Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia |
| title_full_unstemmed |
Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia |
| title_sort |
germination and seed conservation of a pioneer species, tecoma stans (bignoniaceae), from tropical dry forest of colombia |
| publisher |
Universidad de Costa Rica |
| publishDate |
2018 |
| url |
https://revistas.ucr.ac.cr/index.php/rbt/article/view/33423 |
| work_keys_str_mv |
AT vargasfigueroajhonalexander germinationandseedconservationofapioneerspeciestecomastansbignoniaceaefromtropicaldryforestofcolombia AT torresgonzalezalbamarina germinationandseedconservationofapioneerspeciestecomastansbignoniaceaefromtropicaldryforestofcolombia |
| _version_ |
1810115231667453952 |
| spelling |
RBT334232022-06-09T18:14:13Z Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia Vargas-Figueroa, Jhon Alexander Torres-González, Alba Marina secondary dormancy phytochrome soil seed bank seed storage behavior ex situ conservation climate change. Seed germination and seed longevity under different environmental conditions are fundamental to understand the ecological dynamics of a species, since they are decisive for its success within the ecosystem. Taking this into account, seed germination and seed storage behavior of a pioneer species of tropical dry forest (Tecoma stans) were studied in the laboratory, to establish the effect of different environmental conditions on a local tree population. Two seed lots collected in July 2011, from Cali (Colombia), were evaluated under three alternating temperatures (20/30, 20/25, 25/30 ºC; 16/8 h) and four light qualities (12-hour white light photoperiod, darkness, and 15 minutes of red light -R and far red light -FR). Final germination was recorded for all treatments; for white light treatment the daily germination was recorded to calculate mean germination rate, mean germination time, and two synchronization indices. To assess the effect of light quality on physiological variables, a destructive germination test was carried out. For this test, another seed lot was evaluated under the same light conditions using an alternating temperature of 20/30 °C - 16/8 h, recording germination during six days for every treatment. In addition, seeds were stored at two different moisture contents (7.7, 4.1 %) and three storage temperatures (20, 5, -20 ºC), during two time periods (one and three months); a seed germination test was conducted for each treatment. Four replicates of 35 seeds per treatment were used for all experiments. Germination was high (GP > 90 %) with all alternating temperatures under white light, whereas under R, FR, and darkness germination was evenly successful at low temperatures, but at higher temperature, half of the seeds entered into secondary dormancy (GP= 45-65 %). However, mean germination rate and synchronization under R and FR decreased significantly in comparison to white light treatment and, consequently, mean germination time increased. Seed storage behavior of this species is orthodox due to the high germination (GP > 90 %) obtained under all treatments. In conclusion, T. stans seeds have a negative germination response at high incubation temperatures in the absence of white light, entering into a secondary dormancy. In contrast, an environment with a lower temperature and without white light delays the germination, but at the end seeds are able to reach the same germination values. This seed dependence on incident light in limiting conditions suggests a physiological mechanism on the seed tissues of this species, probably mediated by phytochromes. Finally, the orthodox seed storage behavior of T. stans is a reason to include this species in ex situ seed conservation programs for restoration and recovery of the tropical dry forest; however, long-term studies should be conducted in order to evaluate the maintenance of this characteristic throughout longer periods of time. Rev. Biol. Trop. 66(2): 918-936. Epub 2018 June 01. Universidad de Costa Rica 2018-06-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article application/pdf text/html https://revistas.ucr.ac.cr/index.php/rbt/article/view/33423 10.15517/rbt.v66i2.33423 Revista de Biología Tropical; Vol. 66 No. 2 (2018): Volume 66 – Regular number 2 – June 2018; 918–936 Revista de Biología Tropical; Vol. 66 Núm. 2 (2018): Volumen 66 – Número regular 2 – Junio 2018; 918–936 Revista Biología Tropical; Vol. 66 N.º 2 (2018): Volume 66 – Regular number 2 – June 2018; 918–936 2215-2075 0034-7744 10.15517/rbt.v66i2 eng https://revistas.ucr.ac.cr/index.php/rbt/article/view/33423/32891 https://revistas.ucr.ac.cr/index.php/rbt/article/view/33423/32928 Copyright (c) 2018 Revista de Biología Tropical http://creativecommons.org/licenses/by/4.0 |