Seed germination and dormancy of Miconia chartacea (Melastomataceae) in response to light, temperature and plant hormones.

Escobar, Diego Fernando Escobar; Cardoso, Victor José Mendes

doi:10.15517/rbt.v63i4.17955

Cited by 7 publications

(2 citation statements)

References 39 publications

(84 reference statements)

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“…The first factor could control the temporal variation in germination while the light could control the spatial one, as it has been proposed for others species of dry ecosystems (e.g. Escobar & Cardoso, 2015).…”

Section: Discussionmentioning

confidence: 99%

Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia

Vargas-Figueroa

Torres-González

2018

RBT

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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.

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Section: Discussionmentioning

confidence: 99%

Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia

Vargas-Figueroa

Torres-González

2018

RBT

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“…Seeds that respond differentially to light are known as photoblastic [26,34]. Within this group, some species are inhibited by varying proportions of the red/far-red ratio or by the presence of darkness [23,[35][36][37]. The germination response to light is linked to the environmental preferences of each species and may indicate their ecological niche.…”

Section: Introductionmentioning

confidence: 99%

Linking Seed Traits and Germination Responses in Caribbean Seasonally Dry Tropical Forest Species

Londoño-Lemos,

Torres-Gonzáles,

Madriñán

2024

Plants

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Understanding the relationships between seed traits and germination responses is crucial for assessing natural regeneration, particularly in threatened ecosystems like the seasonally dry tropical forest (SDTF). This study explored links between seed traits (mass, volume, moisture content, and dispersal type), germination responses (germinability, germination speed (v¯), time to 50% of germination (T50), synchrony, and photoblastism), and physical dormancy (PY) in 65 SDTF species under experimental laboratory conditions. We found that species with smaller seeds (low mass and volume) had higher v¯ and reached T50 faster than species with larger seeds. For moisture content, species with lower moisture content had higher germinability and reached the T50 faster than seeds with high moisture content. Abiotic dispersed species germinated faster and reached the T50 in fewer days. Most of the SDTF species (60%) did not present PY, and the presence of PY was associated with seeds with lower moisture content. As for photoblastism (germination sensitivity to light), we classified the species into three ecological categories: generalists (42 species, non-photoblastic), heliophytes (18 species, positive photoblastic, germination inhibited by darkness), and sciadophytes (5 species, negative photoblastic, light inhibited germination). This study intends to be a baseline for the study of seed ecophysiology in the SDTF.

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Seed Germination Ecology in Neotropical Melastomataceae: Past, Present, and Future

Ordóñez‐Parra

Messeder²,

Mancipe-Murillo³

et al. 2022

Systematics, Evolution, and Ecology of Melastomataceae

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Seed germination and dormancy of Miconia chartacea (Melastomataceae) in response to light, temperature and plant hormones.

Cited by 7 publications

References 39 publications

Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia

Germination and seed conservation of a pioneer species, Tecoma stans (Bignoniaceae), from tropical dry forest of Colombia

Linking Seed Traits and Germination Responses in Caribbean Seasonally Dry Tropical Forest Species

Seed Germination Ecology in Neotropical Melastomataceae: Past, Present, and Future

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