Environmental factors driving seed dormancy and germination in tropical ecosystems: A perspective from campo rupestre species

Garcia, Queila Souza; Barreto, Leilane C.; Bicalho, Elisa Monteze

doi:10.1016/j.envexpbot.2020.104164

Cited by 16 publications

(26 citation statements)

References 92 publications

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“…A similar embryo and germination morphology as described for Trithuria occurs in the autotrophic monocot families Eriocaulaceae, Mayacaceae and Xyridaceae (Baskin and Baskin, 2018). Fresh seeds of various tropical species of Eriocaulaceae and Xyridaceae from the cerrado of Brazil have been reported to be nondormant, that is, no primary dormancy (Garcia et al, 2020;Gonçalves-Magalhães et al, 2020;Oliveira et al, 2021;Zupo et al, 2021). However, seeds of Eriocaulon septangulare from temperate eastern North America were dormant and required cold stratification (1-3°C submerged in water) for germination; they did not come out of dormancy when stored wet (in water) or dry at laboratory temperatures or when stored dry at 1-3°C (Muenscher, 1936).…”

Section: Twelve Subclasses Of Mpdsupporting

confidence: 57%

“…The Bromeliaceae is a monocot family with about 3140 species that is primarily restricted to the Neotropics, and many of the species are epiphytes (Benzing, 2000;Givnish et al, 2014). Seeds of most of the species whose germination has been studied are reported to be nondormant (Smith and Downs, 1974;Tarré et al, 2007;Mantovani and Iglesias, 2008;Pereira et al, 2008Pereira et al, , 2009Silva and Scatena, 2011;Sosa-Luría et al, 2012;Correa and Zotz, 2014;Marques et al, 2014;Rodrigues et al, 2014;Dayrell et al, 2016;Müller et al, 2017;Garcia et al, 2020;de Andrade et al, 2021;Zupo et al, 2021). In many species, the embryo is small, with a low embryo volume:seed volume ratio and a low embryo length:seed length ratio (Smith and Downs, 1974;Benzing, 2000;Baskin and Baskin, unpublished embryo database).…”

Section: Are Seeds Of Bromeliaceae Nondormant or Do They Have Md?mentioning

confidence: 99%

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The great diversity in kinds of seed dormancy: a revision of the Nikolaeva–Baskin classification system for primary seed dormancy

Baskin

2021

Seed Sci. Res.

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This review provides a revised and expanded word-formula system of whole-seed primary dormancy classification that integrates the scheme of Nikolaeva with that of Baskin and Baskin. Notable changes include the following. (1) The number of named tiers (layers) in the classification hierarchy is increased from three to seven. (2) Formulae are provided for the known kinds of dormancy. (3) Seven subclasses of class morphological dormancy are designated: ‘dust seeds’ of mycoheterotrophs, holoparasites and autotrophs; diaspores of palms; and seeds with cryptogeal germination are new to the system. (4) Level non-deep physiological dormancy (PD) has been divided into two sublevels, each containing three types, and Type 6 is new to the system. (5) Subclass epicotyl PD with two levels, each with three types, has been added to class PD. (6) Level deep (regular) PD is divided into two types. (7) The simple and complex levels of class morphophysiological dormancy (MPD) have been expanded to 12 subclasses, 24 levels and 16 types. (8) Level non-deep simple epicotyl MPD with four types is added to the system. (9) Level deep simple regular epicotyl MPD is divided into four types. (10) Level deep simple double MPD is divided into two types. (11) Seeds with a water-impermeable seed coat in which the embryo-haustorium grows after germination (Canna) has been added to the class combinational dormancy. The hierarchical division of primary seed dormancy into many distinct categories highlights its great diversity and complexity at the whole-seed level, which can be expressed most accurately by dormancy formulae.

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Section: Twelve Subclasses Of Mpdsupporting

confidence: 57%

Section: Are Seeds Of Bromeliaceae Nondormant or Do They Have Md?mentioning

confidence: 99%

The great diversity in kinds of seed dormancy: a revision of the Nikolaeva–Baskin classification system for primary seed dormancy

Baskin

2021

Seed Sci. Res.

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“…Temperatures below this range significantly reduced germination percentage and delayed germination. This reduction is an arguably a mechanism to avoid germination during the dry season when temperatures decrease and water is not readily available for seedling establishment (Garcia et al 2020). The negative effect of low temperatures was stronger in shrubs, suggesting that these require higher temperatures to germinate.…”

Section: Herbs and Shrubs Respond Differently To Low And High Tempera...mentioning

confidence: 99%

“…The copyright holder for this preprint this version posted March 24, 2023. ; https://doi.org/10. 1101/2023 The germination ecology of Brazilian rock outcrop vegetations has been previously reviewed (Garcia and Oliveira 2007;Nunes et al 2016;Garcia et al 2020), but these syntheses were restricted to the campo rupestre and focused on the differences in germination responses among some of its most emblematic families (i.e., Asteraceae, Bromeliaceae, Cactaceae, Eriocaulaceae, Melastomataceae, Velloziaceae and Xyridaceae). Still, these syntheses put forward promising hypotheses about the role of seed and germination traits in the ecological dynamics of these plant communities by pointing out that 1) seed traits shape germination responses to abiotic factors and 2) that contrasting microhabitat preferences and geographical ranges derive from distinct germination requirements, as assumed under the regeneration niche hypothesis and the seed ecological spectrum framework (Grubb 1977;Saatkamp et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Seed functional ecology in Brazilian rock outcrop vegetation: an integrative synthesis

Ordóñez‐Parra

Medeiros

Dayrell

et al. 2023

Preprint

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Background and Aims: Rock outcrop vegetation is distributed worldwide and hosts a diverse, specialised, and unique flora that evolved under extremely harsh environmental conditions. The germination ecology in such ecosystems has received little attention, especially regarding the association between seed traits, germination responses and adult plants ecology. Here, we provide a quantitative and meta–analytical review of the seed functional ecology of Brazilian rocky outcrop vegetation, focusing on four vegetation types:campo rupestre,canga,campo de altitudeand inselbergs. Methods: Using a database with functional trait data for 383 taxa and 10,187 germination records for 281 taxa, we calculated the phylogenetic signal of seven seed traits and tested whether they varied among growth forms, geographical distributions, and microhabitats. We also conducted a meta–analysis to understand the effects of light, temperature, and fire–related cues on the germination ofcampo rupestrespecies and how the before mentioned ecological groups and seed mass affect such responses. Key Results: All traits showed a strong phylogenetic signal.Campo rupestrespecies responded positively to light and had optimal germination between 20–30 °C. The effect of temperatures below and above this range was modulated by growth form, with shrubs requiring and tolerating higher temperatures to germinate. We only found evidence of a moderating effect of seed mass for responses to heat shocks, with larger, dormant seeds tolerating heat better. Heat shocks above 200 °C killed seeds, but smoke accelerated germination. No consistent differences in germination responses were found between restricted and widespread species or microhabitats. Still, species from xeric habitats evolved phenological strategies to synchronise germination with higher soil water availability. Conclusions: Evolutionary history plays a major role in the seed ecology of Brazilian rock outcrop vegetation. However, seed traits and germination responses did not explain species geographic distribution and microhabitats, suggesting other traits are more likely to explain such differences.

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“…In supratidal wetlands, soil moisture and salinity induced by groundwater level gradients may be two factors likely to play roles in seed persistence but have received insufficient attention. Generally, soil moisture affects seed persistence by influencing regulation of germination or dormancy ( Rubio-Casal et al, 2003 ; Hu et al, 2018 ; Garcia et al, 2020 ). Kaiser and Pirhofer-Walzl (2015) tested the influence of groundwater level on the seed survival rate of eight wet meadow plant species, and they found that more viable seeds survived at lower groundwater levels compared with higher groundwater levels.…”

Section: Introductionmentioning

confidence: 99%

Rising Shallow Groundwater Level May Facilitate Seed Persistence in the Supratidal Wetlands of the Yellow River Delta

Peng²,

Cui³

et al. 2022

Front. Plant Sci.

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The saline groundwater level of many supratidal wetlands is rising, which is expected to continue into the future because of sea level rise by the changing climate. Plant persistence strategies are increasingly important in the face of changing climate. However, the response of seed persistence to increasing groundwater level and salinity conditions is poorly understood despite its importance for the continuous regeneration of plant populations. Here, we determined the initial seed germinability and viability of seven species from supratidal wetlands in the Yellow River Delta and then stored the seeds for 90 days. The storage treatments consisted of two factors: groundwater level (to maintain moist and saturated conditions) and groundwater salinity (0, 10, 20, and 30 g/L). After retrieval from experimental storage, seed persistence was assessed. We verified that the annuals showed greater seed persistence than the perennials in the supratidal wetlands. Overall, seed persistence was greater after storage in saturated conditions than moist conditions. Salinity positively affected seed persistence under moist conditions. Surprisingly, we also found that higher groundwater salinity was associated with faster germination speed after storage. These results indicate that, once dispersed into habitats with high groundwater levels and high groundwater salinity in supratidal wetlands, many species of seeds may not germinate but maintain viability for some amount of time to respond to climate change.

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Environmental factors driving seed dormancy and germination in tropical ecosystems: A perspective from campo rupestre species

Cited by 16 publications

References 92 publications

The great diversity in kinds of seed dormancy: a revision of the Nikolaeva–Baskin classification system for primary seed dormancy

The great diversity in kinds of seed dormancy: a revision of the Nikolaeva–Baskin classification system for primary seed dormancy

Seed functional ecology in Brazilian rock outcrop vegetation: an integrative synthesis

Rising Shallow Groundwater Level May Facilitate Seed Persistence in the Supratidal Wetlands of the Yellow River Delta

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