Inter- and intra-population variability in physical dormancy along a precipitation gradient

Ferreras, Ana Elisa; Zeballos, Sebastián Rodolfo; Funes, Guillermo

doi:10.1590/0102-33062016abb0406

Cited by 7 publications

(10 citation statements)

References 23 publications

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“…In the present work, the proportions of seeds that remained dormant were related to the origin of the seeds and the environment in which these had developed. Variations in the dynamics of seed softening (loss of impermeability) have been described previously in other legumes (Ferreras, Zeballos, & Funes, ; Norman, Smith, Nichols, Si, & Galwey, ), including nine genotypes of Desmanthus (Rangel et al., ).…”

Section: Discussionsupporting

confidence: 54%

“…provides them with the possibility of extending seed longevity and persistence in soil seed banks (Gardiner et al, 2004;Hopkinson & English, 2004;Rangel, Henrique, Peter Gardiner, & Lewis Burt, 2015 the environment in which these had developed. Variations in the dynamics of seed softening (loss of impermeability) have been described previously in other legumes (Ferreras, Zeballos, & Funes, 2017;Norman, Smith, Nichols, Si, & Galwey, 2006), including nine genotypes of Desmanthus (Rangel et al, 2015).…”

Section: Discussionmentioning

confidence: 62%

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Variability in hardseededness and seed coat thickness of three populations of Desmanthus virgatus (Fabaceae, Mimosoideae)

Richard

Zabala

Cerino

et al. 2018

Grass and Forage Science

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Desmanthus virgatus (L.) Willd. has significant fodder potential, but its seeds have high and persistent levels of physical dormancy which interfere with its field establishment. The purpose of this study was to analyse the variability of physical dormancy in three populations of seeds from humid and arid regions of Argentina, grown and collected in different years and locations. The hardseededness and the percentage of seeds with intact lenses after a softening treatment and the seed coat thicknesses were compared. The variability observed in the obtained percentages of hardseededness, intact lenses and seed coat thicknesses was related to the origin and the environment in which these seeds had developed. Although further work is needed, arid environments seem to favour the development of thicker seminal layers, being an important factor that determines the impermeable nature of the seeds in this species. This information is required for future genetic improvement programs and for understanding the evolutionary process of the populations of this species in different environments.

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 62%

Variability in hardseededness and seed coat thickness of three populations of Desmanthus virgatus (Fabaceae, Mimosoideae)

Richard

Zabala

Cerino

et al. 2018

Grass and Forage Science

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“…Similar relationship between dormancy and environment as in pea was found by Wagmann et al (2012) studying wild beet seed dormancy release. In contrary, two recent studies of Mediterranean wild lupines (Berger, Shrestha & Ludwig, 2017) and perennial woody legume ( Vachellia aroma ) along a precipitation gradient (Ferreras, Zeballos & Funes, 2017) showed no significant relationship between dormancy release and rainfall or temperature gradients. How could the dormancy-environment pattern we observed in pea be explained?…”

Section: Discussionmentioning

confidence: 74%

Variation in wild pea (Pisum sativumsubsp.elatius) seed dormancy and its relationship to the environment and seed coat traits

Hradilová

Duchoslav

Brus

et al. 2019

PeerJ

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BackgroundSeed germination is one of the earliest key events in the plant life cycle. The timing of transition from seed to seedling is an important developmental stage determining the survival of individuals that influences the status of populations and species. Because of wide geographical distribution and occurrence in diverse habitats, wild pea (Pisum sativum subsp. elatius) offers an excellent model to study physical type of seed dormancy in an ecological context. This study addresses the gap in knowledge of association between the seed dormancy, seed properties and environmental factors, experimentally testing oscillating temperature as dormancy release clue.MethodsSeeds of 97 pea accessions were subjected to two germination treatments (oscillating temperatures of 25/15 °C and 35/15 °C) over 28 days. Germination pattern was described using B-spline coefficients that aggregate both final germination and germination speed. Relationships between germination pattern and environmental conditions at the site of origin (soil and bioclimatic variables extracted from WorldClim 2.0 and SoilGrids databases) were studied using principal component analysis, redundancy analysis and ecological niche modelling. Seeds were analyzed for the seed coat thickness, seed morphology, weight and content of proanthocyanidins (PA).ResultsSeed total germination ranged from 0% to 100%. Cluster analysis of germination patterns of seeds under two temperature treatments differentiated the accessions into three groups: (1) non-dormant (28 accessions, mean germination of 92%), (2) dormant at both treatments (29 acc., 15%) and (3) responsive to increasing temperature range (41 acc., with germination change from 15 to 80%). Seed coat thickness differed between groups with dormant and responsive accessions having thicker testa (median 138 and 140 µm) than non-dormant ones (median 84 mm). The total PA content showed to be higher in the seed coat of dormant (mean 2.18 mg g−1) than those of non-dormant (mean 1.77 mg g−1) and responsive accessions (mean 1.87 mg g−1). Each soil and bioclimatic variable and also germination responsivity (representing synthetic variable characterizing germination pattern of seeds) was spatially clustered. However, only one environmental variable (BIO7, i.e., annual temperature range) was significantly related to germination responsivity. Non-dormant and responsive accessions covered almost whole range of BIO7 while dormant accessions are found in the environment with higher annual temperature, smaller temperature variation, seasonality and milder winter. Ecological niche modelling showed a more localized potential distribution of dormant group. Seed dormancy in the wild pea might be part of a bet-hedging mechanism for areas of the Mediterranean basin with more unpredictable water availability in an otherwise seasonal environment. This study provides the framework for analysis of environmental aspects of physical seed dormancy.

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“…Within a single population some seeds can be soft-seeded and other hard-seeded, even at the time of release (e.g. Hudson et al ., 2015; Ferreras et al ., 2017). Even when all seeds are hard, variability can be present in various forms.…”

Section: Discussionmentioning

confidence: 99%

“…The present study used seeds from distinct localities, but they were probably bulked from at least several plants per locality. Ferreras et al (2017) examined the imbibition of non-treated seeds of Vachellia (Acacia) aroma from four populations (10 to 11 individuals per population) along a precipitation gradient in Argentina. Overall imbibition per population was low (<10%) but in three populations a few individuals had >20% imbibition.…”

Section: Imbibitionnon-treated Seedsmentioning

confidence: 99%

Markedly different patterns of imbibition in seeds of 48 Acacia species

2019

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The seeds of most Australian acacias have pronounced physical dormancy (PY). While fire and hot water (HW) treatments cause the lens to ‘pop’ almost instantaneously, for many Acacia species the increase in germination percentage can be gradual. If PY is broken instantly by HW treatment, why is germination often an extended process? Control and HW treatments were performed on seeds of 48 species of Acacia. Seeds were placed on a moist substrate and imbibition was assessed by frequently weighing individual seeds. In the two soft-seeded species all control seeds were fully imbibed within 6–24 h, while in hard-seeded species very few control seeds imbibed over several weeks. In 10 species over 50% of the HW-treated seeds imbibed within 30 h, but mostly the percentage of imbibed seeds gradually increased over several weeks. Some seeds in a replicate would imbibe early, while others would remain unimbibed for many days or weeks then, remarkably, become fully imbibed in less than 24 h. While HW treatment broke PY almost instantaneously, it appeared that in many Acacia species some other part of the testa slowed water from reaching the embryo. This process of having staggered imbibition may be a way of ensuring not all seeds in a population germinate after small rain events. Thus it appears the lens acts as a ‘fire gauge’ while some other part of the seed coat acts as a ‘rain gauge’.

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Inter- and intra-population variability in physical dormancy along a precipitation gradient

Cited by 7 publications

References 23 publications

Variability in hardseededness and seed coat thickness of three populations of Desmanthus virgatus (Fabaceae, Mimosoideae)

Variability in hardseededness and seed coat thickness of three populations of Desmanthus virgatus (Fabaceae, Mimosoideae)

Variation in wild pea (Pisum sativumsubsp.elatius) seed dormancy and its relationship to the environment and seed coat traits

Markedly different patterns of imbibition in seeds of 48 Acacia species

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