Germination asynchrony is increased by dual seed bank presence in two desert perennial halophytes

Bhatt, Arvind; Bhat, N. R.; Lozano-Isla, Flavio; Gallacher, David; Santo, Andrea; Batista‐Silva, Willian; Fernandes, Denise; Pompelli, Marcelo F.

doi:10.1139/cjb-2019-0071

Cited by 12 publications

(15 citation statements)

References 43 publications

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“…Overall, freshly collected seeds of all the selected species showed high germination percentages and showed similar germination patterns. Higher germination response of freshly collected seeds have been reported previously for these species, believed to be an adaptation strategy that coincides with the rainfall patterns in the Arabian desert (Bhatt et al, 2019a,b,c). In the Arabian desert, most halophytes mature during November–December when temperature is low, and the chances of rainfall are high.…”

Section: Discussionsupporting

confidence: 67%

“…The PCA also confirms that the high germination ability of H. iraquensis is the primary characteristic distinguishing it from other species, while synchrony, without acronym calculated in H. salicornicum is the primary characteristic for the separation of this species from the others. Some scholars recently used PCA as an auxiliary tool to improve the discussion about clustering of species and treatments, involving both seed germination (Bhatt et al, 2019c; Calone et al, 2020; Liu et al, 2020; Wang et al, 2020) and morphophysiological characteristics (dos Santos et al, 2019; Pompelli et al, 2019; Adar et al, 2020; Corte-Real et al, 2020; Prabu et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

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Seed mass, dormancy and germinability variation among maternal plants of four Arabian halophytes

et al. 2022

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Coastal desert vegetation of the Arabian Peninsula is almost entirely dominated by halophytes. Natural populations provide a genetic resource for ecological remediation and may also have direct economic value. High intrapopulation variation of seed traits is presumed to increase population persistence in the unpredictable climatic conditions of this hyper-arid desert. We investigated whether intrapopulation variation of seed mass, dormancy and germinability of four species was attributable to maternal individuals. Arthrocnemum macrostachyum, Halothamnus iraquensis, Haloxylon salicornicum and Seidlitzia rosmarinus are commonly distributed Arabian halophytes with differing seed weight variation. All species exhibited a higher germination when exposed daily to 12 h light, compared to seeds in darkness. A higher germination was correlated with a shorter germination time. For H. iraquensis and S. rosmarinus, a shorter germination time was negatively correlated with germination synchrony. H. salicornicum showed the highest intrapopulation variation of seed traits, followed by A. macrostachyum, S. rosmarinus and H. iraqensis. We found that individuals within populations of all the studied species showed variability in germination but the extent of variation was species-specific. The variation in seed mass and germination among the individuals of the studied species may facilitate a temporal distribution of germination, which may reduce the risk of seed bank exhaustion. The results of this study could assist conservation and management by improving the efficiency of seed collection from wild populations of these species.

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Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Seed mass, dormancy and germinability variation among maternal plants of four Arabian halophytes

et al. 2022

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“…Water is the main abiotic factor limiting seed germination and early seedling growth ( Ansari et al, 2013 ; Bhatt et al, 2020a ). Effects of severe drought stress vary with species, and different taxa may display different adaptation strategies to survive under such stressful events ( Volis and Bohrer, 2013 ; Baskin and Baskin, 2014 ; Miranda et al, 2014 ; Bhatt et al, 2019 ). Evaluating drought tolerance during seed germination could assist with understanding population persistence and community assembly patterns, and how these may be affected by a changing climate.…”

Section: Introductionmentioning

confidence: 99%

Water Stress Inhibits Germination While Maintaining Embryo Viability of Subtropical Wetland Seeds: A Functional Approach With Phylogenetic Contrasts

et al. 2022

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Wetland species commonly exhibit a range of strategies to cope with water stress, either through drought tolerance or through avoidance of the period of limited water availability. Natural populations provide a genetic resource for ecological remediation and may also have direct economic value. We investigated the effects of drought stress on the seed germination of wetland species. Nineteen species were germinated in four concentrations of polyethylene glycol 6000 (PEG) and were evaluated daily (12-h light photoperiod) or after 35 days (continuous darkness) to determine seed germination under water stress. Germination percentage decreased with an increase in polyethylene glycol 6000 (PEG) concentration, but species’ germination response to PEG concentration varied significantly. Seeds recovered their germinability after the alleviation of water stress, but the extent of recovery was species-dependent.

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“…Soil seed bank formation is one of the bed-hedging mechanisms for many species because more or less part of their seeds stay ungerminated in the soil for the future years (Venable and Brown, 1988), especially in ecosystems where opportunities for seedling establishment are unpredictable (Wijayratne and Pyke, 2012;Bhatt et al, 2019). At the same time, speciesspecific differences in the soil seed persistence are known to promote species diversity and co-existence in herbaceous plant communities, as referred to in the storage effect concept (Chesson and Warner, 1981;Warner and Chesson, 1985;Facelli et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Soil Seed Bank Persistence Across Time and Burial Depth in Calcareous Grassland Habitats

Mašková

Poschlod

2022

Front. Plant Sci.

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Seed persistence in the soil is crucial for population dynamics. Interspecific differences in soil seed mortality could be a mechanism that may stimulate species coexistence in herbaceous plant communities. Therefore, understanding the levels and causes of seed persistence is vital for understanding community composition and population dynamics. In this study, we evaluated the burial depth as a significant predictor of the temporal dynamics of soil seed persistence. We suppose that species differ in this temporal dynamics of soil seed persistence according to burial depth. Furthermore, we expected that burial depth would affect soil seed persistence differently concerning the species-specific type of dormancy, light, and fluctuating temperature requirements for germination. Seeds of 28 herbaceous species of calcareous grasslands were buried in the field into depths of 1, 5, and 10 cm under the soil surface. Seed viability was tested by germination and tetrazolium tests several times for three years. Species-specific seed traits—a type of dormancy, light requirements and alternating temperature requirements for germination, and longevity index—were used for disentangling the links behind species-specific differences in soil seed persistence. Our study showed differences in soil seed persistence according to the burial depth at the interspecific level. Generally, the deeper the buried seeds, the longer they stayed viable, but huge differences were found between individual species. Species-specific seed traits seem to be an essential determinant of seed persistence in the soil. Seeds of dormant species survived less and only dormant seeds stayed viable in the soil. Similarly, seeds of species without light or alternating temperature requirements for germination generally remained viable in the soil in smaller numbers. Moreover, seeds of species that require light for germination stayed viable longer in the deeper soil layers. Our results help understand the ecosystem dynamics caused by seed reproduction and highlight the importance of a detailed long-term investigation of soil seed persistence. That is essential for understanding the fundamental ecological processes and could help restore valuable calcareous grassland habitats.

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Germination asynchrony is increased by dual seed bank presence in two desert perennial halophytes

Cited by 12 publications

References 43 publications

Seed mass, dormancy and germinability variation among maternal plants of four Arabian halophytes

Seed mass, dormancy and germinability variation among maternal plants of four Arabian halophytes

Water Stress Inhibits Germination While Maintaining Embryo Viability of Subtropical Wetland Seeds: A Functional Approach With Phylogenetic Contrasts

Soil Seed Bank Persistence Across Time and Burial Depth in Calcareous Grassland Habitats

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