Seed responses to temperature indicate different germination strategies among Festuca pallescens populations from semi-arid environments in North Patagonia

López, Aldana Soledad; Marchelli, Paula; Batlla, Diego; López, Diana María; Arana, María Verónica

doi:10.1016/j.agrformet.2019.04.002

Cited by 13 publications

(21 citation statements)

References 45 publications

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“…However, the optimal response to temperature cues may vary with climate among populations. Although clinal within‐species variation in dormancy and germination traits is often reported (Montesinos‐Navarro et al., ; Vidigal et al., ; Barga et al., ; Fernández‐Pascual et al., ; Hernández et al., ; López et al., ), fewer studies have examined intraspecific variation in seed chilling responses, particularly across climatic gradients (Cavieres and Arroyo, ; Debieu et al., ; Rubin and Friedman, ). Our results demonstrate extensive variation in stratification (chilling) requirements and ambient temperature responses in S. tortuosus populations across elevation.…”

Section: Discussionmentioning

confidence: 99%

Variation in the seasonal germination niche across an elevational gradient: the role of germination cueing in current and future climates

Gremer

Chiono

Suglia

et al. 2020

American J of Botany

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Premise The timing of germination has profound impacts on fitness, population dynamics, and species ranges. Many plants have evolved responses to seasonal environmental cues to time germination with favorable conditions; these responses interact with temporal variation in local climate to drive the seasonal climate niche and may reflect local adaptation. Here, we examined germination responses to temperature cues in Streptanthus tortuosus populations across an elevational gradient. Methods Using common garden experiments, we evaluated differences among populations in response to cold stratification (chilling) and germination temperature and related them to observed germination phenology in the field. We then explored how these responses relate to past climate at each site and the implications of those patterns under future climate change. Results Populations from high elevations had stronger stratification requirements for germination and narrower temperature ranges for germination without stratification. Differences in germination responses corresponded with elevation and variability in seasonal temperature and precipitation across populations. Further, they corresponded with germination phenology in the field; low‐elevation populations germinated in the fall without chilling, whereas high‐elevation populations germinated after winter chilling and snowmelt in spring and summer. Climate‐change forecasts indicate increasing temperatures and decreasing snowpack, which will likely alter germination cues and timing, particularly for high‐elevation populations. Conclusions The seasonal germination niche for S. tortuosus is highly influenced by temperature and varies across the elevational gradient. Climate change will likely affect germination timing, which may cascade to influence trait expression, fitness, and population persistence.

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Section: Discussionmentioning

confidence: 99%

Variation in the seasonal germination niche across an elevational gradient: the role of germination cueing in current and future climates

Gremer

Chiono

Suglia

et al. 2020

American J of Botany

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“…Seeds are therefore likely to germinate only when a prolonged wet period occurs, precluding germination after a short pulse of rain (e.g., during summer dispersion). Autumn germination is thus likely, favoring subsequent seedling survival, as reported for several perennial species 32 , 37 , 51 , 53 . In addition, high values of θ (50) (thermal time) and σ θ (deviation of thermal time) 37 indicate that the seeds of these populations also require the accumulation of more °C days for germination.…”

Section: Discussionmentioning

confidence: 77%

“…The petri dishes were sealed with plastic film to prevent moisture loss. In order to keep the water potential of the incubation medium constant during germination experiments, the filter papers and PEG solutions were changed every 48 h. The experiment was run in a germination chamber, in darkness, at a constant temperature of 15.5 °C, since this temperature was estimated as optimal for the species 37 . A seed was considered germinated on protrusion of the radicle.…”

Section: Methodsmentioning

confidence: 99%

“…The time-course cumulative germination curves obtained for seeds incubated under the four water potentials were used to estimate the time required to complete the germination of the subpopulation percentiles (5–90%). The accumulated germination data was adjusted using the Gompertz equation, and the germination rate was calculated in the same way as for the thermal time model 37 . The germination rate of a given fraction g of the population (GR (g) ) is linearly related to the water potential 18 , 19 ; therefore, for each fraction of the population, a linear regression of GR (g) was fitted to define the ψb (g) of each fraction as the interception of the ψ axis when GR (g) = 0.…”

Section: Methodsmentioning

confidence: 99%

“…Populations of F. pallescens showed marked differences in seed sensitivity to temperature. Using a thermal time approach 37 , we found that the minimum temperature for germination (Tb = − 0.47 ± 0.19 °C) did not differ among populations. However, the thermal time required for germination varied significantly among populations from different environments, being higher in xeric than in humid environments (213.7 °Cd vs 144.24 °Cd, respectively).…”

Section: Introductionmentioning

confidence: 91%

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Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters

López

López²,

Arana

et al. 2021

Sci Rep

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Sensitivity to water availability is a key physiological trait for grassland species located in arid and semiarid environments, where successful germination is closely related to rainfall dynamics. Festuca pallescens inhabits diverse environments along a steep precipitation gradient in North Patagonia, thus offering a suitable model for the study of germination behavior in response to water availability. By analyzing germination in nine populations using a hydrotime model approach, we aimed to find within-species variation. Seed population behavior was analyzed under different hydric conditions using hydrotime model parameters (hydrotime, mean base water potential and its standard deviation). We estimated the mean base water potential for F. pallescens (ψb(50) = − 2.79 ± 0.45 MPa), which did not differ significantly between populations. However, the hydrotime parameter (θH) varied markedly, suggesting physiological adaptation to local environments. Higher values of θH were found in populations located at the extremes of the distribution gradient, indicating that germination may be prevented or delayed in conditions that are suboptimal for the species. Since the variation in hydrotime model parameters did not follow a cline, micro-environmental cues may have the greatest influence on the physiological behavior of the species, rather than the macroscale rainfall gradient.

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Do populations of Festuca pallescens from a rainfall gradient differ in the expression of morpho-physiological traits under drought stress?

López

López²,

Caballé

et al. 2023

Environmental and Experimental Botany

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Seed responses to temperature indicate different germination strategies among Festuca pallescens populations from semi-arid environments in North Patagonia

Cited by 13 publications

References 45 publications

Variation in the seasonal germination niche across an elevational gradient: the role of germination cueing in current and future climates

Variation in the seasonal germination niche across an elevational gradient: the role of germination cueing in current and future climates

Germination response to water availability in populations of Festuca pallescens along a Patagonian rainfall gradient based on hydrotime model parameters

Do populations of Festuca pallescens from a rainfall gradient differ in the expression of morpho-physiological traits under drought stress?

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