Alternating temperature combined with darkness resets base temperature for germination (Tb) in photoblastic seeds of Lippia and Aloysia (Verbenaceae)

Galíndez, Guadalupe; Seal, Charlotte E.; Daws, Matthew I.; Lindow, Lucía; Ortega–Baes, Pablo; Pritchard, Hugh W.

doi:10.1111/plb.12449

Cited by 24 publications

(15 citation statements)

References 25 publications

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“…Such models should also account for germination rate dependency on precipitation loss and gain (e.g. hydro-time; Stevens et al, 2014), and the effect of environmental temperatures that alternate and transgress thermal thresholds to reveal whether temperature shifts per se have an effect on germination (Fern andez-Pascual et al, 2015;Galindez et al, 2017;Murdoch, Roberts, & Goedert, 1989). Identifying species which will be overall winners and losers of climate change throughout their entire life cycle is complex.…”

Section: Germination Phenotype and The Environmentmentioning

confidence: 99%

Thermal buffering capacity of the germination phenotype across the environmental envelope of the Cactaceae

Seal

Daws

Flores

et al. 2017

Global Change Biology

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Recruitment from seeds is among the most vulnerable stage for plants as global temperatures change. While germination is the means by which the vast majority of the world's flora regenerate naturally, a framework for accurately predicting which species are at greatest risk of germination failure during environmental perturbation is lacking. Taking a physiological approach, we assess how one family, the Cactaceae, may respond to global temperature change based on the thermal buffering capacity of the germination phenotype. We selected 55 cactus species from the Americas, all geo-referenced seed collections, reflecting the broad environmental envelope of the family across 70° of latitude and 3700 m of altitude. We then generated empirical data of the thermal germination response from which we estimated the minimum (T ), optimum (T ) and ceiling (T ) temperature for germination and the thermal time (θ ) for each species based on the linearity of germination rate with temperature. Species with the highest T and lowest T germinated fastest, and the interspecific sensitivity of the germination rate to temperature, as assessed through θ , varied tenfold. A left-skewed asymmetry in the germination rate with temperature was relatively common but the unimodal pattern typical of crop species failed for nearly half of the species due to insensitivity to temperature change at T . For 32 fully characterized species, seed thermal parameters correlated strongly with the mean temperature of the wettest quarter of the seed collection sites. By projecting the mean temperature of the wettest quarter under two climate change scenarios, we predict under the least conservative scenario (+3.7°C) that 25% of cactus species will have reduced germination performance, whilst the remainder will have an efficiency gain, by the end of the 21st century.

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Section: Germination Phenotype and The Environmentmentioning

confidence: 99%

Thermal buffering capacity of the germination phenotype across the environmental envelope of the Cactaceae

Seal

Daws

Flores

et al. 2017

Global Change Biology

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“…Seeds of many Burseraceae are reported to have PD or to be non dormant (Baskin and Baskin 2014). Limited information is available in the literature on seed germination requirements of Lippia species (but see Galíndez et al 2016)and most of the study took a common garden approach, with seeds Fig. 4 Key issues identified for the main phases of seed conservation and propagation of useful plants in Mexico.…”

Section: Seed Dormancy As An Issue For Plant Propagationmentioning

confidence: 99%

Conserving seeds of useful wild plants in Mexico: main issues and recommendations

Rodríguez‐Arévalo

Mattana

García

et al. 2016

Genet Resour Crop Evol

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The efficient storage and germination of seeds underpin the effective use of plants for livelihoods and sustainable development. A total of 204 wild species useful for local communities of the Tehuacán-Cuicatlán Valley were collected and stored in seed banks in country for long term conservation, and 66 % (i.e., 134) duplicated in the U.K., as an effective means of ex situ conservation. Of the 204 species, 147 (122 of which also duplicated in the U.K.) were previously listed as useful plants in the ethnofloristic inventory of the Valley. Based on literature surveys, we found that one of the major impediments to the use of stored seeds of wild species is the lack of knowledge of how to germinate the seed. In detailed studies, we found that seeds of 18 useful plant species from 10 different families germinated readily and could be propagated. In contrast, four species (Actinocheita filicina, Bursera submoniliformis, Karwinskia mollis and Lippia graveolens) produced dormant seeds and therefore further studies are needed before their use can be maximised in large scale propagation programmes in support of conservation and livelihoods. Overall, this large-scale study on useful wild plant species in Mexico confirms that conventional seed banking can effectively support sustainable development and livelihood programmes.

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“…; Galíndez et al . ). For this reason, although some authors consider the base temperature a constant for a seed lot (García‐Huidobro et al .…”

Section: Introductionmentioning

confidence: 97%

“…), others find that it presents plasticity, depending on the seed's surrounding environment (Galíndez et al . ).…”

Section: Introductionmentioning

confidence: 97%

Plant attributes and their relationship to the germination response to different temperatures of 18 species from central Mexico

et al. 2018

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Germination responses of non-dormant seeds to temperature and thermal requirements are affected by the geoclimatic origin of the species, along with specific attributes such as life form, life cycle or seed size. We evaluated the relationship of these attributes and temperature to germination in 18 species that inhabit a convergence area of two biogeographic realms. Seeds were sown at different constant temperatures. Base temperature (T ) and thermal time for 50% germination (θ ) were determined. For T , θ and seed size, we performed a cluster analysis and then applied a discriminant analysis (DA). DA was also performed using geoclimatic origin, life form and life cycle as grouping variables. Seed that did not germinate were transferred to the benefit temperature for germination. Finally, ethylene was applied to the remaining seeds that did not germinate. Temperature significantly affected final germination. T varied between 5 and 13 °C in 15 species and 19.0-21.5 °C in the remainder; θ was 7-30 °Cd in eight species and 50-109 °Cd in the remainder. Cluster analysis showed three groups, and DA evidenced the relevance of T and θ for this separation. Differences in life cycle were related to θ . The geoclimatic origin was not significant. Thermoinhibition or thermodormancy were found in some species. T overlaps with environmental temperature of the growth season. Thermal traits for germination mainly reflect the species' life cycle, which is related to the main differences in reproductive performance among annuals and perennials. Local adaptation might mask the effect of geoclimatic origin of a species.

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Alternating temperature combined with darkness resets base temperature for germination (T_b) in photoblastic seeds of Lippia and Aloysia (Verbenaceae)

Cited by 24 publications

References 25 publications

Thermal buffering capacity of the germination phenotype across the environmental envelope of the Cactaceae

Thermal buffering capacity of the germination phenotype across the environmental envelope of the Cactaceae

Conserving seeds of useful wild plants in Mexico: main issues and recommendations

Plant attributes and their relationship to the germination response to different temperatures of 18 species from central Mexico

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