The role of temperature in the regulation of seed dormancy and germination.

Probert, R. J.

doi:10.1079/9780851994321.0261

Cited by 333 publications

(314 citation statements)

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“…Under these conditions, it is widely accepted that temperature is an important temporal signal that influences both the induction and loss of seed dormancy, and therefore sensitivity to spatial signals (Probert, 2000;Finch-Savage and Leubner-Metzger, 2006). In general, low temperature (cold stratification) releases seed dormancy of many summer-annual plants, reflecting the loss of dormancy over winter so that germination occurs the following spring (Baskin and Baskin, 1998).…”

Section: Changes In the Dry State (Afterripening)mentioning

confidence: 99%

Seed dormancy is a dynamic state: variable responses to pre- and post-shedding environmental signals in seeds of contrastingArabidopsisecotypes

2015

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Seeds have evolved to be highly efficient environmental sensors that respond not only to their prevailing environment, but also their environmental history, to regulate dormancy and the initiation of germination. In the present work we investigate the combined impact of a number of environmental signals (temperature, nitrate, light) during seed development on the mother plant, during post-shedding imbibition and during prolonged post-shedding exposure in both dry and imbibed states, simulating time in the soil seed bank. The differing response to these environments was observed in contrasting winter (Cvi, Ler) and summer (Bur) annual Arabidopsis ecotypes. Results presented show that environmental signals both pre-and post-shedding determine the depth of physiological dormancy and therefore the germination response to the ambient environment. The ecotype differences in seed response to ambient germination conditions are greatly enhanced by seed maturation in different environments. Further variation in response develops following shedding when seeds do not receive the full complement of environmental signals required for germination and enter the soil seed bank in either dry or imbibed states. Species seed dormancy characteristics cannot therefore be easily defined, as seed dormancy is a dynamic state subject to within-species adaptation to local environments.

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Section: Changes In the Dry State (Afterripening)mentioning

confidence: 99%

Seed dormancy is a dynamic state: variable responses to pre- and post-shedding environmental signals in seeds of contrastingArabidopsisecotypes

2015

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“…Para espécies de clima tropical, com clima úmido, o significado ecológico das alterações no comportamento germinativo durante o armazenamento em condições de baixa umidade é difícil de ser compreendido (Probert, 2001). Em condições naturais, no campo, as sementes de espécies de maracujá silvestres germinam sob alta temperatura, ou seja, durante os meses mais quentes do ano.…”

Section: Tabela 2 Porcentagem De Germinação (Pg) E Viabilidade (V) Dunclassified

Germinação de sementes de Passiflora setacea e dormência induzida pelo armazenamento

Pádua

Schwingel

Mundim

et al. 2011

Rev. bras. sementes

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RESUMO -Objetivou-se nesse trabalho avaliar a germinação inicial de sementes de Passiflora setacea DC com diferentes níveis de umidade e após a conservação sob diferentes temperaturas. Foram utilizados tratamentos pré-germinativos com nitrato de potássio (KNO 3 ) e ácido giberélico (GA 3 ). A germinação foi conduzida em papel germitest embebido em água. O teste de tetrazólio foi empregado para verificar a viabilidade das sementes após os períodos de armazenamento. Foi possível verificar que: (i) as sementes de P. setacea podem ser desidratadas até atingir, aproximadamente 4,7% de água (base úmida) sem perda da capacidade de germinação; (ii) o armazenamento de sementes com baixo teor de água, a baixas temperaturas pode induzir a dormência de sementes de P. setacea; (iii) a dormência é superada pelo tratamento das sementes com ácido giberélico, até o quinto mês de armazenamento; (iv) as sementes conservadas sob temperaturas subzero apresentaram maior porcentagem de viabilidade em relação às armazenadas a 4 °C. Diante destes resultados, pode-se concluir que sementes de P. setacea podem ser conservadas por até 8 meses, sob baixas temperaturas, a -20 ou -196 °C, pois mantêm os padrões mínimos de viabilidade estabelecidos internacionalmente.Termos para indexação: maracujá do mato, viabilidade, conservação, ácido giberélico. GERMINATION OF Passiflora setacea SEEDS AND STORAGE INDUCED DORMANCYABSTRACT -The objective in this study was establish long-term conservation conditions for Passiflora setacea seeds by testing different seed moisture contents and storage temperatures. Seeds were treated with potassium nitrate (KNO 3 ) and gibberellic acid (GA 3 ) before germination in moistened paper towels. Seed viability was verified by the tetrazolium test after the seeds had been treated. It was observed that: (i) P. setacea seeds can be dried to approximately 4.7% of water content (fresh weight basis) without a significant reduction in germination, (ii) low temperatures and low water content induced dormancy in P. setacea seeds; (iii) dormancy could be overcome by seed treatment with gibberellic acid until the fifth month of storage; (iv) seeds maintained at subzero temperatures showed a higher viability compared to those stored at 4 °C. It was concluded that P. setacea seeds can be stored for up to eight months, at -20 or -196 °C, since they maintain the minimum international standards for viability.

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“…However, it has been suggested that, in the mid-continent, the YD was characterized by greater temperature seasonality as a result of increased summer advection of warm air masses from the Caribbean (Schiller et al, 1997;Yu and Wright, 2001;Shuman et al, 2002). Because temperature is an important environmental cue for plant life stages (Angevine and Chabot, 1979;Probert, 2000;Volaire and Norton, 2006;Rohde and Bhalerao, 2007), increased seasonality of temperature could result in greater annual extremes in C 3 /C 4 vegetation on the landscape, resulting in a greater seasonal range of C 3 /C 4 vegetation consumed by leporids.…”

Section: Younger Dryas Variability and Medianmentioning

confidence: 99%

“…Such changes could result from changes in the time of year that certain environmental thresholds are crossed. For example, because temperatures play a large role in timing of germination (Angevine and Chabot, 1979;Probert, 2000), lower overall temperatures could truncate the amount of the year that C 4 plants are capable of growing, shortening the C 4 season relative to the C 3 season.…”

Section: Modeling Variations In Vegetation Seasonalitymentioning

confidence: 99%