What is stress? Concepts, definitions and applications in seed science

Kranner, Ilse; Minibayeva, Farida; Beckett, Richard P.; Seal, Charlotte E.

doi:10.1111/j.1469-8137.2010.03461.x

Cited by 372 publications

(309 citation statements)

References 159 publications

(345 reference statements)

Supporting

Mentioning

294

Contrasting

Unclassified

Order By: Relevance

“…The activation of genes involved in these mechanisms may arise from external stimuli (Kranner et al, 2010); in this sense, the intensity and duration of dehydration are factors that can influence the capacity of tolerance to seed desiccation.…”

Section: Resultsmentioning

confidence: 99%

Physiological behavior of Genipa americana L. seeds regarding the capacity for desiccation and storage tolerance

et al. 2013

View full text Add to dashboard Cite

-Knowledge of the capacity of desiccation and storage tolerance of seeds is essential to provide adequate conditions necessary to maintain viability after seed collection. Drying rate is one of the factors which have been described as affecting the physiological response of seeds of various species. Literature reports that Genipa americana seeds exhibit an intermediate behavior, quickly losing viability if stored at negative temperatures. Thus, this work aimed to verify the effect of slow drying over the capacity of desiccation and storage tolerance of Genipa americana seeds. Seeds with 47% of water content (recently harvested) were dried over salt solutions until reaching 30%, 20%, 15%, 10% and 5% of water content. After drying to 10% and 5% of water content a reduction in seed viability was observed after 30 days of storage without the total loss of germination after three months in these conditions. The slow drying increased the capacity for desiccation and storage tolerance of the Genipa americana seeds if compared to the information described in literature.Index terms: physiological classification, brazilian forest species, genipapo plants.Comportamento fisiológico de sementes de Genipa americana L.quanto à tolerância à dessecação e ao armazenamento RESUMO -Conhecer a capacidade de tolerância à dessecação e ao armazenamento das sementes tem sido imprescindível para disponibilizar condições adequadas para a manutenção da viabilidade após a coleta. A velocidade de secagem é um dos fatores que tem influenciado na resposta fisiológica das sementes de diversas espécies. Deste modo, buscou-se verificar o efeito da secagem lenta na capacidade de tolerância à dessecação e ao armazenamento das sementes de Genipa americana L. Sementes com 47% de umidade (recém-colhidas) foram secas em soluções salinas até 30, 20, 15, 10 e 5% de umidade, testando-se a viabilidade. Ao atingir 10 e 5% de umidade as sementes foram armazenadas a -20 ºC, avaliando-se a viabilidade a cada 30 dias durante três meses. Sementes recém-colhidas apresentaram 98% de germinação sem perda de viabilidade até 10% de umidade. Sementes secas a 10 e 5% de umidade apresentaram redução na viabilidade após 30 dias de armazenamento, porém não houve a perda total de germinação após este período. A secagem lenta aumentou a capacidade de tolerância à dessecação e ao armazenamento das sementes de Genipa americana se comparada às informações descritas na literatura.Termos para indexação: classificação fisiológica, espécie florestal brasileira, jenipapeiro.

show abstract

Section: Resultsmentioning

confidence: 99%

Physiological behavior of Genipa americana L. seeds regarding the capacity for desiccation and storage tolerance

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Stress may be defined as a negative change in the physiology of a plant away from a reference state, due to the action of an external stress factor or internal stress (see [4][5][6] for more discussion). According to physics, stress refers to an external factor such as temperature while strain is the response of the material [7].…”

Section: What Are Drought Stress and Damage?mentioning

confidence: 99%

“…According to physics, stress refers to an external factor such as temperature while strain is the response of the material [7]. However, the physiology literature generally uses stress in reference to the physiological response [4]. Therefore, we prefer to define stress factors as external and stresses as physiological responses.…”

Section: What Are Drought Stress and Damage?mentioning

confidence: 99%

Drought Adaptation Mechanisms Should Guide Experimental Design

Gilbert¹,

Medina²

2016

Trends in Plant Science

View full text Add to dashboard Cite

The mechanism, or hypothesis, of how a plant might be adapted to drought should strongly influence experimental designs. For instance, an experiment testing for water conservation should be distinct from a damage tolerance evaluation. Here we define four new, general mechanisms for plant adaptation to drought, so that experiments can be more easily designed based upon the definitions. A series of experimental methods are suggested along with appropriate physiological measurements related to the drought adaptation mechanisms. The suggestion is made that the experimental manipulation should match the rate, length, and severity of soil water deficit needed to test the hypothesized type of drought adaptation mechanism.

show abstract

“…Together with drying after priming, low and high temperature, water stress and abscisic acid (ABA) can be used to maintain priming benefits (Lin et al, 2005;Sabehat;Lurie;Weiss, 1998). Drying after priming might work as a cross-tolerance mechanism to activate the seed defense system to subsequent severe stress (Genoud;Metraux, 1999;Kranner et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Cross-Tolerance Mechanism Induction in Melon Seeds by Priming Prior Drying

et al. 2015

View full text Add to dashboard Cite

The loss of benefits after re-drying is one of the drawbacks of the seed priming technique. Different types of stresses have been used before re-drying to preserve the priming benefits. This process may be seen as promoting cross tolerance to increase the defense mechanisms that prevent loss of viability in seeds primed after drying. We tested the effect of some stresses to induce cross-tolerance and different drying conditions with the aim of maintaining priming benefits in melon seeds. The seeds were primed in an aerated KNO 3 solution (0.35M), -1.7MPa, 25 °C, in the dark for six days. The primed seeds were then submitted to slow drying, fast drying, cold shock + slow drying, cold shock + fast drying, heat shock + slow drying, heat shock + fast drying, PEG + slow drying, PEG + fast drying, ABA + slow drying, ABA + fast drying and no drying (planted directly after priming). We evaluated antioxidant enzyme activities (SOD, CAT and APX), germinability, mean time of germination (MTG) and mean rate of germination (MRG). A completely randomized design was used with three repetitions of 50 seeds in each treatment. Data were analyzed by ANOVA and means were compared by the Scott-Knott test (p ≤ 0.05). ABA increased SOD activity after drying and CAT activity was reduced by priming. APX activity was not observed. The stress submission prior to re-drying improved the MRG and reduced MTG. Therefore, the induction of the cross-tolerance mechanism could be effective to maintain priming benefits in melon seeds.Index terms: PEG; priming; dry seeds; antioxidant system. RESUMOA perda dos benefícios do condicionamento, após a ressecagem, é um dos problemas do condicionamento. Para conservar os benefícios, têm sido utilizados diferentes estresses antes da secagem. Esse processo poderia agir como tolerância cruzada, aumentando os mecanismos de defesa, prevenindo a perda de viabilidade em sementes condicionadas após a secagem. Assim, testou-se o efeito de estresses, na tentativa de induzir tolerância cruzada, após diferentes secagens, mantendo os benefícios do condicionamento em sementes de melão. Dessa forma, as sementes foram condicionadas em solução aerada de KNO 3 (0,35M), -1,7 MPa, 25 °C, no escuro, por seis dias. Depois disso, foram submetidas à secagem lenta, rápida, choque de frio + secagem lenta e rápida, choque de calor + secagem lenta e rápida, PEG + secagem lenta e rápida, ABA + secagem lenta e rápida e sementes sem secagem. As sementes não condicionadas foram o controle. Foi avaliada a atividade das enzimas SOD, CAT e APX, germinabilidade, tempo médio de germinação e taxa média de germinação. O delineamento experimental utilizado foi inteiramente casualisado (DIC) com três repetições, contendo 50 sementes para cada tratamento. Para a análise estatística dos dados, foi utilizado ANOVA e as médias comparadas pelo teste de Scott-Knott (p ≤ 0,05). A aplicação de ABA aumentou a atividade da SOD após a secagem e o condicionamento reduziu a atividade da CAT. O estresse inicial, antes da secagem, aumentou-a e reduziu o...

show abstract

What is stress? Concepts, definitions and applications in seed science

Cited by 372 publications

References 159 publications

Physiological behavior of Genipa americana L. seeds regarding the capacity for desiccation and storage tolerance

Physiological behavior of Genipa americana L. seeds regarding the capacity for desiccation and storage tolerance

Drought Adaptation Mechanisms Should Guide Experimental Design

Cross-Tolerance Mechanism Induction in Melon Seeds by Priming Prior Drying

Contact Info

Product

Resources

About