Biological glasses: nature's way to preserve life

Buitink, Julia

doi:10.1016/s1095-6433(00)80036-7

Cited by 8 publications

(7 citation statements)

References 158 publications

(801 reference statements)

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“…In dry biological tissues, glasses retain the activity of enzymes and conformation of proteins and play a role in the long-term storage stability of seeds [32]. The replacement of water with the abovementioned oligosaccharides during desiccation also maintains the hydrogen bonds required for membrane and protein stabilization [11,21].…”

Section: Metabolic Shut-downmentioning

confidence: 99%

What Do We Know About the Genetic Basis of Seed Desiccation Tolerance and Longevity?

Kijak

Ratajczak

2020

IJMS

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Long-term seed storage is important for protecting both economic interests and biodiversity. The extraordinary properties of seeds allow us to store them in the right conditions for years. However, not all types of seeds are resilient, and some do not tolerate extreme desiccation or low temperature. Seeds can be divided into three categories: (1) orthodox seeds, which tolerate water losses of up to 7% of their water content and can be stored at low temperature; (2) recalcitrant seeds, which require a humidity of 27%; and (3) intermediate seeds, which lose their viability relatively quickly compared to orthodox seeds. In this article, we discuss the genetic bases for desiccation tolerance and longevity in seeds and the differences in gene expression profiles between the mentioned types of seeds.

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Section: Metabolic Shut-downmentioning

confidence: 99%

What Do We Know About the Genetic Basis of Seed Desiccation Tolerance and Longevity?

Kijak

Ratajczak

2020

IJMS

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“…In the first group are factors that preserve the integrity of membranes and macromolecules in the dry state, and maintain essential spatial relationships within the cytoplasm; this must include ability of cell walls to shrink or fold without strain as the cytoplasm loses volume on drying. Control must also be maintained over the relative rates and integration of metabolic processes during drying and remoistening; vitrification of the cell contents as water is lost may be important in achieving all of these needs (Crowe et al ., 1998; Buitink, 2000; Buitink et al ., 2002). The second group includes larger‐scale structural adaptations, and, for example, metabolic protection against oxidative damage (Smirnoff, 1993; Foyer et al ., 1994; Alscher et al ., 1997) – important to all plants, but a hazard often assumed as likely to bear more heavily on DT plants during drying and recovery.…”

Section: Anatomical and Physiological Requirements And Implicatiomentioning

confidence: 99%

Poikilohydry and homoihydry: antithesis or spectrum of possibilities?

2002

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SummaryPlants have followed two principal (and contrasting) strategies of adaptation to the irregular supply of water on land, which are closely bound up with scale. Vascular plants evolved internal transport from the soil to the leafy canopy (but their 'homoihydry' is far from absolute, and some are desiccation tolerant (DT)). Bryophytes depended on desiccation tolerance, suspending metabolism when water was not available; their cells are generally either fully turgid or desiccated. Desiccation tolerance requires preservation intact through drying-re-wetting cycles of essential cell components and their functional relationships, and controlled cessation and restarting of metabolism. In many bryophytes and some vascular plants tolerance is essentially constitutive. In other vascular plants (particularly poikilochlorophyllous species) and some bryophytes tolerance is induced by water stress. Desiccation tolerance is adaptively optimal on hard substrates impenetrable to roots, and on poor dry soils in seasonally dry climates. DT vascular plants are commonest in warm semiarid climates; DT mosses and lichens occur from tropical to polar regions. DT plants vary widely in their inertia to changing water content. Some mosses and lichens dry out and recover within an hour or less; vascular species typically respond on a time scale of one to a few days.© New Phytologist (2002) 156 :

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“…O autor constatou que a tolerância à temperatura de 50C foi adquirida gradativamente, à medida que as sementes perderam água na pré-secagem a 35°C. Buitink (2000) investigando a composição de açúcares após "priming" em sementes de ervilha e nas propriedades intracelulares do "vidro" no citoplasma, não constatou a hipótese de que os oligossacarídeos estabilizam o vidro intracelular, pela diminuição da mobilidade molecular. Aparentemente outras moléculas além dos açúcares solúveis tem uma função importante na formação de vidro intracelular.…”

Section: Resultsunclassified

“…Organismos tolerantes à dessecação, tais como sementes e pólen, são capazes de sobreviverem à remoção da maior parte de sua água celular, sendo também capazes de sobreviverem por longos períodos no estado seco (Buitink, 2000).…”

Section: Introductionunclassified

“…É importante salientar que o conteúdo de água no qual ocorre a formação de vidro durante a secagem de sementes a temperatura ambiente é muito mais baixo que o conteúdo crítico de água das espécies mais sensíveis à dessecação. Aparentemente os danos induzidos pela desidratação nessas sementes ocorrem num conteúdo de água bem acima daquele no qual a proteção do estado vítreo pode ser efetivo (Buitink, 2000).…”

Section: Introductionunclassified

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Açúcares e tolerância à alta temperatura de secagem em sementes de milho

José

Pinho²,

Dias³

2006

Rev. bras. sementes

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RESUMO -Dentre outros mecanismos, a presença de determinados açúcares solúveis na semente parece estar envolvida na aquisição e manutenção da tolerância à dessecação. Nesse trabalho foi pesquisado a composição de açúcares solúveis em sementes de milho híbrido com diferentes níveis de tolerância à alta temperatura de secagem, assim como a relação entre o conteúdo desses açúcares e a tolerância à dessecação. Foram utilizadas sementes de dez cultivares de milho híbrido que apresentavam efeito recíproco para a tolerância à alta temperatura de secagem. As sementes foram colhidas com teor de água de aproximadamente 35% e secadas a 45°C. A qualidade fisiológica das sementes foi avaliada por meio do teste de germinação, teste frio sem solo e de envelhecimento acelerado. Os açúcares glicose, frutose, sacarose, rafinose e estaquiose foram extraídos dos embriões na presença de metanol e separados por meio da técnica de Cromatografia Líquida de Alta Eficiência (HPLC). Foi observada variação na composição dos açúcares entre as sementes dos híbridos e as de seus recíprocos. Uma maior concentração de sacarose foi verificada nas sementes dos híbridos tolerantes à alta temperatura de secagem. Não foi possível estabelecer uma relação entre a sacarose e rafinose que pudesse servir de parâmetro para a tolerância à alta temperatura de secagem em sementes de milho. Maior tolerância das sementes foi associada com uma maior relação da sacarose, rafinose e estaquiose/glicose e frutose.Termos para indexação: Zea mays, tolerância à dessecação, açúcares solúveis, qualidade fisiológica SUGARS AND TOLERANCE TO HIGH DRYING TEMPERATURE IN CORN SEEDSABSTRACT -Among other mechanisms, the presence of certain soluble sugars in seed seems to be involved in the acquisition and maintenance of desiccation tolerance. In this study, the composition of. soluble sugars in hybrid corn seeds with different levels of tolerance to high drying temperature as well as the relationship between the content of those sugars and desiccation tolerance was researched. Seeds of ten hybrid corn cultivars presenting reciprocal effect to the tolerance to high drying temperature were employed. The seeds were harvested with a water content of about 35% and dried at 45°C. The physiological quality of the seeds was evaluated by means of the germination test, cold test without soil and accelerated aging test. The sugars glucose, fructose, sucrose, raffinose and stachiose were extracted from the embryos in the presence of methanol and separated by means of the High Performance Liquid Chromatography (HPLC) technique. Variation in the presence of sugars among the hybrid seeds and those of their reciprocals was detected. A higher concentration of sucrose was verified in hybrid seeds tolerant to high drying temperature. It was not possible to establish a ratio between sucrose and raffinose which could serve as a parameter of the tolerance to high drying temperature in corn seeds. Increased tolerance of the seeds was associated with a greater ratio of sucrose, raffinose and stachiose...

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Biological glasses: nature's way to preserve life

Cited by 8 publications

References 158 publications

What Do We Know About the Genetic Basis of Seed Desiccation Tolerance and Longevity?

What Do We Know About the Genetic Basis of Seed Desiccation Tolerance and Longevity?

Poikilohydry and homoihydry: antithesis or spectrum of possibilities?

Açúcares e tolerância à alta temperatura de secagem em sementes de milho

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