A role for pectin-associated arabinans in maintaining the flexibility of the plant cell wall during water deficit stress

Moore, John P.; Farrant, Jill M.; Driouich, Azeddine

doi:10.4161/psb.3.2.4959

Cited by 116 publications

(81 citation statements)

References 24 publications

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“…Biochemical changes in the plant cell wall polysaccharides and proteins take place, making the cell wall more flexible [71], thus enabling the morphological rolling and reversible folding of the leaves (Fig. 1) [72,73]. These changes could be more specific for particular species and could involve incorporation of specific proteins in the cell wall as observed for the glycine-rich protein BhGRP1 in Boea hygrometrica [74], substitution of glucose residues with galactose residues in xyloglucan as observed in Craterostigma wilmsii [75], activation of expansins resulting in a more extendable cell wall in C. plantagineum [71], or arabinose-rich pectin polymers in Myrothamnus flabellifolia [72].…”

Section: Sugar Metabolism and Desiccation Tolerancementioning

confidence: 99%

Molecular mechanisms of desiccation tolerance in the resurrection glacial relic Haberlea rhodopensis

Gechev¹,

Benina²,

Obata

et al. 2012

Cell. Mol. Life Sci.

166

261

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Section: Sugar Metabolism and Desiccation Tolerancementioning

confidence: 99%

Molecular mechanisms of desiccation tolerance in the resurrection glacial relic Haberlea rhodopensis

Gechev¹,

Benina²,

Obata

et al. 2012

Cell. Mol. Life Sci.

166

261

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“…Orthodox seeds present a high proportion of galactans and polysaccharides with arabinose, which acts as a plasticizer, increasing the cell wall flexibility and decreasing strong interactions between polysaccharides (Jones and McQueen-Mason, 2004;Moore et al, 2008). In some orthodox sees, the arabinose proportion is extremely high, ranging from 38% to 60% of the cellular walls (Shiga and Lajolo, 2006).…”

Section: Ultrastructure Characteristicsmentioning

confidence: 99%

“…Drying process cause fewer injuries at the beginning of germination than at the end of germination ( Figure 5B-D). In resurrection plants, for example, the cellular wall bending and the cells contraction allow the reversibility of withering and curling of the leaves (Moore et al, 2006;Moore et al, 2008). In orthodox seeds, the correct bending of the association between the plasmatic membrane and cellular wall at the end of the seed maturing process is essential to prevent mechanic damages to tissues (Vicré et al, 2004).…”

Section: Ultrastructure Characteristicsmentioning

confidence: 99%

Physiological, cellular and molecular aspects of the desiccation tolerance in Anadenanthera colubrina seeds during germination

2017

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During germination, orthodox seeds become gradually intolerant to desiccation, and for this reason, they are a good model for recalcitrance studies. In the present work, physiological, biochemical, and ultrastructural aspects of the desiccation tolerance were characterized during the germination process of Anadenanthera colubrina seeds. The seeds were imbibed during zero (control), 2, 8, 12 (no germinated seeds), and 18 hours (germinated seeds with 1 mm protruded radicle); then they were dried for 72 hours, rehydrated and evaluated for survivorship. Along the imbibition, cytometric and ultrastructural analysis were performed, besides the extraction of the heat-stable proteins. Posteriorly to imbibition and drying, the evaluation of ultrastructural damages was performed. Desiccation tolerance was fully lost after root protrusion. There was no increase in 4C DNA content after the loss of desiccation tolerance. Ultrastructural characteristics of cells from 1mm roots resembled those found in the recalcitrant seeds, in both hydrated and dehydrated states. The loss of desiccation tolerance coincided with the reduction of heat-stable proteins.Keywords: desiccation tolerance, forest seeds, drying.Aspectos fisiológicos, celulares e moleculares da tolerância à dessecação em sementes de Anadenanthera colubrina durante a germinação ResumoDurante a germinação, sementes ortodoxas tornam-se gradualmente intolerantes à dessecação, e por isso podem ser utilizadas como modelo para o estudo da recalcitrância. No presente trabalho realizou-se uma caracterização dos aspectos fisiológicos, bioquímicos e ultraestruturais da perda da tolerância à dessecação de sementes de Anadenanthera colubrina em processo germinativo. Para isso as sementes foram embebidas durante 0 (controle), 2,8,12 e aproximadamente 18 horas (sementes germinadas com 1 mm de radícula), secas por 72 horas, reidratadas e a sobrevivência avaliada. Ao longo da embebição foram realizadas análises citométricas, ultraestruturais e extração de proteínas resistentes ao calor e após embebição e secagem foram avaliados danos ultraestruturais. A tolerância à dessecação foi totalmente perdida após a protrusão radicular. Não houve aumento do conteúdo de DNA 4C quando a tolerância à dessecação foi perdida. Características ultraestruturais de células de radículas de 1 mm assemelharam-se às encontradas em sementes recalcitrantes tanto no estado hidratado quanto desidratado. A perda da tolerância à dessecação coincidiu com a redução do conteúdo de proteínas resistentes ao calor.Palavras-chave: tolerância à dessecação, sementes floretais, secagem.

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“…Studies with resurrection plants have demonstrated that CW flexibility can be modified by a constitutively high content of pectin-associated arabinans (Moore et al 2006(Moore et al , 2008a. Water is the most abundant component of the CW (approximately 75-80 % water) and decides on its pectic hydro-gel properties and thus viscoelastic nature (Cosgrove 1997).…”

Section: Cell-wall Porositymentioning

confidence: 99%

Interaction of aluminium and drought stress on root growth and crop yield on acid soils

2013

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Background Aluminium (Al) toxicity and drought stress are two major constraints for crop production in the world, particularly in the tropics. The variation in rainfall distribution and longer dry spells in much of the tropics during the main growing period of crops are becoming increasingly important yield-limiting factors with the global climate change. As a result, crop genotypes that are tolerant of both drought and Al toxicity need to be developed. Scope The present review mainly focuses on the interaction of Al and drought on root development, crop growth and yield on acid soils. It summarizes evidence from our own studies and other published/related work, and provides novel insights into the breeding for the adaptation to these combined abiotic stresses. The primary symptom of Al phytotoxicity is the inhibition of root growth. The impeded root system will restrict the roots for exploring the acid subsoil to absorb water and nutrients which is particularly important under condition of low soil moisture in the surface soil under drought. Whereas drought primarily affects shoot growth, effects of phytotoxic Al on shoot growth are mostly secondary effects that are induced by Al affecting root growth and function, while under drought stress root growth may even be promoted. Much progress has recently been made in the understanding of the physiology and molecular biology of the interaction between Al toxicity and drought stress in common bean (Phaseolus vulgaris L.) in hydroponics and in an Al-toxic soil. Conclusions Crops growing on acid soils yield less than their potential because of the poorly developed root system that limits nutrient and water uptake. Breeding for drought resistance must be combined with Al resistance, to assure that drought resistance is expressed adequately in crops grown on soils with acid Al-toxic subsoils.

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A role for pectin-associated arabinans in maintaining the flexibility of the plant cell wall during water deficit stress

Abstract: Abbreviations: RGI, rhamnogalacturonan I; RGII, rhamnogalacturonan II; HG, homogalacturonan

Cited by 116 publications

References 24 publications

Molecular mechanisms of desiccation tolerance in the resurrection glacial relic Haberlea rhodopensis

Molecular mechanisms of desiccation tolerance in the resurrection glacial relic Haberlea rhodopensis

Physiological, cellular and molecular aspects of the desiccation tolerance in Anadenanthera colubrina seeds during germination

Interaction of aluminium and drought stress on root growth and crop yield on acid soils

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