The desert moss <i>Pterygoneurum lamellatum</i> (Pottiaceae) exhibits an inducible ecological strategy of desiccation tolerance: Effects of rate of drying on shoot damage and regeneration

Stark, Lloyd R.; Greenwood, Joshua L.; Brinda, John C.; Oliver, Melvin J.

doi:10.3732/ajb.1200648

Cited by 44 publications

(42 citation statements)

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“…This demonstrates the importance of the bryophytes' life form traits, as patch size and structure, in establishing a slow dehydration rate that allows for the possibility of inductive processes of DT. A number of recent studies have indicated that the ecological strategy of DT in bryophytes is largely inducible, including both aquatic (Cruz de Carvalho et al, 2011 and desert mosses (Stark et al, 2013, thus challenging the idea that the bryophytes as a clade are largely constitutively protected from desiccation.…”

Section: Life Form As An Induction Agent Of Desiccation Tolerancementioning

confidence: 99%

“…Drying rate is crucial for DT induction in bryophytes (Stark et al, 2013;Greenwood and Stark, 2014), namely in the aquatic bryophyte Fontinalis antipyretica Hedw., where slow drying was previously shown to be essential (Cruz de Carvalho et al, 2011. The aim of the present work was to investigate how contrasting (fast and slow) dehydration rates change cell water relations in an aquatic bryophyte and how those changes explain the need for slow dehydration to induce DT.…”

Section: Introductionmentioning

confidence: 99%

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Influence of dehydration rate on cell sucrose and water relations parameters in an inducible desiccation tolerant aquatic bryophyte

Carvalho

Silva

Branquinho

et al. 2015

Environmental and Experimental Botany

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Section: Life Form As An Induction Agent Of Desiccation Tolerancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of dehydration rate on cell sucrose and water relations parameters in an inducible desiccation tolerant aquatic bryophyte

Carvalho

Silva

Branquinho

et al. 2015

Environmental and Experimental Botany

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“…Stark et al . ). By contrast, the desiccation‐avoiding sphagna invest in expensive structures to retain and conduct water, which enables them to maintain photosynthetic activity during drier periods.…”

Section: Introductionmentioning

confidence: 97%

Desiccation tolerance of Sphagnum revisited: a puzzle resolved

Hájek

Vicherová

2013

Plant Biol J

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As ecosystem engineers, Sphagnum mosses control their surroundings through water retention, acidification and peat accumulation. Because water retention avoids desiccation, sphagna are generally intolerant to drought; however, the literature on Sphagnum desiccation tolerance (DT) provides puzzling results, indicating the inducible nature of their DT. To test this, various Sphagnum species and other mesic bryophytes were hardened to drought by (i) slow drying; (ii) ABA application and (iii) chilling or frost. DT tolerance was assessed as recovery of chlorophyll fluorescence parameters after severe desiccation. We monitored the seasonal course of DT in bog bryophytes. Under laboratory conditions, following initial de-hardening, untreated Sphagnum shoots lacked DT; however, DT was induced by all hardening treatments except chilling, notably by slow drying, and in Sphagnum species of the section Cuspidata. In the field, sphagna in hollows and lawns developed DT several times during the growing season, responding to reduced precipitation and a lowered water table. Hummock and aquatic species developed DT only in late autumn, probably as a response to frost. Sphagnum protonemata failed to develop DT; hence, desiccation may limit Sphagnum establishment in drier habitats with suitable substrate chemistry. Desiccation avoiders among sphagna form compact hummocks or live submerged; thus, they do not develop DT in the field, lacking the initial desiccation experience, which is frequent in hollow and lawn habitats. We confirmed the morpho-physiological trade-off: in contrast to typical hollow sphagna, hummock species invest more resources in water retention (desiccation avoidance), while they have a lower ability to develop physiological DT.

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“…However, such extreme phenotypes are not applicable to many plant forms and may obscure nuanced components of the process. There has been a relative paucity of research on bryophytes that show lower levels of tolerance, although some recent studies address this Cruz de Carvalho et al, 2011Pardow and Lakatos, 2013;Bader et al, 2013;Stark et al, 2013), and numerous studies have investigated moderate levels of dehydration in the drought response of vascular plants (Hsiao, 1973;Osakabe et al, 2014). Bryophytes showing moderate DhT likely occupy a large ecological niche, and understanding their response to abiotic stress is important for predicting species range shifts due to environmental changes.…”

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confidence: 99%

Erratum: Sex differences and plasticity in dehydration tolerance: insight from a tropical liverwort

Burton¹,

McLetchie²

2016

Annals of Botany

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Background and Aims Adaptations allowing plants to cope with drying are particularly relevant in the light of predicted climate change. Dehydration tolerance (DhT, also dehydration-tolerant) is one such adaptation enabling tissue to survive substantial drying. A great deal of work has been conducted on highly DhT species. However, bryophytes showing less intense and variable DhT are understudied, despite the potential for these species to provide an informative link between highly tolerant and sensitive species. In this study, we tested the degree to which DhT varies across populations and the sexes of a species expected to exhibit a moderate DhT phenotype.Methods To test predicted patterns of tolerance we assessed DhT in males and females of Marchantia inflexa from two distinct habitat types that differ in water availability. Both common garden and field-collected tissue was subjected to drying assays at multiple intensities and recovery was monitored by chlorophyll florescence. Verification studies were conducted to confirm the level of dehydration, the rate of drying and the associated changes in photosynthetic physiology.Key Results We confirmed our expectation that M. inflexa is able to tolerate moderate dehydration. We also found that females exhibited higher DhT than males, but populations did not differ in DhT when cultured in a common garden. However, field-collected samples exhibited differences in DhT corresponding to environmental dryness, suggesting plasticity in DhT.Conclusions By studying a less extreme DhT phenotype we gained insight into how more sensitive (yet still tolerant) organisms cope with dehydration. Additionally, the identified sex-specific variation in DhT may explain ecological patterns such as female-biased sex ratios. Furthermore, plasticity in DhT has the potential to inform management practices aimed at increasing tolerance to drought conditions. Key words: Marchantia inflexa, sex difference, acclimation, chlorophyll fluorescence, desiccation tolerance, dehydration, plasticity. INTRODUCTIONIn a warming and increasingly variable climate, adaptations to cope with water scarcity are particularly relevant. Knowledge of such adaptive strategies can inform both natural and agricultural applications. For some plant species, unique adaptations provide a means for tissues to resurrect from near complete dehydration and apparent death. This capacity is known as desiccation tolerance, an extreme case of dehydration tolerance (DhT, also dehydration-tolerant). A variety of research has been conducted on the natural history (Alpert, 2000), physiology (Bewley, 1979), mechanisms (Le and McQueen-Mason, 2006;Gechev et al., 2012) and prevalence (Wood, 2007) of DhT with particular focus on highly desiccation-tolerant species.Dehydration tolerance is not common across the Tree of Life and most plant and animal tissue cannot withstand cellular water potentials below À10 MPa (Gaff, 1997;Walters et al., 2002). However, DhT tissues consistently recover from cellular water potentials below this level , an...

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The desert moss Pterygoneurum lamellatum (Pottiaceae) exhibits an inducible ecological strategy of desiccation tolerance: Effects of rate of drying on shoot damage and regeneration

Cited by 44 publications

References 90 publications

Influence of dehydration rate on cell sucrose and water relations parameters in an inducible desiccation tolerant aquatic bryophyte

Influence of dehydration rate on cell sucrose and water relations parameters in an inducible desiccation tolerant aquatic bryophyte

Desiccation tolerance of Sphagnum revisited: a puzzle resolved

Erratum: Sex differences and plasticity in dehydration tolerance: insight from a tropical liverwort

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