Hardening enhances photoprotection in the moss<i>Atrichum androgynum</i>during rehydration by increasing fast- rather than slow-relaxing quenching

Beckett, Richard P.; Marschall, Mariann; Laufer, Zsanett

doi:10.1179/174328205x40536

Cited by 30 publications

(19 citation statements)

References 31 publications

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“…; Beckett et al . , ; Cruz de Carvalho et al . ; Marschall & Borbély ), the mechanism of inducible DT in Sphagnum species and its impact on peatland ecology have not been considered so far.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

Desiccation tolerance of Sphagnum revisited: a puzzle resolved

Hájek

Vicherová

2013

Plant Biol J

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“…For bryophytes, plenty of studies has demonstrated that experienced desiccation can make them adapt to desiccation stress better (Beckett, 1999;Beckett, Marschall, & Laufer, 2005;Bopp & Werner, 1993;Dilks & Proctor, 1976;Schonbeck & Bewley, 1981a, 1981bWerner, Ros Espín, Bopp, & Atzorn, 1991); however, this stress imprinting tends to wear off with the extension of the recovery time, and slower desiccation rates produce longer imprinting times (Brinda, Stark, Clark, & Greenwood, 2016). For naturally growing mosses in the field, water between dense individuals generally leads to relatively slow desiccation rates and the intervals between dry events varied.…”

Section: Introductionmentioning

confidence: 99%

Evidence of stress imprinting with population‐level differences in two moss species

Liu

et al. 2019

Ecology and Evolution

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Plants are often repeatedly exposed to stresses during their lives and have a mechanism called stress imprinting that provides “memories” of stresses they experience and increases their ability to cope with later stresses. To test hypotheses that primed bryophytes can preserve their stress imprinting after 6 days of recovery and induce higher levels of osmolytes and ROS‐scavenging activities upon later stress exposure, and there exist population‐level differentiation in their desiccation defenses, we transplanted samples of two populations of each of two moss species, Hypnum plumaeforme and Pogonatum cirratum, in a nature reserve in southern China. After 16 months of acclimation, sets of each population were subjected to control, one‐time desiccation stress, duplicated desiccation stress and cross‐stress (low temperature stress followed by desiccation stress) treatments. Levels of oxidant enzymes, osmolytes, and phytohormones in the samples were then determined. The desiccation stress generally led to increases in activities or contents of superoxide dismutase, guaiacol peroxidase, catalase, proline, soluble sugars, soluble proteins, and stress hormones including abscisic acid (ABA), jasmonates (JA), and salicylic acid (SA), with differences between both species and populations. After a 6‐day recovery period, contents of phytohormones (including ABA, JA, SA, and cytokinins) in stressed H. plumaeforme had substantially fallen toward control levels. The duplicated and cross‐stress treatments generally led to further accumulation of proline, soluble sugars, and soluble proteins, with further increases in activities of antioxidant enzymes in some cases. Furthermore, significant differences between allochthonous and native populations were found in contents of malondialdehyde and osmolytes, as well as antioxidant enzyme activities. Our results confirm the hypotheses and highlight the importance of osmolytes in mosses' stress responses.

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“…Maximum fluorescence (Fm) of dark-adapted leaf was obtained after a brief saturating flash (approximately 8 s). Further details of the fluorescence parameters measured were as outlined previously (Genty et al 1989;Beckett et al 2005). In the current study, four actinic lights: 264, 488, 800 and 1,200 lmol PAR m -2 s -1 were switched on at a regular interval (5 min).…”

Section: Photosynthetic Pigment Content and Chlorophyll Fluorescence mentioning

confidence: 99%

“…The phytochemical quenching parameters evaluated were maximum quantum yield of PSII (Fv/Fm), actual quantum yield of PSII (/ PSII ) and photochemical quenching (qP). In addition, non-photochemical quenching (NPQ) and relative electron transport rate (ETR) at the four light intensities were calculated as outlined by Beckett et al (2005). According to Zribi et al (2009), these aforementioned parameters are indicator of photosynthetic disturbance in tomato under salt stress.…”

Section: Photosynthetic Pigment Content and Chlorophyll Fluorescence mentioning

confidence: 99%

A novel inhibitor of cytokinin degradation (INCYDE) influences the biochemical parameters and photosynthetic apparatus in NaCl-stressed tomato plants

Aremu

Sunmonu

Kulkarni

et al. 2014

Planta

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The effect of 2-chloro-6-(3-methoxyphenyl)aminopurine [inhibitor of cytokinin degradation (INCYDE)] at 10 nM on growth, biochemical and photosynthetic efficiency in sodium chloride (NaCl)-stressed (75, 100 and 150 mM) tomato plants was investigated. NaCl-induced decline in plant vigor index was slightly reversed by both drenching and foliar application of INCYDE. Foliar application of INCYDE significantly increased the flower number in the control and 75 mM NaCl-supplemented plants, while drenching was more effective in 150 mM NaCl-stressed plants. Antioxidant enzymes (peroxidase, catalase and superoxide dismutase) were enhanced in the presence of INCYDE in the control and NaCl-stressed plants. Higher concentration of malondialdehyde (MDA) associated with oxidative (lipid peroxidation) damage in leaf tissue which was evident in the presence of NaCl stress was significantly attenuated with the drenching and foliar application of INCYDE. Regardless of NaCl concentration, application of INCYDE had no significant influence on maximum quantum efficiency of photosystem II. However, the reduced quantum yield of photosystem II and coefficient of photochemical quenching under continuous illumination with actinic light at four intensities (264, 488, 800 and 1,200 µmol m(-2) s(-1)) in NaCl-stressed (100 and 150 mM) tomato plants were significantly alleviated by drenching application with INCYDE. Non-photochemical quenching of the singlet excited state of chlorophyll a and relative electron transfer rate were generally higher in INCYDE-treated plants than in the controls. From an agricultural perspective, these findings indicate the potential of INCYDE in protecting plants against NaCl stress and the possibility of enhanced productivity.

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Hardening enhances photoprotection in the mossAtrichum androgynumduring rehydration by increasing fast- rather than slow-relaxing quenching

Cited by 30 publications

References 31 publications

Desiccation tolerance of Sphagnum revisited: a puzzle resolved

Desiccation tolerance of Sphagnum revisited: a puzzle resolved

Evidence of stress imprinting with population‐level differences in two moss species

A novel inhibitor of cytokinin degradation (INCYDE) influences the biochemical parameters and photosynthetic apparatus in NaCl-stressed tomato plants

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