Carbon Balance Limits the Microdistribution of Grimmia laevigata, a Desiccation‐Tolerant Plant

Alpert, Peter; Oechel, Walter C.

doi:10.2307/1940527

Cited by 66 publications

(45 citation statements)

References 39 publications

(68 reference statements)

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“…Daily intercepted PPFD is a fundamental component of light acclimation (Pearcy 1998), and a strong determinant of the mechanisms used to dissipate excess light energy (Demming- Adams and Adams 1992;Osmond 1994;Adams et al 1999). Even though most HDT plants are active during periods of relatively low maximum PPFD (Proctor 1984;Alpert and Oechel 1985;Green and Lange 1994;Tuba et al 1998), it is possible that HDT "sun plants" could have photochemical attributes considered typical of shade-adapted vascular plants.…”

Section: Introductionmentioning

confidence: 99%

Ecophysiological consequences of contrasting microenvironments on the desiccation tolerant moss Tortula ruralis

et al. 2002

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Tortula ruralis is a homoiochlorophyllous-desiccation-tolerant (HDT) moss that retains all pigments when dehydrated and rapidly recovers physiological function upon rehydration. This moss forms extensive cover in exposed and shaded areas in the sandy semi-arid grasslands of Central Europe. We hypothesized that contrasting drying regimes between these microhabitats would affect plant N status, constraints to gas exchange and growth, as well as result in altered pigment concentrations and ratios, and photochemical light-response dynamics. Furthermore, we believed T. ruralis's HDT habit would limit its ability to acclimate to altered light environment. We found that sun plant T. ruralis had lower plant mass, as well as lower tissue N, C, total photosynthetic pigment concentrations and carbon isotope discrimination (Δ) values compared to shade plant counterparts. Carotenoid/chlorophyll ratios in sun plants were typical of high light-adapted tissue, but chlorophyll a/chlorophyll b ratios were lower, more characteristic of low light-adapted tissue. This unique combination of pigment responses was accompanied by sustained lower levels of optimal quantum efficiency of PSII (F /F) in sun plant T. ruralis, even during favorable diurnal conditions, and reduced engagement of energy-dependent thermal dissipation (NPQ). Reciprocal transplants of sun and shade plants showed that T. ruralis is capable of short-term adjustment to altered light level, as evidenced by increases in F /F, NPQ, and light-adapted PSII yield (φ) in transplanted sun plants, and concurrent decreases in sun-transplanted shade plants. However, the performance of transplanted sun plants remained consistently below that of undisturbed shade plants. These findings show that microenvironmental variation results in different patterns of resource acquisition in this HDT moss, and that growth in the open imparts greater desiccation tolerance, and the development of a greater standing engagement of slowly reversing photoprotective mechanisms. In contrast, prolonged activity and greater resource acquisition in shaded populations may allow T. ruralis to rapidly adjust to changes following disturbance to the plant canopy, fostering the persistence of T. ruralis in these semi-arid grasslands.

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Section: Introductionmentioning

confidence: 99%

Ecophysiological consequences of contrasting microenvironments on the desiccation tolerant moss Tortula ruralis

et al. 2002

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“…However, recovery of the carbon balance, cell cycle, and the cytoskeleton require more than 24 h (Alpert and Oechel, 1985;Mansour and Hallet, 1981;Pressel et al, 2006). Based on these results, it has been speculated that cell integrity is more difficult to recover than physiological reactions and that cell integrity greatly limits the recovery and regenerative capacity of desiccationtolerant mosses.…”

Section: Relationships Between Physiological Characteristics and The mentioning

confidence: 99%

Effects of storage temperature on the physiological characteristics and vegetative propagation of desiccation-tolerant mosses

Yue-wei

Zhao

2018

Biogeosciences

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Abstract. Mosses, as major components of later successional biological soil crusts (biocrusts), play many critical roles in arid and semiarid ecosystems. Recently, some species of desiccation-tolerant mosses have been artificially cultured with the aim of accelerating the recovery of biocrusts. Revealing the factors that influence the vegetative propagation of mosses, which is an important reproductive mode of mosses in dry habitats, will benefit the restoration of moss crusts. In this study, three air-dried desiccationtolerant mosses (Barbula unguiculata, Didymodon vinealis, and Didymodon tectorum) were hermetically sealed and stored at five temperature levels (0, 4, 17, 25, and 30 • C) for 40 days. Then, the vegetative propagation and physiological characteristics of the three mosses were investigated to determine the influence of storage temperature on the vegetative propagation of desiccation-tolerant mosses and the mechanism. The results showed that the vegetative propagation of the three mosses varied with temperature. The most variation in vegetative propagation among storage temperatures was observed in D. tectorum, followed by the variation observed in B. unguiculata. In contrast, no significant difference in propagation among temperatures was found in D. vinealis. The regenerative capacity of the three mosses increased with increasing temperature from 0 to 17 • C, accompanied by a decrease in malondialdehyde (MDA) content, and decreased thereafter. As the temperature increased, the chlorophyll and soluble protein contents increased in B. unguiculata but decreased in D. vinealis and D. tectorum. As to storage, the MDA and soluble sugar contents increased after storage. The MDA content of the three mosses increased at each of the investigated temperatures by more than 50 % from the initial values, and the soluble sugar content became higher than before in the three mosses. The integrity of cells and cell membranes is likely the most important factor influencing the vegetative propagation of desiccation-tolerant mosses. A 40-day storage period caused cell injury. Our results suggest that storage temperature can enhance or suppress such injury and change the regenerative capacity of the three mosses. The data indicate that the suitable storage temperature is 4 • C for B. unguiculata and 17 • C for both D. vinealis and D. tectorum.

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“…Sand burial not only directly reduces the photosynthetic area of mosses, but also causes a deterioration in the environmental conditions required for photosynthesis (e.g., reduction of photosynthetically active radiation and blocking gas exchange). Furthermore, the sand deposited on B. argenteum would intercept water from precipitation, decreasing the quantity of rainfall available to the moss, with the trivial amount of 360 precipitation received already identified as being detrimental (induce carbon starvation) to biocrust moss (Alpert and Oechel, 1985;Belnap et al, 2004). This would consolidate the negative effect of drought on the shoot elongation of B. argenteum.…”

Section: Possible Mechanisms Underlying the Combined Effects Of Drougmentioning

confidence: 99%

The mutually antagonistic effect of drought and sand burial enables the biocrust moss <i>Bryum argenteum</i> Hedw. to survive the two co-occurring stressors in an arid sandy desert

Jia

Zhao

Gao

et al. 2017

Preprint

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Abstract. Biocrust moss is an essential soil surface bio-cover. It represents the highest succession stage among the diverse range of surface-dwelling cryptogams (e.g., cyanobacteria, green algae, and lichen, which are also referred to as biological soil crusts) and makes a major contribution to soil stability and fertility throughout arid 10 desert ecosystems. The soil surface represents a small ecological niche that is poikilohydric in nature. Biocrust moss is therefore highly susceptible to drought and sand burial, which are two ubiquitous stressors in arid sandy deserts. However, little information is available regarding the mechanism by which biocrust moss can survive and flourish in these habitats when stressed simultaneously by the two stressors. The combined effects of drought and sand burial were evaluated in a field experiment using the predominant biocrust moss, Bryum 15 argenteum Hedw., in the Tengger Desert, China. Drought was simulated by applying distilled water in three artificial rainfall regimes at 8-day intervals in spring and autumn: 4 and 6 mm (average rainfall, control), 2 and 3 mm (double drought), and 1 and 1.5 mm (fourfold drought), respectively. The effect of sand burial was determined by applying six treatments, i.e., sand depths of 0 (control), 0.5, 1, 2, 4, and 10 mm. The four parameters of chlorophyll a content, PSII photochemical efficiency, regeneration potential, and shoot upgrowth 20 were evaluated in the moss. It was found that the combined effects of drought and sand burial did not exacerbate the single negative effects of the four parameters tested. Drought significantly ameliorated the negative effects of deep sand burial on the retention of chlorophyll a content, PSII photochemical efficiency, and regeneration potential of B. argenteum. Sand burial diminished and even reversed the negative effects of Biogeosciences Discuss., https://doi

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Carbon Balance Limits the Microdistribution of Grimmia laevigata, a Desiccation‐Tolerant Plant

Cited by 66 publications

References 39 publications

Ecophysiological consequences of contrasting microenvironments on the desiccation tolerant moss Tortula ruralis

Ecophysiological consequences of contrasting microenvironments on the desiccation tolerant moss Tortula ruralis

Effects of storage temperature on the physiological characteristics and vegetative propagation of desiccation-tolerant mosses

The mutually antagonistic effect of drought and sand burial enables the biocrust moss <i>Bryum argenteum</i> Hedw. to survive the two co-occurring stressors in an arid sandy desert

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Carbon Balance Limits the Microdistribution of Grimmia laevigata, a Desiccation‐Tolerant Plant

Cited by 66 publications

References 39 publications

Ecophysiological consequences of contrasting microenvironments on the desiccation tolerant moss Tortula ruralis

Ecophysiological consequences of contrasting microenvironments on the desiccation tolerant moss Tortula ruralis

Effects of storage temperature on the physiological characteristics and vegetative propagation of desiccation-tolerant mosses

The mutually antagonistic effect of drought and sand burial enables the biocrust moss &lt;i&gt;Bryum argenteum&lt;/i&gt; Hedw. to survive the two co-occurring stressors in an arid sandy desert

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The mutually antagonistic effect of drought and sand burial enables the biocrust moss <i>Bryum argenteum</i> Hedw. to survive the two co-occurring stressors in an arid sandy desert