Does the Removal of Non-Photosynthetic Sections Lead to a Down-Regulation of Photosynthesis in Mosses? A First Experiment

Wang, Zhe; Bader, Maaike Y.; Pi, Chunyan; He, Yan; Guo, Shuiliang; Bao, Weikai

doi:10.5252/cryptogamie-bryologie2021v42a7

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…For gas exchange measurements, anatomical analysis, pressure-volume curves, and desiccation assays, samples were cleaned, and brown tissues were removed. Green, healthy thalli/ shoots were incubated overnight in Petri dishes covered with wet tissues before measurements to avoid possible negative effects of the cutting (Wang et al, 2021). The studied specimen corresponded to some of those listed in Perera-Castro, Nadal, and Flexas (2020), for which net CO 2 assimilation rates were at 400 μmol CO 2 mol À1 air and some pressure-volume derived parameters were already reported.…”

Section: Plant Materials and Growing Conditionsmentioning

confidence: 99%

Desiccation tolerance in bryophytes relates to elasticity but is independent of cell wall thickness and photosynthesis

Perera-Castro

Flexas

2022

Physiologia Plantarum

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Mosses have been found outliers of the trade‐off between photosynthesis and bulk elastic modulus described for vascular plants. Hence, potential trade‐offs among physical features of cell walls and desiccation tolerance, water relations, and photosynthesis were assessed in bryophytes and other poikilohydric species. Long‐term desiccation tolerance was quantified after variable periods of desiccation/rehydration cycles. Water relations were analyzed by pressure–volume curves. Mesophyll conductance was estimated using both CO2 curve‐fitting and anatomical methods. Cell wall elasticity was the parameter that better correlated with the desiccation tolerance index for desiccation tolerant species and was antagonistic to higher absolute values of osmotic potential. Although high values of cell wall effective porosity were estimated compared with the values assumed for vascular plants, the desiccation tolerance index negatively correlated with the porosity in desiccation tolerant bryophytes. Neither cell wall thickness nor photosynthetic capacity were correlated with the desiccation tolerance index of the studied species. The existence of a potential evolutionary trade‐off between cell wall thickness and desiccation tolerance is rejected. The photosynthetic capacity reported for bryophytes is independent of elasticity and desiccation tolerance. Furthermore, the role of cell wall thickness in limiting CO2 conductance would be overestimated under a scenario of high cell wall porosity for most bryophytes.

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Section: Plant Materials and Growing Conditionsmentioning

confidence: 99%

Desiccation tolerance in bryophytes relates to elasticity but is independent of cell wall thickness and photosynthesis

Perera-Castro

Flexas

2022

Physiologia Plantarum

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When time is not of the essence: constraints to the carbon balance of bryophytes

Perera-Castro

González‐Rodríguez

Fernández

2022

Journal of Experimental Botany

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The data available so far indicate that photosynthetic and relative growth rates of bryophytes are a 10% of those reported for tracheophytes. By revising the existing literature and reanalysing data published in over a hundred of manuscripts, this review scrutinizes the ecophysiological, biochemical and structural reasons behind. The limiting rubisco content and surface for gas exchange are the internal factors that can explain more clearly the low rates of bryophytes. The role of their thicker cell walls in the limitation of CO2 diffusion depends on the current uncertainties regarding their porosity and permeability to CO2. From this review, it is also evident that, despite having low photosynthetic rates, the positive carbon balance of bryophytes is tightly related with their capacity to deal with extreme conditions. These include their capacity to deal with big daily oscillation between day and night temperatures, and to delay the cessation of photosynthesis under water deficit (or to tolerate desiccation in extreme situations). Although further studies on bryophytes are needed before more solid conclusions can be drawn, it seems that their success relies on a remarkable tolerance to a highly variable environment, possibly at the expense of their maximum photosynthetic rates.

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Does the Removal of Non-Photosynthetic Sections Lead to a Down-Regulation of Photosynthesis in Mosses? A First Experiment

Cited by 2 publications

References 41 publications

Desiccation tolerance in bryophytes relates to elasticity but is independent of cell wall thickness and photosynthesis

Desiccation tolerance in bryophytes relates to elasticity but is independent of cell wall thickness and photosynthesis

When time is not of the essence: constraints to the carbon balance of bryophytes

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