The Response of Spore Germination of Sphagnum Mosses to Single and Combined Fire-Related Cues

Yusup, Shuayib; Sundberg, Sebastian; Fan, Beibei; Sulayman, Mamtimin; Bu, Zhao‐Jun

doi:10.3390/plants11040485

Cited by 3 publications

(1 citation statement)

References 55 publications

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“…After the treatments, spore viability was assessed with methylene blue dye (Bai et al ., 2022; Yusup et al ., 2022), together with a germination test for 21 days. The culture medium for testing germination was 0.125 g agar and 8 ml Rudolph nutrient solution in a 6‐cm diameter Petri dish.…”

Section: Methodsmentioning

confidence: 99%

Dry/wet cycling reduces spore germination and viability in six peatland bryophytes

et al. 2023

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Dry/wet cycling driven by water level fluctuation in wetlands may strongly influence the destiny of seeds. However, how dry/wet cycling affects spore survival and germinability in peatland bryophytes is poorly understood.• Six peatland bryophytes, three hummock-and three hollow-dwelling Sphagnum species, were chosen as study species. We tested the effects of dry (60% air RH)/wet (waterlogging) cycle frequency (once per 12, 8 or 4 days for low, medium or high, respectively) and ratio (3:1, 1:1 or 1:3 dry:wet time per cycle) on spore germinability, viability, dormancy percentage and protonema development.• Dry/wet cycling significantly reduced spore germination percentage and viability and slowed protonema development in all Sphagnum species, being more pronounced with higher dry/wet cycling frequencies. The hummock species S. capillifolium and S. fuscum had higher spore germination percentage after the continuous dry treatment, while the hollow species S. angustifolium, S. squarrosum and S. subsecundum showed the opposite response, compared to the continuously wet treatment. Except for S. squarrosum, spore viability was higher after the dry than after the wet treatment. Spore viability and dormancy percentage were higher after a dry/wet ratio of 1:3 than after ratios of 3:1 and 1:1.• Our study shows that both germinability and viability of bryophyte spores are reduced by dry/wet cycling (especially when frequent) in peatlands. This emphasizes the need to ensure constant water levels and low frequencies of water level fluctuation, which are relevant in connection with wetland restoration, to promote Sphagnum spore survival and establishment in peatlands after disturbances.

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Section: Methodsmentioning

confidence: 99%

Dry/wet cycling reduces spore germination and viability in six peatland bryophytes

et al. 2023

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Sphagnoid spores as tracers of environmental and climatic changes in peatland habitats of the early Eocene

Riegel,

Lenz,

Wilde

2024

Int J Earth Sci (Geol Rundsch)

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Peat mosses have been an important part of the lignite forming vegetation in the early Eocene of the Helmstedt Lignite Mining District. Three genera of Sphagnum-type spores can be distinguished: Tripunctisporis, Distancoraesporis and Sphagnumsporites. The distribution of these sphagnoid spores is traced through seven lignite seams including most of the known hyperthermal events from the PETM to the EECO. In general, Sphagnum-type spores increase in importance from base to top in each seam as a result of acidification and nutrient depletion during peat accumulation. The proportion of Tripunctisporis increases from Main Seam to Seam 6. The lower three seams are characterized by assemblages typical for coastal plain swamp forests including tree stumps and charcoal in distinct layers and lenses. The upper seams, in which Tripunctisporis is dominant and woody material is rare, are thin-bedded with charcoal in numerous thin drapes on bedding planes. The palynomorph assemblages here indicate a low growing mainly herbaceous vegetation typical of ombrogenous bogs. The change from topogenous swamp forests to open ombrogenous bogs takes place along with the hyperthermals of the early Eocene from the PETM to the EECO. The change from a swamp forest to a shrub forest in the middle of the Main Seam coincides with the isotope excursion of the PETM. Similar changes in other seams independent of thermal events indicate that thermal events merely amplify changes in vegetation, which are primarily imposed by edaphic constraints. It is rather the rapid accumulation of hyperthermals during the EECO that exerts sufficient environmental stress to fundamentally alter the peat forming vegetation. Graphical abstract

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Smoke promotes germination of peatland bryophyte spores

Yusup

Sundberg

Ooi

et al. 2022

Journal of Experimental Botany

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Northern peatlands are globally important carbon stores, but with increasing fire frequency, the re-establishment of bryophytes (notably Sphagnum) becomes crucial for their carbon sequestration. Smoke-responsive germination is a common trait in seeds in fire-prone ecosystems but has not been demonstrated in bryophyte spores. To investigate the potential role of smoke in post-fire peatland recovery, we tested the germination of spores of fifteen bryophyte species after treatment with smoke-water. Comparison of smoke responsiveness between spores of different laboratory storage times and burial depths/age (3-200 yrs old) were subsequently tested. Smoke increased germination percentage for 10 of the 15 study species, and increased germination speed for four of these. Smoke responsiveness increased along the fire frequency gradient from open expanse to forest margin, consistent with the theory that this selects for the maintenance of fire-adapted traits. Smoke enhanced germinability of 1-yr but not 4-yr laboratory-stored spores. Smoke, however, considerably increased germinability of spores naturally buried in peat for decades and up to c. 200 yrs. The effect of fire may be overlooked in non-fire-prone ecosystems, e.g. those in which wetland bryophytes dominate. Hence, an expected increase in fire frequency may lead to shifts in species dominance, for which our study provides one mechanism, which may affect long-term carbon sequestration in peatlands

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The Response of Spore Germination of Sphagnum Mosses to Single and Combined Fire-Related Cues

Cited by 3 publications

References 55 publications

Dry/wet cycling reduces spore germination and viability in six peatland bryophytes

Dry/wet cycling reduces spore germination and viability in six peatland bryophytes

Sphagnoid spores as tracers of environmental and climatic changes in peatland habitats of the early Eocene

Smoke promotes germination of peatland bryophyte spores

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