Effect of temperature and moist conditions on seed dormancy cycling of two sympatric limestone species, <i>Begonia guishanensis</i> and <i>Paraisometrum mileense,</i> in southern China

Hu, Xiaojian; Cheng, Long; Li, Airong; Yang, Xiangyun; Baskin, Carol C.

doi:10.1017/s0960258520000069

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…seeds from humid and semi‐humid areas of grassland, forest edge and meadow and found that seed GP decreased under dry/wet cycles. Seed germination of Begonia guishanensis in Karst mixed forest was reduced by dry/wet cycling compared to a dry treatment (Hu et al ., 2020). These researchers suggested that this was a dormancy adaptation of seeds to adverse germination conditions (Downs & Cavers, 2000; Hu et al ., 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Seed germination of Begonia guishanensis in Karst mixed forest was reduced by dry/wet cycling compared to a dry treatment (Hu et al ., 2020). These researchers suggested that this was a dormancy adaptation of seeds to adverse germination conditions (Downs & Cavers, 2000; Hu et al ., 2020). In addition, dry/wet cycling may damage organelles and the osmotic function of cell membranes, further leading to leakage of solutes and low molecular weight metabolites in cells (Bewley, 1997).…”

Section: Discussionmentioning

confidence: 99%

“…For example, in tropical regions of Australia, dry/wet cycling significantly promoted seed germination of four herbaceous species compared with a single dry or wet treatment, and the germination percentage of species that experienced four dry/wet cycles was 36% higher than that after one cycle (Hoyle et al ., 2008). However, other studies have shown that dry/wet cycling has no significant effect on seed germination (Dalziell et al ., 2018), and can even reduce seed germination percentage (GP) (Hu et al ., 2020) probably by disrupting metabolic processes within seeds (Bekker et al ., 1998). The effect of soil moisture on seed bank persistence depends on sensitivity of the species to environmental factors and seed adaptability to specific habitats (Abedi et al ., 2014; Carta et al ., 2018; Barton et al ., 2020).…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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‘Dust seeds’ with undifferentiated embryos and their germination in mycoheterotrophic Monotropoideae (Ericaceae)

Baskin

2020

Seed Sci. Res.

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‘Dust seeds’ with an undifferentiated (organless) embryo are known to be produced by mycoheterotrophic species (MH) in nine families of angiosperms. However, aside from the numerous studies on seed germination of orchids, relatively little is known about germination in MH families. In the Ericaceae, some degree of mycoheterotrophy (full, partial or initial) and dust seeds with an undifferentiated embryo occur in all species in the three tribes of Monotropoideae, the only subfamily of Ericaceae with this combination of characters. In most species, the seed is <0.90 mm in the greatest dimension, the endosperm is absent (Pityopus) or consists of few to many (30–40) cells, and the embryo is minute, consisting of as few as two cells in Monotropa. Germination in Monotropoideae is monopolar, with only the radicular pole of the embryo participating in germination. Thus, germination polarity differs from that of the dust seeds of orchids in which only the plumular pole of the embryo (protocorm) participates in germination. The dust seeds in Monotropoideae require the presence of fungi, either direct contact with a fungus or the presence of a diffusible substance therefrom, to germinate (symbiotic germination). Recently, representatives of the four genera of tribe Pyroleae have been successfully germinated asymbiotically in vitro. We present a broad overview of dust-size seeds in angiosperms and conclude that they should be subdivided into at least two major categories.

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Germination of Seeds Subjected to Temperature and Water Availability: Implications for Ecological Restoration

Luo

Cheng

Yan

et al. 2022

Forests

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The regeneration of natural Betula platyphylla Suk., a pioneer tree and predominant species in stand forest of the northern region, China faces a challenge, i.e., population decline. One of the bottlenecks relative to the successful seedling establishment is the effectiveness of seed germination. In this study, four different families (3-4, 3-22, 3-42, and 3-43) of B.platyphylla seeds were used as research objects to explore the effects of temperature and PEG simulated drought on seed germination. The result showed that seed germination ability from different families increased first and then decreased with the increase in temperature. The germination rate (GR), germination value coefficient (GVC), and germination index (GI) at 25 ℃ and 30 ℃ were significantly higher than those at lower temperatures (15 ℃ and 20 ℃) and higher temperature (35 ℃), and the time for germination percentage to reach 50% (T50) was faster. The germination ability decreased gradually with the increase in drought stress. Seeds are more sensitive to drought stress at low temperatures, their germination is severely inhibited, and the tolerance range of PEG concentration at 15 °C (0%–10%) is less than other temperatures (10%–20%), while they can germinate well at high temperatures and the tolerance to drought stress is stronger. Our results suggested that 3-43 had better germination ability at high temperature, while 3-22 had better germination ability at low temperature. Our findings highlight low temperatures and drought stress as key factors limiting seed germination, which may be one of the bottlenecks to population regeneration. This research provides a scientific reference for the natural regeneration and population restoration of B. platyphylla.

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Effect of temperature and moist conditions on seed dormancy cycling of two sympatric limestone species, Begonia guishanensis and Paraisometrum mileense, in southern China

Cited by 3 publications

References 25 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

‘Dust seeds’ with undifferentiated embryos and their germination in mycoheterotrophic Monotropoideae (Ericaceae)

Germination of Seeds Subjected to Temperature and Water Availability: Implications for Ecological Restoration

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