Dormancy breakage and germination are tightly controlled by hypoxic submergence water on <i>Echinochloa crus-galli</i> seeds from an accession resistant to anaerobic germination

Holguín, Juliana Echeverry; Crepy, María; Striker, Gustavo G.; Mollard, Federico P.O.

doi:10.1017/s0960258520000070

Cited by 4 publications

(1 citation statement)

References 45 publications

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“…Although flooding events can be an important means for seed dispersal to floodplain habitats, prolonged flooding can decrease seed viability, except for flood-tolerant hydrochorous species [ 91 ]. Some seeds may also break their dormancy while still submerged in flood water, resulting in risky underwater germination, and this can cause erratic germination and establishment in the floodplains [ 90 , 92 ]. Overall, alterations in duration, intensity, timing, and frequency of flooding or water level fluctuations can either disrupt or enhance the dispersal patterns of hydrochorous plant species.…”

Section: Discussionmentioning

confidence: 99%

How Does Changing Environment Influence Plant Seed Movements as Populations of Dispersal Vectors Decline?

Hernandez

Naeem

Zaman

2023

Plants

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Plants differ widely in their ability to find tolerable climatic ranges through seed dispersal, depending on their life-history traits and habitat characteristics. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, a systematic review on seed dispersal mechanisms was conducted to elucidate plant seed movements amid changing environments. Here, the highest relative count of studies was found in Spain (16.47%), followed by Brazil (14.12%), and the USA (14.12%). The megadiverse, hotspot countries (e.g., Philippines, Vietnam, Myanmar, India, and Indonesia) and Africa (Tanzania, South Africa, Democratic Republic of the Congo) have very low to no data about the reviewed topic. The effects of land use changes, habitat degradation/disturbances, climate, and extreme weather conditions on seed dispersal mechanisms and agents had the highest share of studies across topics and countries. Plant diversity and distribution of anemochorous, endozoochorous, epizoochorous, hydrochorous, myrmecochorous, and ornithochorous species are seriously affected by changing environments due to altered long-distance seed dispersal. The fruit types commonly associated with endozoochory and ornithochory are species with achene, capsule, drupe, fleshy, and nut fruits/seeds, whereas achene, capsule, samara/winged seeds are associated with anemochory. The present review provides a summary of evidence on how plants are affected by climate change as populations of dispersal vectors decline. Finally, recommendations for further study were made based on the identified knowledge gaps.

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Section: Discussionmentioning

confidence: 99%

How Does Changing Environment Influence Plant Seed Movements as Populations of Dispersal Vectors Decline?

Hernandez

Naeem

Zaman

2023

Plants

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Effect of flooding gradient on soil seedbank and standing vegetation in a disconnecting side channel of the Loire River (France)

Gaudichet

Greulich²,

Grellier³

et al. 2022

Hydrobiologia

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Seed germination of mudflat species responds differently to prior exposure to hypoxic (flooded) environments

2020

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Mudflats are exposed for short periods after flood water drawdown. They support fast-growing annual herbs with a ruderal strategy. To optimize their recruitment success, seeds of mudflat species germinate better under fluctuating temperatures, full illumination and aerobic environments that indicate the presence of optimal (non-flooded) conditions for plant growth and development. Here, we hypothesize that prior exposure of mudflat seeds to hypoxic (flooded) environment interferes with the germination process and results in more vigorous germination once aerobic conditions are regained. To test this hypothesis, seeds of five mudflat species were incubated in both aerobic and hypoxic environments at four (14/6, 22/14, 22/22 and 30/22°C) temperature regimes, reflecting different (seasonal) conditions when drawdowns may occur. All species responded positively to four temperature regimes; however, moderate 22/14 and 22/22°C temperatures were optimum for high percentages and rates (speed) of seed germination. Since seeds of four species germinated exclusively under aerobic conditions, they were moved from hypoxic to aerobic conditions. Prior exposure of seeds to hypoxic environment facilitated high percentages, rates and synchronization of germination of Limosella aquatica, Peplis portula and Samolus valerandi seeds compared to incubation under strict aerobic conditions. However, prior exposure to hypoxic environment induced secondary dormancy in non-dormant seeds of Hypericum humifusum but broke dormancy in Lythrum hyssopifolia seeds that otherwise required cold stratification to overcome physiological dormancy. All species that have a narrow ecological niche (strictly occurring in mudflat habitats) showed positive responses to prior exposure to hypoxic environments. In contrast, H. humifusum that has a wide ecological niche (from mudflats to moist sandy grasslands) showed a negative response. We conclude that the hypoxic environment may strongly affect seed germination behaviour once the aerobic environment is regained. The most striking effect is the acceleration of the germination process and, therefore, life cycle supporting the survival in an ephemeral habitat.

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Dormancy breakage and germination are tightly controlled by hypoxic submergence water on Echinochloa crus-galli seeds from an accession resistant to anaerobic germination

Cited by 4 publications

References 45 publications

How Does Changing Environment Influence Plant Seed Movements as Populations of Dispersal Vectors Decline?

How Does Changing Environment Influence Plant Seed Movements as Populations of Dispersal Vectors Decline?

Effect of flooding gradient on soil seedbank and standing vegetation in a disconnecting side channel of the Loire River (France)

Seed germination of mudflat species responds differently to prior exposure to hypoxic (flooded) environments

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