Secondary dormancy of seeds in relation to the Bromus tectorum-Pyrenophora semeniperda pathosystem

Hawkins, K.; Allen, Phil S.; Meyer, Susan E.

doi:10.17221/30/2013-pps

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…It may help H. dubia survive in environments with seasonal drought. The ability of seeds to enter secondary dormancy affects the transmissibility of the seed bank over years (Hawkins 2014). The predisposition of seeds to secondary dormancy varies among genotypes for oilseed rape (Weber et al 2010).…”

Section: Resultsmentioning

confidence: 99%

Germination and Secondary Dormancy Of Hydrocharis Dubia (Blume) Seed

Xue

Sun

et al. 2023

Bangladesh J. Bot.

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The germination of freshly harvested, dry-stored and wet-stored Hydrocharis dubia seeds were treated with exogenous GA3, cold stratification, puncture, different temperatures and combined treatments under controlled laboratory conditions. The results showed that: The optimal temperature for H. dubia seed germination is 23℃ and fresh seed has conditional dormancy, which can be released by puncture. Seed germination percentage decreased significantly after dry seed storage and the main reason for the reduction of "seed germination ability" by dry storage was that dry storage. caused secondary dormancy but a reduction of seed vigor. The secondary dormancy is non- deep physiological dormancy, which can be released by cold stratification, seed puncture and combination treatments. The findings provided further insight into how germination strategy contributes to the seed bank formation and species reproduction. Bangladesh J. Bot. 52(2): 429-435, 2023 (June)

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Section: Resultsmentioning

confidence: 99%

Germination and Secondary Dormancy Of Hydrocharis Dubia (Blume) Seed

Xue

Sun

et al. 2023

Bangladesh J. Bot.

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“…With autumn infection, seeds escape death through rapid germination or are killed if radicle emergence is delayed by intermittent hydration. In late autumn through early spring, seeds may become secondarily dormant (Finch et al 2013;Hawkins et al 2013). These seeds are also highly vulnerable to the fungus.…”

Section: Resultsmentioning

confidence: 99%

Exposure to low water potentials and seed dormancy favour the fungus in the Pyrenophora semeniperda-Bromus tectorum pathosystem

Finch-Boekweg¹,

Allen²,

Meyer³

2013

Plant Prot. Sci.

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Finch H., Allen P., Meyer S. (2013): Exposure to low water potentials and seed dormancy favour the fungus in the Pyrenophora semeniperda-Bromus tectorum pathosystem. Plant Protect. Sci., 49 (Special Issue): S15-S20.In semi-arid regions of the United States, Pyrenophora semeniperda kills seeds of the winter annual Bromus tectorum. We report on pathosystem outcomes under manipulated water potential and temperature environments commonly observed within semi-arid environments for dormant and non-dormant seeds. We propose a range of outcomes for infected seeds. During summer, seeds remain dormant and are killed across a range of water potentials. During autumn, seeds survive by rapidly germinating or are killed if radicle emergence is delayed by intermittent hydration. In winter/spring, secondarily dormant seeds can be killed by the fungus. The only likely scenarios where seeds escape death include absence of infection (autumn, spring, or following autumn, germination) or infection in autumn when seeds germinate rapidly.

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“…However, a fraction of the seed population is induced into dormancy by winter conditions (i.e. secondary dormancy, Hawkins et al 2013). These dormant seeds have the potential to carry over across years as components of the soil seed bank.…”

Section: Methodsmentioning

confidence: 99%

Predictive model for soil seedbank outcomes in the Pyrenophora semeniperda-Bromus tectorum pathosystem

Allen¹,

Meyer²,

Beckstead³

2013

Plant Prot. Sci.

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Allen P.S., Meyer S.E., Beckstead J. (2013): A predictive model for soil seed bank outcomes in the Pyrenophora semeniperda-Bromus tectorum pathosystem. Plant Protect. Sci., 49 (Special Issue): S21-S24.Pyrenophora semeniperda is abundant in soil seed banks of Bromus tectorum, where it kills a fraction of seeds throughout the year. The pathogen engages in a race with host seeds for endosperm resources; the pathogen success is negatively correlated with seed germination speed. We developed a deterministic model to predict pathosystem outcomes (seed death versus seed escape), using seed bank data from 80 sites collected over a 13-year period. The response variable (killed seeds in the spring seed bank) was regressed on multiple predictor variables (pathogen and host densities at seed dispersal, amount and timing of precipitation). Increased mortality was associated with high seed rain, high pathogen density, and low autumn precipitation. On xeric sites, a positive feedback loop between pathogen and host is created by a large carryover seed bank containing secondarily dormant seeds vulnerable to fungal attack and results in higher inoculum loads at seed dispersal the following year.

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Secondary dormancy of seeds in relation to the Bromus tectorum-Pyrenophora semeniperda pathosystem

Cited by 7 publications

References 9 publications

Germination and Secondary Dormancy Of Hydrocharis Dubia (Blume) Seed

Germination and Secondary Dormancy Of Hydrocharis Dubia (Blume) Seed

Exposure to low water potentials and seed dormancy favour the fungus in the Pyrenophora semeniperda-Bromus tectorum pathosystem

Predictive model for soil seedbank outcomes in the Pyrenophora semeniperda-Bromus tectorum pathosystem

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