Factors influencing seedling emergence of three global invaders in greenhouses representing major eco‐regions of the world

Khan, Mohammed Abu Sayed Arfin; Vetter, Vanessa; Reshi, Zafar A.; Dar, Pervaiz Ahmad; Jentsch, Anke

doi:10.1111/plb.12710

Cited by 7 publications

(5 citation statements)

References 48 publications

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“…Overall, germination percentages in the climate chamber experiment (ca. 16%) were similar to the emergence rates found by Sõber and Ramula (2013) (21.5%), but relatively low compared to other studies on L. polyphyllus (Elliott et al 2011;Arfin-Khan et al 2018;over 60%). We suggest that this is at least partly due to the fact that seeds were not scarified and that dormancy was probably not broken by imbibition in the climate chamber experiment.…”

Section: Discussionsupporting

confidence: 87%

Germination of the invasive legume Lupinus polyphyllus depends on cutting date and seed morphology

Klinger¹,

Eckstein²,

Horlemann³

et al. 2020

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In semi-natural grasslands, mowing leads to the dispersal of species that have viable seeds at the right time. For invasive plant species in grasslands, dispersal by mowing should be avoided, and information on the effect of cutting date on the germination of invasive species is needed. We investigated the germination of seeds of the invasive legume Lupinus polyphyllus Lindl. depending on the cutting date. We measured seed traits associated with successful germination that can be assessed by managers for an improved timing of control measures. To this end, we sampled seeds of L. polyphyllus on six cutting dates and analyzed the germination of these seeds in climate chambers and under ambient weather conditions. We collected information on seed morphology (color/size/hardseededness) for each cutting date to identify seed traits associated with successful germination. Observed germination patterns were highly asynchronous and differed between seeds cut at different dates. Seeds cut early, being green and soft, tended to germinate in autumn. Seeds cut late, being dark and hard, were more prone to germinate the following spring, after winter stratification. This allows the species to utilize germination niches throughout the year, thus indicating a bet-hedging strategy. Seed color and the percentage of hard seeds were good predictors of germination percentage, but not of mean germination time and synchrony. Managers should prevent the species producing black and hard seeds, while cutting plants carrying green and soft seeds is less problematic. Furthermore, germination patterns differed between climate chambers and the common garden, mainly because germination of dormant seeds was lower in climate chambers. More germination experiments under ambient weather conditions should be carried out, as they can give information on the germination dynamics of invasive species.

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Section: Discussionsupporting

confidence: 87%

Germination of the invasive legume Lupinus polyphyllus depends on cutting date and seed morphology

Klinger¹,

Eckstein²,

Horlemann³

et al. 2020

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“…When specific factors affecting the seed viability and germination of seeds are reviewed, some factors tend to arise as more important than others. Temperature is seen as one of the most important factors affecting seed viability [34,57,58] and the ability to germinate [60], and water impermeability with hard-coated seeds is important for seed survival [31,55]. The effect of temperature has been based on for example microbial activity and cell ability to survive under temperature variations, and the lower limit of hygienization is set to 70 • C. Most difficulties with seed destruction are caused by seed dormancy.…”

Section: Risk Of Seed Survivalmentioning

confidence: 99%

Risk of Invasive Lupinus polyphyllus Seed Survival in Biomass Treatment Processes

et al. 2021

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Invasive plant species threaten native species and habitats causing ecologic, economic and social burden. When creating climate friendly solutions by utilizing plant biomasses in biogas and fertilizer production, safety should be ensured concerning the use of residues. This study concentrates on the treatment of biomasses containing invasive plant material by tunnel and windrow composting, and by farm-scale and laboratory-scale anaerobic digestion (AD) in mesophilic conditions. Germination of the nationally settled and harmful invasive species Lupinus polyphyllus Lindl. was investigated after these processes. In addition, the role of the conditions found in the processes that destroyed seeds were studied, such as the time of exposure, temperature and static pressure. Dormant seeds are well protected against harsh conditions and can survive through various stress factors, but also become vulnerable as more factors are combined and time of exposure is extended. Our results suggest that the risks involved for the utilization of harmful invasive species increase with mesophilic temperatures and single treatments if the processing conditions are not stabile. One-month treatment with windrow composting showed a high risk for dormant seeds of L. polyphyllus seeds to survive, whereby extending the processing time reduced it substantially. Hard coated seeds can thus be broken with a combination of thermophilic temperatures, moisture and static pressure.

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“…Increased precipitation can significantly increase ( Zheng et al 2005 ; Arfin-Khan et al . 2018 ), have no effect on ( Weltzin and Mcpherson 2000 ) or decrease ( Zhao et al 2012 ) seedling emergence (i.e.…”

Section: Introductionmentioning

confidence: 99%

Effects of increased precipitation on the life history of spring- and autumn-germinated plants of the cold desert annual Erodium oxyrhynchum (Geraniaceae)

et al. 2019

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Future increased precipitation in cold desert ecosystems may impact annual/ephemeral plant species that germinate in both spring and autumn. Our primary aim was to compare the life history characteristics of plants from spring-germinating (SG) and autumn-germinating (AG) seeds of Erodium oxyrhynchum. Plants in field plots with simulated increases in precipitation of 0, 30 and 50 % in spring and summer were monitored to determine seedling survival, phenology, plant size, seed production and biomass accumulation and allocation. Germination characteristics were determined in the laboratory for seeds produced by plants in all increased precipitation treatments. Increased precipitation in spring significantly improved survival of seedlings from SG and AG seeds, but survival was less for AG than SG. An increase in precipitation increased the number of seeds per plant for both SG and AG, but AG produced more seeds per plant than SG. With increased precipitation, percentage of dormant seeds from SG increased significantly, while that of AG decreased slightly. Our study suggests that with increased spring and summer rainfall AG will produce an increased number of nondormant seeds that could germinate in autumn and SG an increased number of dormant seeds that become part of the soil seed bank. However, ability of some seeds to germinate in autumn and others in spring will be maintained as long as soil moisture is limited in autumn.

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Factors influencing seedling emergence of three global invaders in greenhouses representing major eco‐regions of the world

Cited by 7 publications

References 48 publications

Germination of the invasive legume Lupinus polyphyllus depends on cutting date and seed morphology

Germination of the invasive legume Lupinus polyphyllus depends on cutting date and seed morphology

Risk of Invasive Lupinus polyphyllus Seed Survival in Biomass Treatment Processes

Effects of increased precipitation on the life history of spring- and autumn-germinated plants of the cold desert annual Erodium oxyrhynchum (Geraniaceae)

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