Species-specific smoke effects on seed germination of plants from different habitats from Sri Lanka

Alahakoon, A. A. C. B.; Perera, G. A. D.; Merritt, David J.; Turner, Shane R.; Gama-Arachchige, N. S.

doi:10.1016/j.flora.2019.151530

Cited by 8 publications

(7 citation statements)

References 41 publications

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“…Alahakoon et al . (2020) reported dormancy in H. suaveolens , but the period of seed storage (seed age) was not mentioned. Seed storage in our study might have influenced germination ecology through the dry after‐ripening effects.…”

Section: Discussionmentioning

confidence: 99%

“…However, McIvor & Howden (2000) reported low dormancy in H. suaveolens seeds after storage of 16 weeks, which is similar to that in the present study. Alahakoon et al (2020) reported dormancy in H. suaveolens, but the period of seed storage (seed age) was not mentioned. Seed storage in our study might have influenced germination ecology through the dry after-ripening effects.…”

Section: Discussionmentioning

confidence: 99%

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Seed size dimorphism in Hyptis suaveolens aids in differentiation of the germination niche

et al. 2022

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Seed germination characteristics help predict the degree of invasive success of a species based on capacity of the seeds to germinate and recruit into novel habitats. Hyptis suaveolens (L.) Poit. (Bush mint, Pignut; Lamiaceae) is an invasive plant that is spreading throughout tropical and subtropical regions worldwide. We conducted a study to understand the role of seed size dimorphism in differentiation of germination niche in H. suaveolens. We subjected small and large seeds to varying environmental conditions of temperature (°C), photoperiod (light/dark), salt (NaCl; mM), pH, osmotic potential (MPa), different soil types and ratios (clay:sand) and burial depth (cm). Different germination indices were calculated and their interaction with seed dimorphism studied. There was a significant interaction (P < 0.001) between germination indices and seed dimorphism throughout the treatments. Large seeds had higher germination percentage and rate, indicating higher germination capacity. In addition, these displayed more asynchronous germination under various environments. Small seeds, on the other hand, required a longer germination time as compared to large seeds, indicating slower germination. Differential responses of the two seed morphs to varying environmental conditions, therefore, help H. suaveolens to differentiate its germination niche and establish in heterogeneous environments. These findings will help in devising appropriate management and eradication strategies based on germination ecology of seeds.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Seed size dimorphism in Hyptis suaveolens aids in differentiation of the germination niche

et al. 2022

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“…This hypothesis is similar to that of a heat-shock fire adaptation (Keeley et al, 2011; Moreira and Pausas, 2012), where soil temperatures that can only occur during fire heating are required overcome dormancy (Ooi et al, 2014). It is possible that testing different smoke concentrations would have stimulated germination in more species, or to higher levels (Çatav et al, 2014; Moreira and Pausas, 2018; Alahakoon et al, 2020), meaning that this obligate requirement could occur across a greater range of species.…”

Section: Discussionmentioning

confidence: 99%

Investigation of 18 physiologically dormant Australian native species: germination response, environmental correlations and the implications for conservation

Collette

Ooi

2020

Seed Sci. Res.

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For physiologically dormant (PD) species in fire-prone environments, dormancy can be both complex due to the interaction between fire and seasonal cues, and extremely deep due to long intervals between recruitment events. Due to this complexity, there are knowledge gaps particularly surrounding the dormancy depth and cues of long-lived perennial PD species. This can be problematic for both in situ and ex situ species management. We used germination experiments that tested seasonal temperature, smoke, dark and heat for 18 PD shrub species distributed across temperate fire-prone Australia and assessed how germination was correlated with environmental factors associated with their home environments. We found extremely high levels of dormancy, with only eight species germinating above 10% and three species producing no germination at all. Seven of these eight species had quite specific seasonal temperature requirements and/or very strong responses to smoke cues. The maximum germination for each species was positively correlated with the mean temperature of the source population but negatively correlated with rainfall seasonality and driest months. The strong dependence on a smoke cue for some of the study species, along with examples from other studies, provides evidence that an obligate smoke response could be a fire-adapted germination cue. Germination response correlated with rainfall season of the source populations is a pattern which has often been assumed but little comparative data across sites with different rainfall seasonality exists. Further investigation of a broader range of species from different rainfall season environments would help to elucidate this knowledge gap.

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“…Due to the observations of the action of KARs in the environment related to the presence of these substances in the smoke accompanying fires, most studies concern their use in seed germination [Alahakoon et al 2020, Bursch et al 2021, Isoda et al 2021]. In experiments conducted on Brassica oleracea, a positive effect of this group of regulators on seed germination was demonstrated.…”

Section: Effect On Seed Germinationmentioning

confidence: 99%

Karrikins – effect on plants, interaction with other growth regulators, and potential use in horticulture

Marciniak,

Sochacki,

Nowakowska

2023

Acta Sci. Pol. Hortorum Cultus

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Karrikins are a group of chemicals found in plant-derived smoke from burning plant material. Till now, scientists concentrated on their effect on seed germination in plants sensitive to smoke. However, there are reports on the effect of karrikins on physiology and morphology in plants which do not occur in fire areas and are not naturally treated by smoke. These chemicals positively affect the biometric parameters of the in vitro cultured plants. Recently, their effect on germination rate of pollen in several species has been confirmed. They interact with plant growth regulators enhancing their effects, for example using them together with auxins, cytokinins, gibberellins, abscisic acid or ethylene. This paper contains a review of present research on karrikins and proposes perspectives of further investigations, as well as application of these chemicals in horticultural production as a new group of plant growth regulators.

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Species-specific smoke effects on seed germination of plants from different habitats from Sri Lanka

Cited by 8 publications

References 41 publications

Seed size dimorphism in Hyptis suaveolens aids in differentiation of the germination niche

Seed size dimorphism in Hyptis suaveolens aids in differentiation of the germination niche

Investigation of 18 physiologically dormant Australian native species: germination response, environmental correlations and the implications for conservation

Karrikins – effect on plants, interaction with other growth regulators, and potential use in horticulture

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