Epicotyl morphophysiological dormancy and storage behaviour of seeds of <i>Strychnos nux-vomica, Strychnos potatorum</i> and <i>Strychnos benthamii</i> (Loganiaceae)

Muthuthanthirige, D.L.; Wijetunga, W. M. G. A. S. T. B.; Jayasuriya, K.M.G. Gehan

doi:10.1017/s0960258520000203

Cited by 3 publications

(2 citation statements)

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“…Fourteen of the study species have been previously studied and dormancy classes were identified or speculated. Six of the above 14 species have previously been studied in different ecosystems [Urophyllum ceylanicum, Turpinia malabarica, Bhesa nitidissima and Eurya ceylanica in tropical mountain forests (Athugala et al, 2021), and Messua ferrea (Troup, 1921;Joshi et al, 2015) and Dillenia indica (Thapliyal et al, 2008) in tropical semi-evergreen forests], while the rest of the species (eight) have been studied in the same ecosystem [Mangifera zeylanica and Dipterocarpus zeylanicus (Holmes, 1954), Shorea affinis (Tompsett, 1998) S. trapezifolia (de Zoysa, 1986) Strychnos benthamii (Muthuthanthirige et al, 2020) Humboldtia laurifolia (Jayasuriya et al, 2010), Gomphia serrata (Ng, 1992) and P. mooniana (Jayasuriya et al, 2013)]. The previously reported dormancy class (PD) of Bheasa nitidissima, Eurya ceylanica and Gomphia serrata are identified as ND in the present study.…”

Section: Discussionmentioning

confidence: 99%

Seed dormancy and germination behaviour of tropical rainforest tree species from Sri Lanka

Samarasinghe

Jayasuriya²,

Gunaratne³

et al. 2022

Seed Sci. Res.

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Plant community-level studies on seed dormancy traits are important to understand and determine the significance of seed dormancy in different ecosystems. Hence, we studied seed dormancy and other related seed biological traits of 42 selected tropical lowland rainforest tree species from Sri Lanka, aiming to address seed dormancy class(es) for a biodiverse tropical lowland wet zone forest community and the relationship between dormancy classes, forest strata and seed dispersal mechanisms. Seed germination, imbibition, embryo length:seed length ratio, embryo morphology and the effect of gibberrelic acid on seed germination were determined. Sixty-two percent of the species with T50 < 30 days were identified as having fast-germinating seeds and the remaining 38% with T50 > 30 possessed slow-germinating seeds. Seeds of 33 species had fully developed embryos, while nine species had underdeveloped embryos; three had morphological dormancy (MD) and six morphophysiological dormancy (MPD). Treatment with gibberellic acid revealed physiological dormancy (PD) in seeds of six species, and the response to manual scarification confirmed physical dormancy (PY) in seeds of Pericopsis moonina. The majority of tropical lowland rainforests had non-dormant (ND) species (62%), and 14.3, 14.3, 7 and 2.3% of the species had MPD, PD, MD, and PY, respectively. Non-dormancy decreased for taxa from the upper strata to the lower strata of the forest. ND seeds were dispersed during the rainy season. Thus, non-dormancy seems to be the most dominant germination behaviour among the tree species in the lowland rainforest of Sri Lanka with the class of dormancy related to forest strata and dispersal time.

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Section: Discussionmentioning

confidence: 99%

Seed dormancy and germination behaviour of tropical rainforest tree species from Sri Lanka

Samarasinghe

Jayasuriya²,

Gunaratne³

et al. 2022

Seed Sci. Res.

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“…We may, however, expect other relationships in less seasonal tropical areas, for which very little is known (with some exceptions, e.g. Muthuthanthirige et al , 2020 ). For example, a strong positive relationship has been observed for relative embryo size and seed size ( Vandelook et al , 2012 ).…”

Section: Case Example 2: Bias Of Relative Embryo Size and Post-disper...mentioning

confidence: 99%

Low availability of functional seed trait data from the tropics could negatively affect global macroecological studies, predictive models and plant conservation

et al. 2022

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Background Plant seeds have many traits that influence ecological functions, ex situ conservation, restoration success and their sustainable use. Several seed traits are already known to vary significantly between tropical and temperate regions. Here we present three additional traits for which existing data indicate differences between geographical zones. We discuss evidence for geographical bias in availability of data for these traits, as well as negative consequences of this bias. Scope We reviewed the literature on seed desiccation sensitivity studies that compare predictive models to experimental data and show how a lack of data on populations and species from tropical regions could reduce the predictive power of global models. In addition, we compiled existing data on relative embryo size and post-dispersal embryo growth and found that relative embryo size was significantly larger, and embryo growth limited, in tropical species. The available data showed strong biases towards non-tropical species and certain families, indicating that these need to be corrected to perform truly global analyses. Furthermore, we argue that the low number of seed germination studies on tropical high-mountain species makes it difficult to compare across geographical regions and predict the effects of climate change in these highly specialized tropical ecosystems. In particular, we show that seed traits of geographically restricted páramo species are studied less than those more widely distributed, with most publications unavailable in English or in the peer-reviewed literature. Conclusions The low availability of functional seed trait data from populations and species in the tropics can have negative consequences for macroecological studies, predictive models and their application in plant conservation. We propose that global analyses of seed traits with evidence for geographical variation prioritise generation of new data from tropical regions as well as multi-lingual searches of both grey- and peer-reviewed literature in order to fill geographical and taxonomical gaps.

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Regeneration in recalcitrant-seeded species and risks from climate change

Pritchard

Sershen

Tsan

et al. 2022

Plant Regeneration From Seeds

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Epicotyl morphophysiological dormancy and storage behaviour of seeds of Strychnos nux-vomica, Strychnos potatorum and Strychnos benthamii (Loganiaceae)

Cited by 3 publications

References 38 publications

Seed dormancy and germination behaviour of tropical rainforest tree species from Sri Lanka

Seed dormancy and germination behaviour of tropical rainforest tree species from Sri Lanka

Low availability of functional seed trait data from the tropics could negatively affect global macroecological studies, predictive models and plant conservation

Regeneration in recalcitrant-seeded species and risks from climate change

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