Complexities in identifying seed storage behavior of hard seed-coated species: a special focus on Lauraceae

Jaganathan, Ganesh K.; Li, Jiajin; Yang, Yashu; Han, Yingying; Liu, Baolin

doi:10.1080/23818107.2018.1563566

Cited by 8 publications

(8 citation statements)

References 29 publications

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“…They found that extant lineages with fossil records that extend into the Cretaceous first evolved this trait independently during Kauffman et al, 1990;Johnson, 2002;Barclay et al, 2003;Johnson et al, 2003;Berry, 2019a Lauraceae (cuticle) 3 Subbiah et al (2019) are supported by contemporary perspectives on the evolution of seed recalcitrance, as the high moisture content of these seeds produced by tropical phanerophytes in megathermal, equable climates with high precipitation/humidity precludes their long-term survival of seeds under drying and freezing conditions (Hong et al, 1997;Wyse and Dickie, 2017). Laurales, which in this study is regarded as producing recalcitrant seeds, is the only clade included in this study that does not exhibit monomorphism for seed recalcitrance among its extant members (Wyse and Dickie, 2017;Jaganathan et al, 2019). The reason for including this clade in this study is that Chen et al 2020recently identified an autapomorphic genetic marker for abscisic acid-inhibition associated with seed recalcitrance among the species in this clade; in accordance with the perspective of Subbiah et al 2019, therefore, it appears that lauraceous species evolved this trait during the late Cretaceous, because this genetic marker appears to be shared among all sampled genera in this clade, regardless of whether this gene is currently expressed among all of these genera (e.g., Jaganathan et al, 2019).…”

Section: Methodsmentioning

confidence: 70%

“…Based on the available evidence, I suggest that the overall pattern of survival is consistent with selection for tropical plant taxa that survived on the margins of their range. This is bolstered by the interpretation that many extant lauraceous species are on the border of recalcitrant/intermediate in terms of seed behavior, including some of those that are superficially similar to those that first appear in western North America slightly above the K/Pg boundary (e.g., Jaganathan et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Laurales, which in this study is regarded as producing recalcitrant seeds, is the only clade included in this study that does not exhibit monomorphism for seed recalcitrance among its extant members (Wyse and Dickie, 2017;Jaganathan et al, 2019). The reason for including this clade in this study is that Chen et al 2020recently identified an autapomorphic genetic marker for abscisic acid-inhibition associated with seed recalcitrance among the species in this clade; in accordance with the perspective of Subbiah et al 2019, therefore, it appears that lauraceous species evolved this trait during the late Cretaceous, because this genetic marker appears to be shared among all sampled genera in this clade, regardless of whether this gene is currently expressed among all of these genera (e.g., Jaganathan et al, 2019). Interestingly, this mechanism behind recalcitrant seeds (i.e., genetically based transcription factors that regulate abscisic acid inhibition) is widely recognized as being the general cause of seed recalcitrance in most plants included in this study (Farnsworth, 2000), particularly Austrobaileyales (Smiskova et al, 2005) and Laurales (Chen et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

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Seed traits linked to differential survival of plants during the Cretaceous/Paleogene impact winter

Berry¹

2020

Acta Palaeobotanica

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In past investigations the pattern of differential survival of plants across the K/Pg boundary has been viewed as incompatible with severe asteroid impact winter scenarios (i.e., an impact winter lasting more than a few months), particularly the enigmatic survival of coryphoid palms and Pandanus (screw pine). Stateof- the-art climate models based on soot, sulfate and nano-sized dust aerosols predict a global impact winter that drastically reduced precipitation and resulted in a transient period of total darkness and permafrost conditions. This suggests that the plants most likely to have been affected by the global mass-extinction event were tropical phanerophytes that produce recalcitrant seeds, which by definition are desiccation-intolerant, survive less than a year, and cannot survive freezing. However, this hypothesis has never been tested. In this study I sampled over 100 plant species from the global fossil record that have a high probability of having produced either recalcitrant seeds/disseminules (n1 = 58) or orthodox seeds (n2 = 59), based on their phylogenetic relationships with extant taxa that either are monomorphic for these traits or specifically exhibit a genetic marker for abscisic acid inhibition associated with seed dormancy and recalcitrance. A one-tailed z-test for the difference between two proportions revealed that plant taxa with a high probability of having produced recalcitrant seeds had significantly lower survivorship than plant taxa with a high probability of having produced orthodox seeds (p < 0.0001). Based on these data, it can be concluded that plants which formed a frost-tolerant seed bank during the latest Maastrichtian were significantly more likely to survive the K/Pg impact winter than plants which did not (including palms). These data clearly indicate that the K/Pg impact winter probably lasted longer than a year and that it selected for seed-based traits that effectively sorted correlated functional traits of mature plants (i.e., leaf physiognomic features). This novel hypothesis stands as an alternative to J.A. Wolfe’s classic hypothesis that a mild K/Pg impact winter selected for fast-growing angiosperms with deciduous leaves and did not affect the plant communities of the Southern Hemisphere. Potential mechanisms for the rare survival of tropical, recalcitrant-seeded plants are discussed.

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Section: Methodsmentioning

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Seed traits linked to differential survival of plants during the Cretaceous/Paleogene impact winter

Berry¹

2020

Acta Palaeobotanica

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“…C. aschersoniana is typical of Brazilian subtropical forests and, in lower latitudes, often appears in higher altitude forest (Lorenzi, 1998). Seeds are released at the end of the rainy season (Hirano, 2004) and they need to survive through a cold and dry season and remain dormant until the conditions are favorable for germination and seedling development, as reported by Jaganathan et al (2019), who described the behaviour of seeds of several Lauraceae species that are dispersed with nondeep physiological dormancy that can be released by cold stratification. Similar adaptations are common in recalcitrant seeds of temperate species, as seen in acorns oak (Pasquini et al, 2011(Pasquini et al, , 2012.…”

Section: Resultsmentioning

confidence: 99%

“…The Lauraceae family is one of the most diverse in Brazilian forestry formations, with species frequently being found in the remaining riparian forests in Southeast Brazil. Some species of this family belong to the ecological group clímax (Lorenzi, 1998) and produce seeds irregularly that are generally sensitive to desiccation (Carvalho et al, 2008;Vicente et al, 2016) and, in some cases, with dormancy (Jaganathan et al, 2019). In particular, seeds of Cryptocarya aschersoniana have been reported to be sensitive to desiccation (Carvalho, 2000;Hirano, 2004;Muxfeldt et al, 2012).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Physiological and Cellular Changes of Stored Cryptocarya aschersoniana Mez. Seeds

et al. 2021

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Some species of the Lauraceae family produce seeds that are generally sensitive to desiccation, which makes them difficult to store. The objective of this study was to characterize changes in seed quality of C. aschersoniana from two lots, as well in the physiological and cellular aspects during 12 months of storage. Seeds were stored with their original moisture content (MC) or after pre-drying to 35% MC in a cold chamber (5 °C) at a relative humidity of 40%. Seeds were sampled and tested at time 0, 3, 6 and 12 months of storage regarding to moisture content, germination and ultrastructural features. The seeds were dispersed with dormancy that was overcame by the cold storage condition and the reserves in undried seeds were partly consumed during storage. Both undried and pre-dried seeds remained viable for at least 12 months.

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Ecological insights into the coexistence of dormancy and desiccation-sensitivity in Arecaceae species

Jaganathan

2021

Annals of Forest Science

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Key message Mechanisms controlling germination of > 2600 Arecaceae species adapted to the tropical forests are not clearly understood. This contribution underpins the notion that the coexistence of dormancy and desiccation sensitivity in some Arecaceae species could significantly affect the germination ecology. Although the evolutionary and ecological significance behind this occurrence is unknown, these traits together could limit the germination from inappropriate depths and allow dispersal.• Context Dormancy and desiccation sensitivity, i.e., recalcitrance, are considered as mutually exclusive traits that evolved to maximize seed survival after dispersal; the former by allowing seeds to spread germination risk temporally then synchronize germination with a favorable growing season, and the latter by allowing germination immediately. However, a few species from temperate ecosystems have been known to produce seeds that are both dormant and desiccation-sensitive, but little is known about such a relationship in the tropical forests.• Aims To understand if desiccation sensitivity and dormancy can coexist in Arecaceae species, distributed predominantly in the tropical forests, and compare the seed traits found in Arecaceae species with other desiccation-sensitive species.• Methods Information published in international peer-reviewed journals was reviewed and a database with records on seed dormancy and desiccation sensitivity was created and discussed. • ResultsThis literature survey has identified diaspores of 34 Arecaceae species that have both desiccation-sensitivity and an underdeveloped, small embryo, i.e., morphophysiological dormancy or morphological dormancy. In Arecaceae species, desiccation-sensitivity is neither confined to large-sized diaspores, nor all species adapted to dry ecosystems disperse diaspore during the wet-season; features reported to be prevalent in desiccation-sensitive species of other families. Endocarp is proposed to act as a mechanical barrier preventing water loss and also offer protection against physical damage; however, the extent of protection against water loss from internal structures is contentious. • ConclusionThe possible ecological significance of this unique relationship noted in Arecaceae is currently unknown, and this review puts forward "testable" hypotheses that call for more studies on germination ecology focusing on dispersal and burial.

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Complexities in identifying seed storage behavior of hard seed-coated species: a special focus on Lauraceae

Cited by 8 publications

References 29 publications

Seed traits linked to differential survival of plants during the Cretaceous/Paleogene impact winter

Seed traits linked to differential survival of plants during the Cretaceous/Paleogene impact winter

Physiological and Cellular Changes of Stored Cryptocarya aschersoniana Mez. Seeds

Ecological insights into the coexistence of dormancy and desiccation-sensitivity in Arecaceae species

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