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2020
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2020
Journal article
Comparative in vitro seed germination and seedling development in tropical and temperate epiphytic and temperate terrestrial orchids
Ex situ conservation of orchid seeds requires the application of modern biotechnology to determine seed quality and to optimise in vitro regeneration. The nutrient requirements for germination and seedling growth in vitro can be species-specific and influenced by life history traits and habitats. Therefore, this study aimed to explore in... -
2020
Journal article
Seed Survival at Low Temperatures: A Potential Selecting Factor Influencing Community Level Changes in High Altitudes under Climate Change
In alpine ecosystems, imbibed seeds are often exposed to temperatures as low as −35 °C, challenging their survival in the soil. Here, we show that seeds have mechanisms to survive cold climate prevalent in alpine ecosystems and have identified three such mechanisms from existing literature, including two forms of freezing avoidance...Jaganathan, Ganesh K. ; Dalrymple, Sarah E. ; Pritchard, Hugh W.
Boreal, supercooling, freezing tolerance, freezing avoidance, and species migration
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2020
Journal article
The Cryobiotechnology of Oaks: An Integration of Approaches for the Long-Term Ex Situ Conservation of Quercus Species
Conventional dry seed storage is unlikely for about one third of all tree species (and nearly half of evergreen rain forest trees) as they probably produce desiccation sensitive (recalcitrant) seeds. Consequently, international ex situ conservation targets for threatened trees will be difficult to achieve without innovation, especially in cryobiotechnology. We...Ballesteros, Daniel ; Pritchard, Hugh W.
recalcitrant seeds, cryopreservation, pollen, embryonic axes, DOE, tree genetic resources, shoot tips, in vitro culture, and dormant buds
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2021
Journal article
Thermal niche for germination and early seedling establishment at the leading edge of two pine species, under a changing climate
Pines are the most popular species for reforestation in Mexico, however reforestation programs have little success due to a high mortality of pine seedlings. Shifts in the distribution range due to climate change has been predicted for many species specially at their distribution borders. Understanding the thermal limits of germination... -
2020
Journal article
Differential Interpretation of Mountain Temperatures by Endospermic Seeds of Three Endemic Species Impacts the Timing of In Situ Germination
Predicting seed germination in the field is a critical part of anticipating the impact of climate change on the timing of wild species regeneration. We combined thermal time and soil heat sum models of seed germination for three endemic Mediterranean mountain species with endospermic seeds and morphophysiological dormancy: Aquilegia barbaricina,... -
2020
Journal article
Unlocking plant resources to support food security and promote sustainable agriculture.
Societal Impact Statement Biodiversity is essential to food security and nutrition locally and globally. By reviewing the global state of edible plants and highlighting key neglected and underutilized species (NUS), we attempt to unlock plant food resources and explore the role of fungi, which along with the wealth of traditional... -
2020
Journal article
Dry architecture: towards the understanding of the variation of longevity in desiccation-tolerant germplasm
Desiccation-tolerant (DT) plant germplasm (i.e. seeds, pollen and spores) survive drying to low moisture contents, when cytoplasm solidifies, forming a glass, and chemical reactions are slowed. DT germplasm may survive for long periods in this state, though inter-specific and intra-specific variation occurs and is not currently explained. Such variability has...Ballesteros, Daniel ; Pritchard, Hugh W. ; Walters, Christina
solidified cytoplasm, seeds, oxidative stress, photosynthetic stress, spores, and lipid crystallization
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2020
Journal article
The negative effect of a vertically-transmitted fungal endophyte on seed longevity is stronger than that of ozone transgenerational effect
Seed morphology underpins many critical biological and ecological processes, such as seed dormancy and germination, dispersal, and persistence. It is also a valuable taxonomic trait that can provide information about plant evolution and adaptations to different ecological niches. This study characterised and compared various seed morphological traits, i.e., seed and...Dantas, Barbara F. ; Moura, Magna S. B. ; Gundel, Pedro E. ; McGill, Craig ; Seal, Charlotte E. …
Maternal effect, Lolium multiflorum, Italian ryegrass, and Epichloë occultans
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2020
Journal article
Storage of orchid pollinia with varying lipid thermal fingerprints
Orchid pollinia have the potential to make a valuable contribution to current techniques of germplasm storage and assisted reproduction, yet information regarding their preservation and their ability to remain viable over time is currently limited. Dactylorhiza fuchsii and Disa uniflora were used as models for investigating potential techniques for storing...Custodio, Ceci Castilho ; Machado-Neto, Nelson B. ; Singer, Rodrigo B. ; Pritchard, Hugh W. ; Seaton, Philip T. …
Orchidaceae, Conservation , Germplasm, and Pollen germination