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Journal article
Structure and abnormalities in cones of the Wollemi pine (Wollemia nobilis)
Reproductive structures of both genders of Wollemia nobilis were investigated, including both wild-type and teratological cones. Typically, both pollen cones and seed cones in this species are terminal on first order branches. At maturity, wild-type pollen cones are pendulous and cylindrical; wild-type seed cones are broad and ellipsoidal in shape....Dörken, Veit ; Rudall, Paula
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Journal article
Leaf surface development and the plant fossil record: stomatal patterning in Bennettitales
Stomata play a critical ecological role as an interface between the plant and its environment. Although the guard-cell pair is highly conserved in land plants, the development and patterning of surrounding epidermal cells follow predictable pathways in different taxa that are increasingly well understood following recent advances in the developmental...Rudall, Paula ; Bateman, Richard
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Journal article
Epidermal patterning and stomatal development in Gnetales
The gymnosperm order Gnetales, which has contentious phylogenetic affinities, includes three extant genera (Ephedra, Gnetum, Welwitschia) that are morphologically highly divergent and have contrasting ecological preferences: Gnetum occupies mesic tropical habitats, whereas Ephedra and Welwitschia occur in arid environments. Leaves are highly reduced in Ephedra, petiolate with a broad lamina...Rudall, Paula ; Rice, Callie
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Journal article
Dynamics of intracellular mannan and cell wall folding in the drought responses of succulent Aloe species
Plants have evolved a multitude of adaptations to survive extreme conditions. Succulent plants have the capacity to tolerate periodically dry environments, due to their ability to retain water in a specialized tissue, termed hydrenchyma. Cell wall polysaccharides are important components of water storage in hydrenchyma cells. However, the role of...Ahl, Louise ; Mravec, Jozef ; Jørgensen, Bodil ; Rudall, Paula ; Rønsted, Nina …
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Journal article
Embolism resistance in petioles and leaflets of palms
Hydraulic studies are currently biased towards conifers and dicotyledonous angiosperms; responses of arborescent monocots to increasing temperature and drought remain poorly known. This study aims to assess xylem resistance to drought-induced embolism in palms.We quantified embolism resistance via P50 (xylem pressure inducing 50% of embolism or loss of hydraulic conductivity)...Emilio, Thaise ; Lamarque, Laurent ; Torres-Ruiz, José ; King, Andrew ; Charrier, Guillaume …
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Journal article
Cryptic species in an ancient flowering-plant lineage (Hydatellaceae, Nymphaeales) revealed by molecular and micromorphological data
The flora of the southwestern Australian biodiversity hotspot is rich in endemic species, many of which remain to be discovered or properly described; estimates of species diversity and levels of endemism should take into account the possible occurrence of cryptic species. Here we explore taxonomic diversity in a Western Australian...Sokoloff, Dmitry ; Marques, Isabel ; Macfarlane, Terry ; Remizowa, Margarita ; Lam, Vivienne …
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Journal article
Coenocytic growth phases in land plant development: a paleo-evo-devo perspective
Premise of research.?The evolutionary origin of the seed habit coincided with profound physiological and structural changes associated with underlying developmental patterns. A coenocyte is formed during megagametophyte development in many vascular plants, including some lycophytes and all spermatophytes; this structure compares closely with similar free-nuclear growth phases during embryo development...Rudall, Paula ; Bateman, Richard