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Testing the Limits: Understanding How Climate and Competition Affect Species' Ranges in a Warming World
What factors determine where species occur, known as their geographic range limits? This classic ecological question has fascinated scientists for centuries, and is even more relevant today, in the face of anthropogenic climate change. Unfortunately, despite decades of research, we still lack a full understanding of the ...
The what, when & how of seedling growth regulation.
Photomorphogenesis has two stages. First, seedlings detect light and open their embryonic leaves (cotyledons). Second, seedlings optimize their light environment by regulated elongation of the embryonic stem (hypocotyl). Several hormones, including auxin, brassinosteroids (BR) and gibberellins (GA), orchestrate the growth of ...
Exclusion, Amelioration, Tolerance: An investigation of the physiological basis for tolerance in serpentine Mimulus guttatus
As sessile organisms, plants must cope with a variety of abiotic stress factors, including the mineral composition of soil. In serpentine soils, the low calcium-to-magnesium ratio has been shown to limit the growth and survival of many plant species. Some species are adapted to serpentine, employing a variety of physiological ...
From Cells to Canopies: Reconstructing Vegetation Structure and its Response to Climate Change in the Middle Cenozoic of Patagonia Using Phytolith Morphology
Reconstructing ancient ecosystems to answer outstanding questions in paleoecology requires a multidisciplinary approach. This dissertation research integrates geochronology and conventional phytolith analysis, with a new method for reconstructing vegetation structure (Leaf Area Index) based on the response of epidermal cell ...
Stem cells and fate control in plant stomatal development
The plant epidermis is a critical interface between the atmosphere and internal plant tissues, which allows plants to succeed on land by restricting their exposure to the environment. Stomata, closable pores on the plant surface bounded by specialized guard cells, are an integral part of epidermal function. By controlling ...