Water Uptake and Transport in Vascular Plants
网页The bulk of water absorbed and transported through plants is moved by negative pressure generated by the evaporation of water from the leaves (i.e., transpiration) — this process is commonly ...
Diffusion and bulk flow of amino acids mediate calcium waves in plants
网页2022年10月21日 · In plants, a variety of stimuli trigger long-range calcium signals that travel rapidly along the vasculature to distal tissues via poorly understood mechanisms. Here, we use quantitative imaging and analysis to demonstrate that traveling calcium waves are mediated by diffusion and bulk flow of amino acid chemical messengers.
Chapter 36 - Transport in Vascular Plants - CourseNotes
网页Bulk flow functions in long-distance transport. Diffusion in a solution is fairly efficient for transport over distances of cellular dimensions (less than 100 microns). However, diffusion is much too slow for long-distance transport within a plant, such as the movement of water and minerals from roots to leaves.
Long-Distance Transport: The Role of Bulk Flow (Lecture 12)
网页Plants lose a large volume of water from transpiration. This creates a negative pressure at the stomatal opening (where water was lost). Water is replaced by the bulk flow of water and minerals, called xylem sap, that is transported from the …
Mass flow (life sciences) - Wikipedia
网页In general, bulk flow in plant biology typically refers to the movement of water from the soil up through the plant to the leaf tissue through xylem, but can also be applied to the transport of larger solutes (e.g. sucrose) through the phloem.
30.5: Transport of Water and Solutes in Plants
网页Describe how water potential, evapotranspiration, and stomatal regulation influence how water is transported in plants. Explain how photosynthates are transported in plants. The structure of plant roots, stems, and leaves facilitates the transport of water, nutrients, and photosynthates throughout the plant.
Chapter 24: Material movement and diffusion’s multiple roles in plant ...
网页Bulk flow is a much more effective means to transport materials over long distances than diffusion, which is only effective over very small distances (tenths of a mm for liquids). Bulk flow is blocked by cell membranes and is impeded, but not prevented, by cell walls.
How water flow, geometry, and material properties drive plant movements ...
网页2019年4月11日 · Plants are dynamic. They adjust their shape for feeding, defence, and reproduction. Such plant movements are critical for their survival. We present selected examples covering a range of movements from single cell to tissue level and over a range of time scales. We focus on reversible turgor-driven shape changes.
Bulk flow - Vocab, Definition, and Must Know Facts | Fiveable
网页Bulk flow is the movement of water and dissolved substances through a plant, driven by pressure differences rather than concentration gradients. This process is essential for transporting nutrients, water, and minerals from the roots to various parts of the plant, ensuring that all cells receive the necessary resources for growth and metabolism.
Plant, Cell & Environment - Wiley Online Library
网页2016年10月18日 · Water transport in plants occurs along various paths and is driven by gradients in its free energy. It is generally considered that the mode of transport, being either diffusion or bulk flow, is a passive process, although energy may be required to sustain the forces driving water flow.
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