BIOL 1503 Lecture : New Plant Physiology Notes
Document Summary
Adaptations for acquiring resources were key steps in the evolution of vascular plants. The algal ancestors of land plants absorbed water, minerals, and co2 directly from the surrounding water. Early nonvascular land plants lived in shallow water and had aerial shoots: natural selection favored taller plants with flat appendages, multicellular branching roots, and efficient transport. In sunny locations, vertical leaves are less damaged by sun and allow light to reach lower leaves. 3 scales of transport in vascular plants occurs on three scales. Transport of water and solutes by individual cells, such as root hairs. Short-distance transport of substances from cell to cell at the levels of tissues and organs. Long-distance transport within xylem and phloem at the level of the whole plant. Short distance trans of sloutes across plasm membrane: plasma membrane permeability controls short-distance movement of substances, both active and passive transport occur in plants. In plants, membrane potential is established through pumping h+ by proton pumps.
