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Unformatted text preview: BIO 311D 19/11/2007 09:57:00 ← TRANSPORT IN PLANTS ← ← OVERVIEW: ← Proton pumps play a central roe in the transport across plant membrane ← Vacuolated plant cells have three major compartments ← Bulk flow functions in long-distance transport ← In flowering plants and other vascular plants, the flow of water and solutes connects all cells of the plant ← Water absorbed from soil moves on up through xylem and into leaves ← By the energy-requiring process of translocation, sucrose and other organics are distributed in the plant ← ← Proton pump—chemiosmosis • cost: ATP energy • functions by: H+ gradient • results: cation driven and co-transport of anions and neutral solute ← ← Cellular level and plant level • cellular level o tonoplast o cell membrane • plant level o apoplast o symplast ← ← Vascular cylinder • tracheids and vessels in the xylem •...
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