01:119:116 Lecture Notes - Lecture 10: Meristem, Phyllotaxis, Vascular Tissue
9 Apr 2016
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Document Summary
For vascular plants: the evolutionary journey onto land involved the differentiation of the plant body into roots and shoots. Vascular tissue: transports nutrients throughout a plant; such transport may occur over long dis- tance: land plant acquire resources both above and below ground. Algal ancestors of land plants absorbs h2o, minerals, and co2 directly from surrounding water als, and produces of photosynthesis and minimizing water loss. Evolution of xylem and phloem in land plants > long-distance transport of h2o, miner- Adaptations in each species represent compromises between enhancing photosynthesis. Shoot architecture and light capture stem: conduits for water and nutrients; supporting structures for leaves. Phyllotaxy: arrangement of leaves on stem; specific to each species; determined by apical meristem light absorption affected by leaf area index total upper leaf surface of plant / surface area of land on which it grow. Root architecture and acquisition of water and minerals. Taproot system: anchor plants; characteristic of most trees.
