AEBI 210 Lecture Notes - Jungermanniales, Green Algae, Vascular Tissue
Document Summary
Algae requires moist conditions, so can not survive on land. Plants had to adapt to be able to move to land. Cooksonia, which is non-vascular, is the first known land plant. Green algae was likely the ancestor to land plants. Roots developed to anchor the plant and absorb water and minerals. Developing support cells to grow tall above other plants. Stomata take in gasses during the day, and close to maintain water during the night. Allows for better rooting, gamete protection and growth to obtain sunlight. Vascular tissue had to develop to transport water to all cells. The sporophyte (2n) stage became dominant over the gametophyte (n) stage. Thalloid or leafy plants that grow close to the ground in mostly moist locations. Have apical meristems, rhizoids, stomata and cuticle but no vascular tissue or lignin. Reproduce by sporic meiosis, with sporophytes that develop from the gametophyte. Gametophores are the leafy structures which produce archegonia and antheridia.