Chapter 29 SG - Chapter 29 4 Traits- shared between plants...

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Chapter 29 4 Traits- shared between plants and charophyceans making them closest to plants a. Rose-shaped Complexes for cellulose synthesis /rosette cellulose-synthesizing complexes b. Peroxisome Enzyme- minimizes loss of organic products due to photorespiration c. Flagellated Sperm Structure- land plants have flagellated sperm closely resembling those of charophycean sperm d. Fragmoplast Formation- the “cleavage furrow” counterplant due to cell division’s cell plate; forms fragmoplast Genetic Evidence- despite the charophycean’s close semblance to plants, currently living algae are NOT ancestors of plants Sporopollenin- mobility adaptation from sea to land; prevents exposed zygote from drying out; first adaptation for land plants from charo. Current Plant Taxonomy Debate: Plantae Streptophyta (Charophyceans) Viridiplantae (Chlorophytes) ancestral alga including red algae 5 Traits- distinguishes plants from charophyceans a. Apical Meristem- constantly dividing cells at tips and shoots of plants; elongates (meristem) and widens (cambium) b. Alternation of Generations- 2 multicellular bodies (haploid [ gametophyte ] after spore; diploid [ sporophyte] after zygote) c. Walled-Spores produced in Sporangia- sporangia is multicell-organ; sporocytes (spore mother) spores thru meiosis; protected d. Mutlicellular Gametangia- gamete production thru multi-cell organs; male= antheridia , female= archegonia e. Muticellular, Dependent Embryos- embryo requires placental transfer cells for parental nutrient; derived trait of
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This note was uploaded on 08/27/2010 for the course BIO 8432 taught by Professor Lang during the Spring '10 term at Northwestern IA.

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