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Plants conquer Land and Bryophytes Notes

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Biology (Biological Sciences)
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January 30, 2013 - Lecture 9: Plants conquer Land/Bryophytes Kingdom Plantae  most live in terrestrial environments ex: deserts, grasslands & forests  some have returned to aquatic habitats o most of these to fresh water, a few to marine water  oldest terrestrial photosynthesizers cyanobacteria ~1.2 BYA Main• eorminder: 4 Main Groups of plants: Plantae shares a 1. non-vascular plants 2. seedless vascular plants ancestoi. e.g. Ferns 3. gymnospermsalgae i. e.g. Conifers 4. angiospermseen algae, plants.shared with charophytes flowering most closeplants  reminder: Kingdom Plantae sharcharophytes ancestoreral w/ the green algae  within green algae, plants with mostthink this?lated to charophytes (look at diagram  ) these are: Fig. 29.2 Feat• 1() rosette-shaped cellulose- Fig. 28.3 Charopsynthesizing complexes  land plants share several synapomoa trait that is shared ("symmorphy") by two or more taxa and their most recent common ancestor, whose cell walltor in turn does notfeatures w/e trait) charophyte algae – 1. rosette-shaped cellulose-synthesizing compla decorative rosette alaemake cellulose microfibrils of the cell wall  are liner in non-charophycean algae 2. structure of the sperm resembles the sperm of charophytes  but only for those plants w/ flagellated sperm 3. presence of phragmoplast during cell division  helps construct cell plate between incipient cells, which goes on to become new cell wall Dividing line?  With all of these similarities, should charophytes be considered plants as well?  And what about chlorophyte algae, which share pigment characteristics? Dividing line? You could put chlorophtes, charophyceans and embrophytes together as Kingdom Viridiplantae o Virid = green • w ith all of these similarities,  But our text sticks with Kingdom Plantae = embryophyes should charophytes be considered ‘plants’ as well? • a nd what about chlorophyte algae, which share pigment characteristics ? • could put chlorophytes, charophyceans and embryophytes together a
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