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Bio1020, Diversity of Life: February 12.docx

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BIOL 1020
Robert Laird

February 12, 2014 - Biology Archaeplastida • Supergroup includes red algae, green algae, land plants • Descended from an ancient protest that engulfed a cyanobacterium (i.e., endosymbiosis) Red Algae (Rhodophyta) • ~6000 described species • Basal group within archaeplastida, diverged the earliest • No defined by its colors: some red algae is green. • Mostly marine (mostly tropical and sub-tropical) • Cellulose and alginic acid cell wall • No motile stages (not mobile) o No flagellated types • Many are parasites (not all are parasites) • Accessory pigments (phycobilins) impart red colour • Floridean starch as a storage product • Mostly filamentous • Complex life cycles • Pit connections: o Go between cells, function may have to do with communication between cells, • Polysiphonia: Has two distinct sporophyte stages: o Carposporophyte 2n o Tetrasporophyte 2n • Deep-water algae are mostly red algae o Compensation point  Where photosynthetic rate matches the respiration rate  Higher-energy light (lower wavelength) penetrates the water further Green Algae: • Green algae are named for their grass-green chloroplasts • Plants are descended from the green algae • The two main groups are cholorophytes and charophytes • Charophytes are most closely related to land plants
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