Discussion 4.docx - Why was the discovery of lignin in a red alga so surprising 1.2 billion years ago small red algae one of the groups of

Discussion 4.docx - Why was the discovery of lignin in a...

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Why was the discovery of lignin in a red alga so surprising? 1.2 billion years ago, small red algae, one of the groups of photosynthesis protists, was found as the oldest eukaryotic fossils. Red algae belong to Protista Kingdom and Rhodophyta Phylum and their habitat is in marine. Most of red algae have the variety in reddish color from greenish-red which is in shallow water to dark red or almost black in deep water by an accessory pigment named phycoerythrin. In hypothesis, red algae, green algae, and plants are included in one of the four supergroups of eukaryotes, Archaeplastida. As we know, land plants share a common ancestor with modern charophytes (green algae). Hence, even though red algae do not directly evolve to land plants, it is still related to the evolution of land plants and this evolution timeline is about billion years. Lignin is complex organic polymers that are deposited in the cell walls of many plants and make them strengthen and rigid. Lignin plays several crucial roles in plants. It prevents the absorption
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