BIO153H5 Lecture Notes - Lecture 7: Lignin, Phylogenetic Tree, Flowering Plant

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29 Jan 2014
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Different types of chlorophyll - chlorophyll a, chlorophyll b, -carotene. Chlorophyll a might be a synapomorphic trait - found on multiple branches; no common ancestor. Found in many branches of the eukaryote tree - in algae and in plants. Could be better in different environments - light vs. dark. Each combination of pigments allows them to absorb different areas on the light spectrum - avoids competition with other plants. Began with green algae (725 mya), cooksonia pertoni (475 mya), the first land plant. Green algae and land plants share characteristics - a hint that land plants came from green algae. Presence of chlorophyll a and b, -carotene. Peroxisomes (specialized oxygen processing) have similar structure. Biggest problem with land evolution: lack of water. Change in gases surrounding the plant - respiration would have to change. Less support needed in water than on land. Need some way to transport nutrients against gravity.

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