UT Arlington BIOL BIOL 3427 - Evolution of the Angiosperms (4 pages)

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Evolution of the Angiosperms



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Evolution of the Angiosperms

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This lecture note outlines the evolution of Angiosperms and various flower types.


Lecture number:
1
Pages:
4
Type:
Lecture Note
School:
University of Texas at Arlington
Course:
Biol Biol 3427 - Plant Science
Edition:
1

Unformatted text preview:

BIOl 3427 1st Edition Lecture 1 Outline of Current Lecture II Relationships of the angiosperms III Origin and diversification of the Angiosperms IV Evolution of the flower V Evolution of the fruits VI Biochemical Evolution Evolution of the Angiosperms I In fossil record early in Cretaceous at least 130 million years ago i Ancestral to the gymnosperms ii Dominated global vegetation by 90 million years ago iii Modern families and genera by 75 million years ago II Origin and diversification of Angiosperms a Flowers b Closed carpels c Double fertilization Endosperm formation d 3 nucleate micro gametophyte e 8 nucleate micro gametophyte f Stemens 2 pairs of pollen sacs g Phloem Sieve tubes and companion cells VII Derived from single common ancestor a Seed plant b Lacked flowers closed carpels and fruits c Pollen with single aperture d 3 of angiosperms are not monocots or eudicots e Magnoliids i Magnolias laureli pepper pipeune spicebush ii Leaves contain oil cells gives rise to spices iii Air pockets in stem helps them stay up f Diacious i 2 plants ii Sexes are separate iii A female is on one plant and a male is on the other VIII First Angiosperm fossil a Archaefructus These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute b 125 million years ago c Seeds enclosed in carpels fruits d Stood in shallow water e No sepals or pedals IX Evolution a Perianth i Did not have distinct sepals or pedals ii Pedals a Modified leaves sepals specialized for attracting pollinators b Pedal fusion to form tube c Stamens and sepals fuse too iii Stamens a Diverse b Woody magnolias broad colorful and scented c Other flowers fleshy d Flowers today Filamentous stamens a Used to be thick and broad e Fuse together f Lost fertile function iv Nectaries a Gland that secretes nectar b Gives food to the pollinator X Carpels of Early Angiosperms a No specialized stigma b Not fused c More ovules than



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