Designed by Pyeongsug Kim ©2009 SI Session SI Session Spring 2010 Angiosperms (Flowers) Structure and Reproductive system Part1 Topic 18 Dr. Hughey’s Bio 3 (Lab.)

Designed by Pyeongsug Kim, ©2009 Phylum _____________Anthophyta -Flowering plant -(Naked/Covered) Seeds -Fruits -Monocot & ________ flower What is “flower”? -The (sexual/non-sexual) reproductive structure in the plant (Anthophyta) Eudicot

Designed by Pyeongsug Kim, ©2009 -The sexual reproductive structureFlowers A: B: C: D: E: F: G: H: I: Petal Anther Filament Stigma Style Ovary Ovule Receptacle Sepal D + E + F = B + C = Carpel(Pistill) Stamen

Designed by Pyeongsug Kim, ©2009 may or may not Sepals may or may not be different from petals in color or shape. Sepals (calyx) Petals (Collora) Sepals (calyx) Petals (Collora) Collectively, petals form __________. Collectively, sepals form __________. Collora Calyx

Capels (Pistill) vs. Stamen Designed by Pyeongsug Kim, ©2009 A carpel consists of ___________________. Stigma, style, & ovary A stamen consists of ___________________. Anther & filament Anther Filament How many of stamen are seen? 6 stamens Stigma Style Ovary How many of carpel(pstill) are seen? 1 Carpel (Pstill)

How many of stamen are seen? How many of carpel(pstill) are seen? Designed by Pyeongsug Kim, ©2009 Front view Side view 6 Carpel (Pstill) Lots of stamens (Purple hair-like)

Designed by Pyeongsug Kim, ©2009 The same model as we saw in MER 6.

From Dr.Hughey’s Bio3 Slide

Designed by Pyeongsug Kim, ©2009 -Four pollen sacs Anther(Cross section) A B A: B: Pollen sac (microsporangia) Filament Cross section __ microsporangia in each anther 4

 Immature anther Designed by Pyeongsug Kim, ©2009 Microspore mother cells (2n) (Microsporocytes)  Mature anther Pollen grains -Pollen result from _________________.mitosis of microspore

Designed by Pyeongsug Kim, ©2009 Development of pollen 1) 2) 3) Microspore mother cells (2n) (Microsporocytes) Pollen Tetrads of Microspore(n) (Mitosis/Meiosis) How many of nuclei are in each microspore? A microspore has only one. How many of nuclei are in each pollen? 2 or 3 nuclei result from mitosis.

Designed by Pyeongsug Kim, ©2010 Picture from

Designed by Pyeongsug Kim, ©2009 Carpel (pistill)

Designed by Pyeongsug Kim, ©2009 Carpel (pistill) A B C A: B: C: D: Stigma Style Ovary Ovule D Ovules develop into ______.Seed

Mature Embryo Sac- 8 nuclei, 7 celled structure From Dr.Hughey’s Bio3 Slide

Embryo Sac Designed by Pyeongsug Kim, ©2009 -Female gametophyte contained within a _________.megaspore

Designed by Pyeongsug Kim, ©2009Pollination -The transfer of pollen from a stamen to a pistil

Designed by Pyeongsug Kim, ©2009 Germinating pollen after Pollination Pollen grain What is the botanical name? Microgametophyte(n) (Mature male gametophyte(n)) What happens inside? Form two sperms and pollen tube. Germinating Pollen

Fertilization after pollination How are the sperms convey to the embryo sac? By pollen tube What is “double fertilization?” -the union of one sperm(n) with egg(n) :__________  Becomes ___________ -the other sperm with _____________ : ___________  Becomes ____________________________ Designed by Pyeongsug Kim, ©2009 Zygote(n) fertilization Two polar nucleiTriple fusion Primary endosprem nucleus(3n)

Designed by Pyeongsug Kim, ©2009 After double fertilization The zygote(2n) develops into __________. an embryo The primary endosperm nucleus(3n) develops into __________.endosperm

Designed by Pyeongsug Kim, ©2009Summary -from pollination and fertilization to development of embryo