Transcript Document
Basic Flower Structure stigma Pistil is simple locule carpel gynoecium style ovule pollen ovary superior Flower is perfect Flower is monoecious anther filament Flower is hypogynous stamen androecium petal corolla receptacle pedicel sepal calyx perianth Perianth is complete This longitudinal section view does not allow us to consider symmetry Flower Functions Leading to Sex pollination vectors: animals, wind pollen tube growth pollen dehiscence x syngamy chemotropism What are the rest of the flower parts doing? Anther Cross Section - How many anther sacs are present? epidermis vein mesophyll pollen grains Pollen grain Tube Cell cytoplasm nucleus nucleolus Digests path through stigma, style, and ovary. Locates micropyle of ovule. Pollen Wall Penetrates Waterproofing prevents desiccation during into embryo pollen transfer. Recognition proteins cause sac. allergic reactions. Generative Cell cytoplasm nucleus nucleolus Divides by mitosis to make two sperm. Both join in syngamy events. Pollen Grain Pollen Wall Tube Cell Generative Cell Cytoplasm Cytoplasm Nucleus Nucleus Nucleolus Nucleolus Fate: Digests Path to Egg Locates Micropyle Enters Embryo Sac Is Burst to Release Sperm Fate: Follows Path of Tube Divides by Mitosis Makes Two Sperm Both Have Syngamy Pollen grain deposited by vector on stigma Tube cell germinates through pollen wall generative nucleus pollen tube tube nucleus Pollen tube digests pathway to egg Attracted to source of hormones, Calcium, Boron Chemotropism toward micropyle of ovule Penetrates into embryo sac Generative cell follows pathway of pollen tube. Generative cell divides to make two sperm cells. tube nucleus Golgi and vesicles Synergids burst end of pollen tube. Sperm released into embryo sac. Syngamy events follow. Rhododendron maximum ovule ls Integument 3 Antipodal Cells disintegrate Central Cell + sperm = endosperm Egg Cell + sperm = zygote 2 Synergid Cells burst pollen tube release sperm disintegrate Micropyle of Integument Embryo Sac Embryo Sac in Ovule Ovule Embryo Sac Integument Antipodals Funiculus Micropyle Central Cell Egg Synergids Plant Pornography? Disintegrating Antipodals Central Cell Polar Nuclei Sperm Nucleus Syngamy Product = Endosperm 3N Egg Cell Sperm Nucleus Egg Nucleus Syngamy Product = Zygote 2N Disintegrating Synergids After Syngamy, the Names are Changed… • Egg becomes Zygote • Central cell becomes Endosperm • Ovule becomes Seed • Integument becomes Seed coat • Ovary wall becomes Fruit Capsella shepherd’s purse seed Integument became seed coat Egg became zygote Zygote became embryo Central Cell became endosperm Ovary became fruit