Presentation on theme: "This longitudinal section view does not allow us to consider symmetry"— Presentation transcript:
1 This longitudinal section view does not allow us to consider symmetry Basic Flower StructurestigmacarpelPistil is simplegynoeciumloculeFlower is perfectFlower is monoeciousstylepollenovuleovaryanthersuperiorfilamentstamenFlower is hypogynousandroeciumpetalcorollasepalperianthreceptaclecalyxPerianth is completepedicelThis longitudinal section view does not allow us to consider symmetry
2 Flower Functions Leading to Sex pollinationvectors: animals, windpollen tube growthpollen dehiscencechemotropismsyngamyxWhat are the rest of the flower parts doing?
3 Anther Cross Section - How many anther sacs are present? epidermisveinmesophyllpollen grains
4 Pollen grain Tube Cell Generative Cell Pollen Wall cytoplasm cytoplasm nucleusnucleusnucleolusnucleolusDigests path through stigma, style, and ovary.Locates micropyle of ovule.Penetrates into embryo sac.Divides by mitosis to make two sperm.Both join in syngamy events.Pollen WallWaterproofing prevents desiccation during pollen transfer. Recognition proteins cause allergic reactions.
5 Pollen Grain Pollen Wall Fate: Digests Path to Egg Locates Micropyle TubeCellGenerative CellCytoplasmCytoplasmNucleusNucleusNucleolusNucleolusFate:Digests Path to EggLocates MicropyleEnters Embryo SacIs Burst to Release SpermFate:Follows Path of TubeDivides by MitosisMakes Two SpermBoth Have Syngamy
6 Pollen grain deposited by vector on stigma Tube cell germinates through pollen wallPollen tube digests pathway to eggAttracted to source of hormones, Calcium, BoronChemotropism toward micropyle of ovulePenetrates into embryo sacgenerative nucleuspollen tubeGenerative cell follows pathway of pollen tube.Generative cell divides to make two sperm cells.tube nucleustube nucleusGolgiandvesiclesSynergids burst end of pollen tube.Sperm released into embryo sac.Syngamy events follow.
7 Rhododendron maximum ovule ls Integument3 Antipodal CellsEmbryo SacdisintegrateCentral Cell+ sperm = endospermEgg Cell+ sperm = zygote2 Synergid Cellsburst pollen tuberelease spermdisintegrateMicropyle of Integument
8 Embryo Sac in Ovule Embryo Sac Ovule Integument Antipodals Funiculus Central CellMicropyleEggSynergids