Lecture 10: Flower Morphology
Lecture 10: Flower Morphology HORT 1001
U of M
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This 0 page Class Notes was uploaded by Abbie on Wednesday November 4, 2015. The Class Notes belongs to HORT 1001 at University of Minnesota taught by Thomas Michaels in Fall 2015. Since its upload, it has received 31 views. For similar materials see Plant Propagation in Agriculture and Forestry at University of Minnesota.
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Date Created: 11/04/15
General Introduction to Flower Parts 0 Angiosperm compressed stem with four nodes and 3 internodes Typlinai l imgglezaip narm EliHr UJ mNOWU39lh 9 Peduncle contains vascular tissue for the transport of various substances to and from the ower Receptacle region of tissue that gives rise to four whorls or spirals of modi ed leaves Sepals leaflike appendages and lack sporangia form the calyx and comprise lst ring of oral parts Petals lack sporangia and produce spores modi ed leaves Stamens bear sporangia and produce spores modi ed leaves Anther divided into two lobes with each lobe having two microsporangia Filament Carpel modi ed leaf containing internal protected megasporangia form the fourth whorl of ower appendages and vary in number Stigma specialized for catching pollen and promoting germination of pollen of plants of the same species 10 Style length varies elevates stigma and serves as pollen tube conduit 11 Ovary swollen region forming the base of the carpel contains cavities called locules with one or more ovules locules are remnants of the interior of the folded ancestral leaf and the ovules contain the megasporangia ovules are attached to the ovary wall by the funiculus 12 Ovule in the center megaspore mother cell surrounded by the megasporangium which is surrounded by integuments which eventually grow together and leave only a micropyle behind Calyx o lst node base of receptacle 0 Sepals attached here 0 When sepals looked like petals they are called tepals Corolla 0 Second node 0 Composed of highly modi ed leaves called petals which attract pollinators through their bright colors and showy patterns 0 May include a landing strip which gives insects a visual guide that points to the nectar o Calyx Corolla Perianth Androecium o Composed of modi ed leaves called stamens Filament lifts anther to position where it can effectively release pollen grains has a plumbing function that it connects the anther to plant39s vascular system for water and nturients Gynoecium o Composed of carpels multipepisti o Carpels consist of three parts Stigma tip on end of structure Stalk called the style Ovary Inside is chamber called locule which has one or more ovules Ovules have embryo sac megasporangia and megaspore mother cells Meiosis of mother cells leads to female gametes eggs 0 Epigynous have other ower part attached ABOVE the ovary Called an inferior ovary ovary is surrounded by other tissues primarily receptacle 0 Perigynous have an ovary that is surrounded by fused bases of ower parts that surrounds the ovary o Hypogynous other ower parts attached BELOW the ovary Called superior ovary sits above point of attachment of the top whorl o A ower with a calyx corolla androecium gynoecium is quotcompletequot Pollination Patterns 0 Flower with androecium and gynoecium is called perfectbisexualhermaphroditemonoecious Capable of selfpollination o Cleistogamy anther matures and pollen is shed and the stigma is receptive BEFORE the ower even opens Protandry pollen is shed before stigma is receptive Protogyny stigma is receptive prior to pollen shed Some plants avoid selfpollination Staminate owers containing only androecium which diverts all stored energy to their rhizomes and don39t have fruits o Pistillate owers containing only gynoecium which diverts some stored energy 0 Dioecious singlesex plant See Summary of Terms 0000
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