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HORT 100 Week 2 Notes

by: Erin Wade

HORT 100 Week 2 Notes HORT 100-001

Erin Wade
GPA 3.9

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About this Document

Lecture notes for week 2 Prof Hughes Plant anatomy
Horticultural Science
Hughes, Harrison G
Class Notes
HORT100, horticulture, plants, hughes
25 ?




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This 6 page Class Notes was uploaded by Erin Wade on Friday September 2, 2016. The Class Notes belongs to HORT 100-001 at Colorado State University taught by Hughes, Harrison G in Fall 2016. Since its upload, it has received 37 views. For similar materials see Horticultural Science in Agriculture / Horticulture at Colorado State University.


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Date Created: 09/02/16
8/29/16  Cellular Structure  ­ The cell is the basic structure of the organism  ­ Cytology ­ the study of cells  ­ Types  ● Prokaryote ­ No separate subcellular units  ● Eukaryote ­ Compartmentalization bounded by membranes  ­ Cytoplasm ­ liquid that all the stuff is floating around in    Plant Tissue  ­ Meristematic ­ Cells are capable of cell division  ● Apical Meristems  ○ Shoot  ○ Root  ○ Ex: grass keeps growing even though we cut off the tops  ● Subapical Meristems  ● Intercalary Meristems  ● Lateral Meristems  ○ Vascular Cambium  ○ Cork Cambium  ­ Permanent ­ Mature cells are incapable of cell division  ● Simple ­ tissue composed of single type of cells  ○ Parenchyma  ○ Collenchyma (the strings in celery)  ○ Sclerenchyma (rough cells just under the skin of pears)  ● Complex ­ tissue composed of more than one type of cells  ○ Xylem  ■ Xylem vessels  ■ Tracheids ­ individual cells that elongate and taper  ○ Phloem  ■ Sieve tubes  ■ Companion cells  Meristematic Tissue ­ actively dividing cells  ●     Permanent Tissues  ­ Simple  ● Epidermal  ○ Out cell wall is thicker to hold on to water  ● Parenchyma  ● Sclerenchyma  ○ Dead cells, highthy thickened walls  ● Collenchyma  ● Cork    8/31/16  Plant Organs  ­ Leaves  ● Leaf blade (flat part involved in photosynthesis)  ○ Margin  ○ Tip   ● Petiole (stem)  ● Stipule (leafy/grassy things on stem)  ● Stomates ­ minute opening in the epidermis through which gas exchange occurs,  location varies from plant to plant    9/2/16  Root Morphology  ­ Fibrous Root System  Ex: grass  ­ Tap Root System  Ex: carrot  ­ Regions of Root:  ● Area of cell maturation  ● Area of cell elongation ­ sprout root hair to increase surface area of roots to  absorb more water  ○ If you root something in water, they do not sprout root hairs  ● Apical Meristem  ● Root Cap  Young Root          More Mature Root      Flowers  ­ Specialized floral leaves modified for sexual reproduction (both male and female)  ­ Used extensively in the identification of plant species relative to the position of the ovary  and how the floral parts are held  ­ A flower is complete if all four kinds of floral organs are present (sepals, petals, stamens,  pistil)    Complete Flower  1. Sepal  ­ Calyx  2. Petal  ­ Corolla  3. Stamen  ­ Filament    ­ Anther Sac  4. Pistil  ­ Stigma  ­ Style  ­ Ovary      Perfect vs. Complete  ­ Perfect flowers ­ has stamens and pistils  ­ Imperfect flowers ­ if either stamens or pistils are missing  ● Staminate ­ If stamens are present and pistils absent  ● Pistillate ­ If pistils are present and stamens absent  ● Monoecious ­ Both Staminate and Pistillate flowers occur on same plant  ○ Ex: corn  ● Dioecious ­ Staminate and Pistillate flowers occur on different plants  ○ Ex: asparagus  ­ A flower can be perfect but still be incomplete if it has everything that is necessary          ­ Microspore  ­ Pollen  ● Generative Nucleus  ● Sperm Nuclei  ● Pollen Tube Nucleus  ● Megaspore  ­ Ovule ­ embryo sac  ● Megaspore  ● Egg Nucleus  ● Antipodals  ● Synergids  ● Polar  ­ Nucellus Tissues       


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