Botany Basics. Botany is...

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1 Botany Basics John Punches Oregon State University Botany is... The study of plants. 1

2 Plants in our Ecosystem Capture sun s energy Food source Replenish atmospheric oxygen Participate in water cycle Moderate world climate Provide shelter Source of numerous raw materials Botany Applied Identify plants Grow & propagate plants Influence flowering & fruit production Control unwanted growth Maintain plant health Modify plant features 2

3 Reading Assignment Reading Option extension.oregonstate.edu/mg/botany 3

4 Basic Classifications Vascular vs. Non-vascular Seed vs. Seedless Flowering vs. Flowerless Big 2 Vascular Plant Divisions Flowering Plants (Anthophyta) Cone Bearing Plants (Coniferophyta) Plant Life Cycles Annuals - complete life cycle (seed to seed) in one year Biennials - require all or part of 2 years to complete life cycle Perennials - live longer than 2 years Herbaceous - soft stems that die back in winter Woody - trees, shrubs, etc. 4

5 Monocots vs Dicots Structure Monocots Dicots Seed Leaves Vascular System One Xylem & phloem in bundles, dispersed in stem Two Xylem & phloem in rings; xylem inner ring, phloem outer ring Floral Parts Usually threes or multiples of three Usually in multiples of four or five Leaves Often parallel-veined Generally net-veined Vascular Plant Structure Roots Stems Leaves Flowers Fruit & Seeds 5

6 Roots Root Functions Absorb nutrients Absorb moisture Anchor plant in soil Support stem Store food Propagate vegetatively 6

7 Root Structure Lateral Root Primary Root Zone of Maturation Root Hairs Root Tip Root Cap Zone of Elongation Meristematic Zone Zone of Elongation Meristematic Zone Root Tip Root Cap Photo: Source Unknown 7

8 Tap Root Fibrous Root Root Anatomy Epidermis Cortex Endodermis Xylem Phloem Photo: Botany for Gardeners, Capon 8

9 Root Tissues Xylem - conduct water & nutrients Phloem - carry sugars & starches Endodermis - contain vascular tissues Cortex - primary tissue surrounding vascular bundle Epidermis - outermost layer of plant tissues, protective layer Stems 9

10 Stem Functions Support buds Support leaves Support flowering/fruiting structures Carry water & minerals Carry food (photosynthates) Terminal Bud Node Node Internode Axillary or Lateral Bud Node Bud Scale Scar Lenticel (breathing pore) Leaf Scar 10

11 Inside a Bud Apical Meristem Axillary Bud Node Internode Node Photo: Botany for Gardeners, Capon Stem Structure Quiz Photos: Botany for Gardeners, Capon 11

12 Herbaceous Stem Anatomy Xylem Phloem Vascular Bundles Illustration: Botany for Gardeners, Capon Vascular Arrangements in Stems Herbaceous Monocot Herbaceous Dicot 12

13 Monocot Vascular Arrangement Air Space Xylem Phloem Support Cells Dicot Vascular Arrangement Support Cells Phloem Vascular Cambium Xylem 13

14 Stem Tissues Herbaceous Monocot Herbaceous Dicot Vascular Bundle Epidermis Cortex Ground Tissue Vascular Cambium Pith Woody Stem Growth 14

15 Woody Stem, Secondary Growth Woody Stem Anatomy Heartwood - nonfunctional xylem Outer Bark Sapwood - functional xylem Inner Bark (phloem) Vascular Cambium 15

16 Woody Stem Anatomy Adapted from Panshin & DeZeeuw, 1980, Textbook of Wood Technology, 4th edition, p17. Stem Tissues Xylem - conduct water & minerals Phloem - carry sugars & starches Epidermis - Outermost layer of plant tissue, protective layer Cortex - primary tissue surrounding vascular bundles Pith - thin-walled cells at center of stem 16

17 Specialized Above-Ground Stems Crowns - compressed stems with leaves and flowers on short internodes Spurs - short side stems arising from main stem, often bear fruit on trees Stolons - fleshy or semiwoody, elongated, horizontal stems, often at soil surface Specialized Underground Stems Tuber - enlarged, short, fleshy underground stem tip Rhizome - horizontal underground stem, may be compressed and fleshy or slender with elongated internodes Bulb - short, compressed, underground stem with central bud at tip of stem, surrounded by fleshy scales (leaves) 17

18 Specialized Underground Stems Corm - solid, swollen underground stem with dry, scale-like leaves Tuberous stem - short, flat, enlarged underground stem with buds and shoots at top and fibrous roots at bottom 18

19 19

20 20

21 Leaves Leaf Functions Photosynthesis - use sunlight to make food Respiration - use food to make energy Transpiration - lose water (as vapor) to atmosphere 21

22 Leaf Parts Lamina (blade) Petiole Leaf Anatomy Guard Cells Stoma Cuticle Upper Epidermis Palisade Mesophyll Vascular Bundle Spongy Mesophyll Intercellular Chamber Lower epidermis Cuticle 22

23 Leaf Model upper epidermis palisade mesophyll spongy mesophyll lower epidermis vascular bundle xylem phloem stoma Stoma & Guard Cell Stoma Guard Cell 23

24 Stomatal Control Open Closed Leaf Surface 24

25 Leaf Forms Types of Leaves Scale leaves (cataphylls) - enclose and protect rhizomes and buds Seed leaves (cotyledons) - store food for seedlings Spines & Tendrils - protect or help support Storage leaves - found on bulbous plants & succulents, store food Bracts - modified, often brightly-colored leaves around flowers 25

26 Flowers 26

27 Flower Functions Exchange pollen Achieve fertilization Produce seed Flower Anatomy Stamen Filament Anther Stigma Petal Style Pistil Sepal Ovary 27

28 Filament Style Anther Stigma Petals Sepals Photo: Botany for Gardeners, Capon 28

29 Flower Types Complete all floral organs present (sepals, petals, stamens, pistil) Incomplete flower lacks 1 or more of the 4 organs Flower Types Perfect - has both stamen (male organs) and pistil (female organ) Imperfect - having only one type of organ Staminate - male organ present Pistillate - female organ present 29

30 Imperfect Flowers Staminate Pistillate Photos: Botany for Gardeners, Capon Imperfect Flowers Pistillate Flower Staminate Flower 30

31 Species with Imperfect Flowers Monoecious both pistillate and staminate flowers occur on same plant birch, pecan, squash Dioecious pistillate are on one plant, staminate on a different plant ginkgo, holly, pistachio, kiwi Pollination Exchange of pollen Numerous mechanisms insects, birds, bats, wind, rain Flowers are optimized for their pollination vector 31

32 Fertilization Pollen Grain Pollen Tube Stigma Style Ovary Ovule After: Botany for Gardeners, Capon 32

33 Fruit Petal Stigma Stamens Style Sepals Ovary Sepal Floral Tube Ovule (becomes seed) Types of Fruit Simple - develop from one ovary (may have multiple seeds) Aggregate - develop from a single flower with multiple ovaries Multiple - develop from a tight cluster of separate flowers 33

34 Seeds Seed Anatomy Embryo - miniature plant in an arrested state of development Endosperm - food supply (can be comprised of proteins, carbohydrates, fats) Seed coat - hard outer covering that protects from disease and insects; also repels water 34

35 Germination Activation of embryo within seed Preceded by water penetrating seed coat Oxygen, favorable temperature, and (in some species) light required Germination of a Dicot 35

36 Germination of a Monocot The Incredible Vascular Plant 36

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