Plant Structures and Growth BIOL 1407 Root System

Plant Structures and Growth BIOL 1407

Root System • Environment: Soil • Functions: – Anchorage – Absorbs water and minerals – Transport • Photo Credit: Rasbak van Teun. Spaans, Wikimedia Commons

Root Hairs • Close to tip of root • Extensions of epidermal cells • ↑ surface area • ↑ absorption

Shoot System • Environment: Atmosphere • Functions: – – • Photosynthesis Transport Support Reproduction Photo Credit: Doyle Cross, El Yunque Cloud Forest, Puerto Rico 2007

Shoot System • Organs: – Stems – Leaves – Flowers • Photo Credit: Joseph Amana, Biology Student, Lady Bird Johnson Wildflower Center 2005

Growth • Indeterminate growth Grow throughout life • Primary growth • Secondary growth

Meristems • Growth Zones • Apical Meristems – At tips of roots & shoots – Primary Growth

Meristems • Lateral Meristems – Only in woody plants – Cylinder in mature roots and stems – Secondary Growth • Wood • Bark

Root Tip

Dicot Root X-Sec

Stele of Dicot Root

Shoot Tip

Dicot Stem X-Sec

Dicot Leaf X-Sec

Lower Epidermis of Leaf

Vascular Tissue • Xylem – Water – Minerals • Phloem – Organic compounds

Xylem

Phloem

Plant Videos • http: //www. youtube. com/watch? v=a. Nj. R 4 r VA 8 to&feature=related • Carnivorous Plants: • • http: //www. youtube. com/watch? v=Lo. LJSMOs. PCg http: //www. youtube. com/watch? v=kt. IGVt. Kdgwo&feature=related http: //www. youtube. com/watch? v=tr. Wz. Dl. Rvv 1 M&feature=related

The End Unless otherwise specified, all images in this presentation came from: Campbell, et al. 2008. Biology, 8 th ed. Pearson Benjamin Cummings.