(Photo Atlas: Figures 9.147, 9.148, 9.150, 9.1, 9.2, )
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1 BIOL 221 Concepts of Botany Fall 2007 Topic 07: Primary Plant Body: The Root System (Photo Atlas: Figures 9.147, 9.148, 9.150, 9.1, 9.2, ) A. Introduction The root has the primary functions of ABSORPTION of water plus minerals, ANCHORAGE to the soil / substrate, CONDUCTION, and STORAGE of food. The cells and tissues examined in our previous lab are all present in the root tissue and contribute to its function. In addition, the three tissue systems found in stems and leaves are each continuous with those of the root, yet the arrangement of these tissue systems appears very different in each of the three organs. The overall form and appearance of roots is also quite distinct from that of stems and leaves, and this difference is undoubtedly a reflection of the different functions of roots. Fig. 1. Examples of various root systems and the depth of growth exhibited by each. Concepts of Botany, (page 1 of 9)
2 B. Root Morphology The PRIMARY ROOT, the sporophyte s first root, develops from the ROOT APICAL MERISTEM. In gymnosperms and dicotyledons, the primary root usually develops as a TAPROOT, which gives rise to LATERAL ROOTS (i.e., branch roots). These in turn branch, giving rise collectively to a TAPROOT SYSTEM. In monocots, the primary root is commonly short-lived or not dominant. Actually, the root system of the adult plant is largely ADVENTITIOUS (i.e., arising from the stem!). These ADVENTITOUS ROOTS give rise to a more or less homogeneous system called a FIBROUS ROOT SYSTEM. Fig. 2. Illustration depicting a typical root with cross sections at various points along the root. The primary tissues are labeled as they arise in a radial fashion. The lower right image shows the occurrence of mitotic activity. As you work through the following exercises, try to be constantly relating what you see to the function of roots in anchorage, absorption, and storage. B1. Compare and contrast the examples of a typical Grass and a Brassica (mustard) root system. Which has the fibrous root system and which has the taproot? Can you identify the primary root in the fibrous root system? What advantages would you expect from each of these types of root systems? Concepts of Botany, (page 2 of 9)
3 B2. Working in pairs, obtain a germinated Radish (Raphanus) seedling and examine it. Use a dissecting scope for close observations at the tip. Draw the root and label the root hairs and the root cap. What is the function of the root hairs? Do the root hairs extend to the tip? Why? Can you discern the root cap? B3. Using an undamaged radish seedling, cut the primary root in half longitudinally (i.e., a median longitudinal section), coat it with Toluidine Blue for 30 seconds, rinse it with water and mount in on a microscope slide. Observe with the compound light microscope. Can you identify the files of cells in the root? What primary tissue system gives rise to the root hairs? Draw and label the tissues and meristematic regions: Concepts of Botany, (page 3 of 9)
4 C. Root Anatomy: Primary Tissues and Cells. The figure below depicts the radial patterning associated with a typical DICOT ROOT. Use this picture to help orient you when observing the root cross section specimens. Fig 3. Typical dicot root cross-section. What two types of vascular tissue are included in the vascular system? C1. Now, inspect the vascular cylinder carefully in more detail (Fig. 4). Find the following structures and label the figure below accurately. (1) PRIMARY XYLEM, (2) PRIMARY PHLOEM, (3) CAMBIUM = region between the primary xylem and primary phloem that remains meristematic, (4) ENDODERMIS = suberized (SUBERIN is a water-repellant substance), thick-walled cells; innermost layer of the cortex, (5) PERICYCLE = thin-walled undifferentiatedcell layer just inside the endodermis; this is the outermost layer of the vascular cylinder. (6) PASSAGE CELLS = cells of the endodermis opposite the protoxylem poles, which are not thick-walled or heavily suberized. Fig. 4. Ranunculus (buttercup); transverse-section. Highmag view of inner cortex and the vascular cylinder. On the picture, add in an arrow and a label to indicate the CASPARIAN STRIP. Endodermal cells (including the passage cells) have Casparian strips in their transverse and radial walls. Being made of suberin, Casparian strips are impermeable to water. Concepts of Botany, (page 4 of 9)
5 C2. Observe the prepared Ranunculus (buttercup) root cross-section (c.s.) slide. Use the figures above to orient yourself when observing the tissues. This slide depicts a typical DICOT (eudicot) primary root. Pay close attention to the organization of the primary tissues. Draw your observations from the Ranunculus (buttercup) root cross-section (c.s.) slide and label the same structures and regions as above on your drawing. What organelles are in the cortex? Indicate the PROTOXYLEM and the METAXYLEM. What tissue is the PERICYLE made of? C3. Observe the prepared Smilax (catbrier; greenbrier) root cross-section (c.s.) slide. This is an example of a MONOCOT root cross section. Based on your knowledge of the dicot root anatomy, locate the same structures and regions. Draw your observations from the Smilax root and label the structures and regions. Include any regions that are not part of the dicot root anatomy. How is the monocot different? Are there any additional tissues present? If so, which tissue system does it belong to? C4. Now test your knowledge! Use the prepared slide with cross sections of both a typical dicot and typical monocot present. Identify them as monocot or dicot and DRAW a sketch of the RADIAL organization of each to support your claim. Concepts of Botany, (page 5 of 9)
6 D. The Root Tip & The Root Apical Meristem D1. Obtain a prepared slide of an onion (Allium) root tip. This slide is a longitudinal section (labeled as l.s.). Examine the cells along the root tip from the natural terminal end (rounded) to the cut end. The PROMERISTEM is at the tip behind the root cap and consists of small densely packed cells. Cell division continues in the APICAL MERISTEMATIC tissue behind the promeristem. Both make up the ROOT APICAL MERISTEM. Notice the files of cells. Can you trace the lineage of a cell from the middle of the root tip to a meristematic cell? How does the meristem contribute to the growth of the plant? Can you detect mitotic activity in any of the cells? Where do you see the most amount of mitotic activity? D2. Using the Onion (Allium) root tip longitudinal section (l.s.) slide, draw what you see next to the figure of an onion root tip. Label both your drawing and the figure with the following regions: (1) ROOT APICAL MERISTEM, (2) PROTODERM (young epidermis), (3) GROUND MERISTEMATIC TISSUE (young cortex), the (4) PROCAMBIUM (young vascular cylinder), and the (5) ROOT CAP. Place your onion root tip drawing here. Draw entire length of a single root in your slide. Concepts of Botany, (page 6 of 9)
7 E. Root Growth and Maturation E1. Continue using the Onion (Allium) root tip longitudinal section (l.s.) slide and on your drawing above, label the Regions of CELL DIVISION, CELL ELONGATION, and MATURATION. Then complete this table to the best of your ability: Zone/Region 3. Region of maturation 2. Region of cell elongation 1. Region of cell division relative cell length (short, intermediate, long) frequency of mitotic cells (low, medium, high) presence of mature xylem or phloem cells? (yes/no) presence of root hairs? (yes/no) E2. Go back to your observations of the Radish seedling and label the drawing with the maturation, elongation, cell division, root apical meristem regions/zones. F. Origin of Lateral Roots Branches on stems arise EXOGENOUSLY (from axillary buds). Root branches (lateral roots) are said to arise ENDOGENOUSLY. Closely examine the prepared slide of the Salix branch root origin and DRAW your observations below. Label the tissues within the primary root cross section and the tissue regions of the lateral root. Based on your observations, what does endogenous mean? What cell layer generates the lateral root? Does the vascular tissue appear to be continuous from the primary root to the lateral root? Compare the young branch root to the previously Examined primary root. Are there any differences? What tissues are penetrated by the lateral root? Concepts of Botany, (page 7 of 9)
8 Concepts of Botany, (page 8 of 9)
9 G. Adventitious Roots G1. Observe the Vanilla planifolia (vanilla orchid) or Philodendron specimen provided. Examine the adventitious roots. Do they arise from the internodes or nodes? These plants typically grow as a climbing vine. How do adventitious roots facilitate this type of growth form? G2. (Optional) Make your own adventitious roots using a Setcreasea (purple heart) plant which is a member of the spiderwort family Take a stem cutting that has at least three sets of leaves along the stem. Place the cutting in the tray containing moist vermiculite or peat so that the end that you cut is covered. Label the cutting with your name and the date. We will keep them watered during the next week. Next week, dig them and take them home to establish your own plant. For Consideration: Would it make any difference which end of the cutting was inserted into the soil? What part of the stem will the adventitious roots arise from? What tissue is most likely responsible for the regeneration of roots? Concepts of Botany, (page 9 of 9)
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