BILD2_Lect_3_13_12

BILD2_Lect_3_13_12 - 3/13/2012 Video Recording is in...

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3/13/2012 1 Video Recording is in progress today as part of teaching evaluation Students who do not wish to be filmed may sit in the left side of the classroom Dr. Cawas Engineer 3-13-2012 I. Plant Transport Whole plant Transport Xylem and Phloem Theories for bulk flow II. Plant Nutrition Essential nutrients Nutrient deficiency Symbiosis and Nitrogen Fixation Office Hours: Wednesday 3-14-2012, 11A.M. to Noon And Friday 3-16-2012 , 11A.M. to Noon 5th floor of MUIR Biology, Room: 5125A
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3/13/2012 2 Clicker Question 1: A plant developed a mineral deficiency after being treated with a fungicide. What is the most probable cause of the deficiency? A) Mineral receptor proteins in the plant membrane were not functioning. B) Mycorrhizal fungi were killed. C) Active transport of minerals was inhibited. D) The genes for the synthesis of transport proteins were destroyed. E) Proton pumps reversed the membrane potential. Figure 35.2 PLANT TRANSPORT FUNCTIONS - nutrient uptake from soil - water transport - metabolite transport (sugar, starch, organic compounds) LEVELS OF TRANSPORT A. Uptake of minerals & water by a cell B. Transport from cell to cell C. Whole plant transport: (xylem, phloem)
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3/13/2012 3 Short Distance Transport and Transport at the whole plant level Short Distance Transport Types of Short Distance Transport Water uptake: osmotic flow Passive transport for ions: Channel proteins Active transport against electrical and chemical gradient : Carrier or pump PLANT TRANSPORT Transport at the whole plant level
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3/13/2012 4 Clicker Question 2: In vascular plants, how is the sucrose-rich phloem sap transported? A. From the roots to the leaves B. From the leaves to the roots C. From sucrose source to sucrose sink D. Only diffuses locally E. From the stomata • Xylem and phloem in land plants facilitate the long-distance transport of water, minerals, and the products of photosynthesis • Xylem transports water and minerals from roots to shoots: tracheids and vessel elements; dead • Phloem transports photosynthetic products from sources to sinks: sieve-tube elements and companion cells; alive PLANT TRANSPORT Figure 36.2-1 H 2 O and minerals H 2 O Figure 36.2-2 H 2 O and minerals O 2 CO 2 CO 2 O 2 H 2 O
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3/13/2012 5 Figure 36.2-3 H 2 O and minerals O 2 CO 2 CO 2 O 2 H 2 O Light Sugar Whole plant transport processes PLANT TRANSPORT I. Xylem Transport II. Phloem Transport Figure 30.5 How does water from the roots of a Giant Sequoia reach its leaves?
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3/13/2012 6 Figure 36.2-1 H 2 O and minerals H 2 O I. Xylem Transport Figure 36.10a Plasma membrane Casparian strip Apoplastic route Symplastic route Root hair Epidermis Endodermis Vessels (xylem) Vascular cylinder (stele) Cortex I. XYLEM TRANSPORT 1) Apoplastic (cell wall) Pathway 2) Symplastic (cytoplasm) Pathway - Cell to cell diffusion via plasmodesmata Apoplast and Symplast Apoplast consists of everything external to the plasma membrane and includes cell walls and extracellular spaces Symplast consists of the entire mass of cytosol of all the living cells in a plant, as well as the plasmodesmata.
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3/13/2012 7
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BILD2_Lect_3_13_12 - 3/13/2012 Video Recording is in...

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