transport in plants n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
TRANSPORT IN PLANTS PowerPoint Presentation
Download Presentation
TRANSPORT IN PLANTS

Loading in 2 Seconds...

play fullscreen
1 / 28

TRANSPORT IN PLANTS - PowerPoint PPT Presentation


  • 152 Views
  • Uploaded on

TRANSPORT IN PLANTS. 2 types of transport tissue: XYLEM & PHLOEM. Vascular Cambium. creates new xylem cells on the inside, and new phloem cells on the outside. XYLEM & PHLOEM anatomy:. sieve cells. companion cells. plasmodesmata. XYLEM~ moves water and minerals.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'TRANSPORT IN PLANTS' - uriel-middleton


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide3

Vascular Cambium

creates new xylem cells on the inside, and new phloem cells on the outside.

xylem phloem anatomy
XYLEM & PHLOEM anatomy:

sieve cells

companion cells

plasmodesmata

xylem moves water and minerals
XYLEM~ moves water and minerals
  • Acts like a bundle of straws
  • functions via. negative pressure
  • “sucking”
  • http://www.youtube.com/watch?v=Ir9bm3fli90
xylem cells transport water dissolved minerals 2 kinds of cells
XYLEM cells (transport water & dissolved minerals) ~2 kinds of cells:

Tracheid= single cell, elongated, tapered ends (wall composed of cellulose)

* Pits (holes) between and surrounding these~

* Dead & hollow at maturity

* Conifers, have only these

xylem cells 2 kinds
XYLEM cells~ 2 kinds:

VesselElement = numerous elongated cells make up this tube. (typically smaller in length than tracheids, but wider in diameter)

* Have “pits” or openings on their ends and are stacked to create one long “pipe”

* Carry more water than tracheids

* Dead & hollow at maturity

* Conifers do not have these

xylem water movement b c of 2 forces
XYLEM ~ water movement b/c of 2 forces:
  • Transpirational pull- via. negative pressure as water is evaporated out of the stomata

http://www.youtube.com/watch?v=EKyHbanzYnI&feature=related

xylem water movement b c of 2 forces1
XYLEM ~ water movement b/c of 2 forces:
  • Transpirational pull- via. negative pressure
phloem has 2 types of cells
PHLOEM~ has 2 types of cells:

companion cells

sieve tube cells

phloem
PHLOEM

companion cells:

nucleus

sieve tube cells:

no nucleus

both types are alive

how do solutions move through the phloem ernst munch 1933 pressure flow hypothesis1

..

How do solutions move through the PHLOEM ~ Ernst Munch 1933PRESSURE FLOW HYPOTHESIS

Solutes move through plants as a result of pressure gradients, not negative pressure (aka. pulling)

slide16
SOURCE = area of excess sugar supply aka. leaf in the summer
  • SINK = area of storage aka. roots in the summer & winter
slide17
SINK = area of storage aka. leaf are in the spring
  • SOURCE = area of excess sugar supply aka. roots in the spring.
transport of sap
TRANSPORT OF SAP

(Photosynthesizing cell)

sugar

source

Phloem companion cell

1) @ SOURCE, sucrose moves from mesophyll cells into companion cells via. active transport

transport of sap1
TRANSPORT OF SAP

Photosynthesizing cell

Photosynthesizing cell

sugar

source

Phloem companion cell

2) Companion cells move sap into SIEVE TUBE CELLS via. active transport

slide20

Mineral absorption

  • Proton pumps
    • active transport (ATP) of H+ ions out of cell
      • chemiosmosis
      • H+ gradient
    • creates membranepotential
      • difference in charge
      • drives cation uptake
    • creates gradient
      • cotransport of othersolutes against theirgradient

ATP

H+

H+

H+

H+

H+

H+

H+

H+

H+

sugar

transport of sap2
TRANSPORT OF SAP

sugar

source

Phloem companion cell

3) Sugar accumulates in SIEVE TUBES, thus decreasing (lowering) water potential (aka. making more negative)

transport of sap3
TRANSPORT OF SAP

H2O

sugar

source

Phloem companion cell

4) WATER then, moves in from the XYLEM (as a result)… thus increasing turgor pressure in SIEVE TUBES -->

transport of sap4
TRANSPORT OF SAP

H2O

sugar

source

Phloem companion cell

5) thus moving sugar to areas of lower pressure (the sink).

transport of sap5
TRANSPORT OF SAP

sugar

source

Phloem companion cell

6) @ sink, sugar is unloaded from sieve tubes, thus INCREASING water potential...

transport of sap6
TRANSPORT OF SAP

H2O

sugar

source

Phloem companion cell

7) Water moved back into xylem… and UP via. negative pull