This site is supported by the advertisements on it, please disable your AdBlocker so we can continue to provide you with the quality content you expect.
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Unfortunately for Photobucket users, things have changed in a big way as of June 26th they are rolling out a $399 per year subscription fee for those who want to hotlink images from Photobucket’s servers to display elsewhere.
    This does not mean it only affects this site, It now means that billions of images across the Web now display an error message instead of the image in question. :(
    Dismiss Notice

Nutrient Transport from Root to Leaf

Discussion in 'Advanced Strategies and Fertilization' started by ceg4048, Apr 2, 2005.

  1. ceg4048

    ceg4048 Lifetime Charter Member
    Lifetime Member

    Mar 21, 2005
    Likes Received:
    Mr. Barr,
    I've read where terrestial plants and emersed plants use the mechanism of capillary action to pull water from roots to leaves. In one article (it may have been on the Tropica website) it was explained that as water evaporates from the leaf surface through exit pores at each "capillary" (there was probably a more scientic term) the vapor action pulled minute quantities of water up to fill the space voided by the evaporated water in the tube. By this action nutrients from the substrate is slowly "wicked" up to the leaves. I've always found it incredilble how tall trees pull tons of water from beneath the ground to distribute it several stories high without any moving parts.

    In the case of submerged plants this mechanism clearly cannot function so could you offer any insights as to how aquatic plants move water and nutrients from their roots to their leaves?

    This also begs the question of how the plant moves bouyant gases such as Oxygen from leaf downward to the roots?

  2. Gill Man

    Gill Man Prolific Poster

    Feb 10, 2005
    Likes Received:
    Re: Nutrient Transport from Root to Leaf

    There's more to it than just the "wicking" action. There's also the unique property of water and that's it's surface tension, which is what helps it attain great heights in trees.

    Submerged plants probably utilized simple diffusion to get molecules from areas of higher concentration of areas of lower concentration. I've noticed the substrate bubbling from time to time, but this may or may not be oxygen, but rather a byproduct of anaerobic activity.
  3. Tom Barr

    Tom Barr Founder
    Staff Member Administrator Social Group Admin

    Jan 23, 2005
    Likes Received:
    Re: Nutrient Transport from Root to Leaf

    There are concentrational difference that can drive this and also in the aquatic environment, both leaves and roots have access to the water, so they have far less transport issues to begin with.

    Phloem transport mechanism are very poorly understood even in terrrestrial plants. Munch's pressure flow hypothese is popular.
    While transpiration brings some nutrients, it does not transport many things.

    I'll post more later, got to finish some work here!

    Tom Barr

Share This Page