Plant & Soil Sciences eLibraryPRO
Loading
control panel control panel
 

Herbicides That Act Through Photosynthesis

Rate Me
This lesson will examine herbicides that adversely affect light-related processes, thereby causing damage to plants. There are four basic mechanisms that will be studied in this class of agents: herbicides that inhibit or block synthesis of Protoporphyrin IX; herbicides that inhibit synthesis of carotenoids; herbicides that block Photosystem II electron transfer; and herbicides that divert electrons from Photosystem I. All share the ability to cause cellular damage in the presence of light.

Introduction for Herbicides that Act Through Photosynthesis

John Markwell
Department of Agronomy and Horticulture at University of Nebraska-Lincoln, USA
Deana Namuth
Department of Agronomy and Horticulture at University of Nebraska-Lincoln, USA
 


Lesson Navigation Tips:

  • Click on ’Animations’ button found to the left in order to view the animation which supplements this lesson. You can also click on the animation icon within the text.
  • Click once on figures to see enlarged versions.
  • Click once on words in color to bring up their definitions.

Overview

This lesson will examine herbicides that affect light-related cellular processes, thereby causing damage to plants. There are four basic mechanisms that will be studied: herbicides that inhibit or block synthesis of Protoporphyrin IX; herbicides that inhibit synthesis of carotenoids; herbicides that block Photosystem II electron transfer; and herbicides that divert electrons from Photosystem I. All share the ability to cause cellular damage in the presence of light.

Objectives

At the completion of this lesson, students will be able to differentiate between herbicides with modes of action based on:

  • Inhibition of carotenoid biosynthesis
  • Inhibition of protoporphyrinogen channeling
  • Inhibition of Photosystem II electron transfer
  • Uncoupling of Photosystem I electron transfer




Development of this lesson was supported in part by Cooperative State Research, Education, & Extension Service, U.S. Dept of Agriculture under Agreement Number 98-EATP-1-0403 administered by Cornell University and the American Distance Education Consortium (ADEC).
Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. This manuscript has been assigned Journal Series NO. 03-11, College of Agricultural Sciences and natural Resources, University of Nebraska.

Comments

Be the first to write a comment...

Control Panel cancel

Create activities for your moodle courses. Moodle Go to moodle
Select and group e-Library Lessons to create your own package... My Communities
Community Blogs Community Media

My Joined Communities

 
My Blogs - a journal of my thoughts... My Blogs
 
My Comments - my thoughts expressed as a feedback... My Comments
 
Classes that I am taking Registered Classes
Class Blogs Class Media
 
Check the scores of assesments that you have taken Taken Assessments
 
clear
Please confirm your selection.