Several people have asked for help finding lab exercises for undergraduate students. Here are some places to look:
ABLE is the Association for Biology Laboratory Education, and has loads of good peer-reviewed biology labs, including 148 tagged as "plant biology" (http://www.ableweb.org/proceedings/SPT--BrowseResources.php?FieldId=80). Most are open-access.
The journal Cell Biology Education (CBE - http://www.lifescied.org/) also has some suitable labs including "A Study of Rubisco through Western Blotting and Tissue Printing Techniques" (http://www.lifescied.org/content/8/2/140.abstract?sid=11f0bb7d-9163-4f15-8523-d0ba3dfc5ce2)
as does the Journal of Natural Resources and Life Science Education, including "A Novel Experimental Design for Examining Bryophyte Response to Increased Ultraviolet Radiation" (https://www.agronomy.org/publications/jnrlse/articles/38/1/27?highlight=).
Starting with really durable exercises that work with younger students can be helpful, and both Wisconsin Fast Plants and Science and Plants for Schools (SAPS) are experts at developing "fool-proof" activities. Here are some suitable for older students from WFP (http://fastplants.org/resources/digital_library/index.php?P=BrowseResources&ParentId=217) and SAPS (http://www.saps.org.uk/secondary/teaching-resources)
Simlarly, these 12 activities developed to accompany the "12 principles of plang biology" are designed for younger students but can be launching off points for inquiry by older students (http://tinyurl.com/c2crwuu).
Finally, one of the classics is the book "Experiments in Plant Physiology", published in 1994 by Carol Reiss (http://www.pearsonhighered.com/educator/product/Experiments-in-Plant-Physiology/9780137012855.page). You might be able to find a copy through a library, or ask other people in your department if they've got one. And for general tips, here's a good article from Carol called "Teaching a Plant Physiology Laboratory for the First Time?" (http://my.aspb.org/members/group_content_view.asp?group=72494&id=100286)
I'd be happy to post other resources if anyone has any to share (hint hint)
Via Mary Williams