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guard cells in onion bulb epidermal cells

gross at georgian.edu gross at georgian.edu
Mon Mar 13 16:50:34 EST 2000

     Hi everyone,
     Today we were looking at plasmolysis in red onion bulb epidermal 
     cells in sucrose solutions of various concentrations, and I was 
     surprised to hear a student exclaim that she had found a stomate.  
     Sure enough there was one, surrounded by guard cells, and we saw 
     another in a section of the same epidermal peel.  I've been doing 
     this lab once a year for several years and have never found any 
     before.  I know the bulb is mostly made up of modified leaves so I 
     suppose the finding isn't that unusual, but I am wondering if others 
     have found guard cells in these tissues?  These sections were only 
     about 1/3 of the way into the bulb so we weren't close to the center 
     of the bulb.
     Mike Gross, Ph.D.
     Associate Professor of Biology
     Chairperson, Biology Department
     Georgian Court College
     Lakewood, NJ  08701


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