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