Spring.wmf (18300 bytes) Plant Physiology (Biology 327)  - Dr. Stephen G. Saupe;  College of St. Benedict/ St. John's University;  Biology Department; Collegeville, MN  56321; (320) 363 - 2782; (320) 363 - 3202, fax;    ssaupe@csbsju.edu

Starch Prints

    In lab we will make "starch prints" using bean and/or geranium leaves.  To do so, we will follow the procedures supplied in the references cited below.

    Here's an experimental idea from Dr. Walker (University Sheffield, UK):  What would happen if we float leaf disks on water +/-  sucrose and +/- light overnight and then killing and staining as usual?  In which treatment(s) will starch form?

Hypotheses:  for each of the following treatments, record your prediction for whether starch will be formed or not.

Treatment Predicted Starch formation (+ or -)
disks + water + dark →  
disks + sucrose + dark →  
disks + water + light →  
disks + sucrose + light →  

References:

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Last updated:  01/07/2009     � Copyright  by SG Saupe