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Science 20 May 1977:
Vol. 196. no. 4292, pp. 887 - 889
DOI: 10.1126/science.196.4292.887
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Articles

Light and Stomatal Function: Blue Light Stimulates Swelling of Guard Cell Protoplasts

E. ZEIGER 1 and P. K. HEPLER 1

1 Department of Biological Science, Stanford University, Stanford, California 94305

Onion guard cell protoplasts swell when illuminated with blue light. The response is a 35 to 60 percent increase in volume and is dependent on potassium ion. Epidermal cell protoplasts do not swell under the same conditions. It is postulated that a membrane-bound blue photoreceptor mediates a direct response of guard cells to light.

Submitted on July 2, 1976
Revised on August 25, 1976


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