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Science. 1977 May 20;196(4292):887-9.

Light and stomatal function: blue light stimulates swelling of guard cell protoplasts.

Abstract

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.

PMID:
17821809
[PubMed]
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