title: 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.
authors.forename: E
authors.initials: E
authors.lastname: Zeiger
authors.forename: P K
authors.initials: PK
authors.lastname: Hepler