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ERIC Number: EJ939676
Record Type: Journal
Publication Date: 2005
Pages: 5
Abstractor: As Provided
Reference Count: 15
ISSN: ISSN-0021-9266
Opening and Closing of Oxalis Leaves in Response to Light Stimuli
Nakanishi, Fumi; Nakazawa, Masami; Katayama, Nobuyasu
Journal of Biological Education, v39 n2 p87-91 2005
Fully opened leaves of potted plants of "Oxalis corymbosa" DC. closed completely by folding their leaflets downward after being kept in the dark for two hours. The folded leaflets, then moved upward gradually after exposure to light. We developed a simple method to measure the leaf movement. A paper protractor folded every 10[degrees] was devised to measure the opening angles between the stalk and main vein of each leaflet. The greater parts of the lamina of an excised leaf with its stalk were removed to measure the opening angles more correctly. It was confirmed that the processed-excised leaf exhibited the opening-closing movement in response to light stimuli in the same manner as an intact leaf. We investigated the effects of light quality (blue, red and white) on leaf movements with the processed-excised leaf and the paper protractor. It was demonstrated that the processed excised leaf of O. corymbosa is sensitive to blue light, but not to red light. The experiment described in the present paper is appropriate for studying the leaf nastic movement in secondary biology. (Contains 3 online resources, 1 footnote and 10 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: High Schools; Secondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A