Abstract
Abstract By means of calcofluor staining, cell elongation measurements, and microspectrofluorometry, diffuse cell wall deposition is demonstrated for the first time in the red algae in Audouinella dasyae (Acrochaetiaceae, Acrochaetiales), Spermothamnion repens and Tiffaniella snyderae (Ceramiaceae, Ceramiales). Measurements of cell length indicate that cell elongation is occurring, but neither visual inspection nor microspectrofluorometry of cells stained with calcofluor show band deposition. The Rhodophyta thus possess all three mechanisms of cell wall deposition known to operate in plants: apical cell wall deposition in all apical cells examined to date, and either band deposition or diffuse deposition in intercalary cells. These results suggest that patterns of wall deposition may be a useful systematic character in Ceramiaceae, with the tribe Spermothamnieae possessing diffuse growth, and other tribes investigated to date exhibiting band growth.
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