Gas Vacuole Development in a Blue-Green Alga

Science  21 Mar 1969:
Vol. 163, Issue 3873, pp. 1339-1341
DOI: 10.1126/science.163.3873.1339


De novo productioni of gas vacutoles can be induced in the blue-green alga Nostoc muscorum by transferring the cells from a defined medium to distilled water. The unusual ultrastructure of the gas vacuole membranes permits their easy recognition when specimens are prepared for electron microscopy by freeze-etching. The youngest gas vacuoles are biconical organelles; 48 hours after induction the gas vacuoles reach their miaximum observed length when they are cylinders (1.5 by 0.1 µ) with cornical ends.