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Scanning electron microscopy of aecio spore formation in puccinia bolleyana



Scanning electron microscopy of aecio spore formation in puccinia bolleyana



Scanning Electron Microscopy (3): 299-304



Aecia of P. bolleyana are produced primarily on the under surface of infected leaves [of Sambucus canadensis L.]. The aecium is a cup-like depression bounded by a peridium consisting of a single layer of thick walled cells. The aecium is filled with chains of developing and mature aeciospores. Lining the base of the aecium are many cylindrical sporogenous cells that give rise to a succession of aeciospore mother cells. Once formed, the mother cell enlarges slightly and undergoes an unequal division to form a larger cell and a smaller disjunctor cell that remains attached to the larger cell. The disjunctor cell eventually dies while the larger cell develops into an aeciospore. The surface of the aeciospore is at first smooth but large granules eventually develop in a ring around either the middle or, more typically, the distal end of the spore. The primary wall of the spore distintegrates and is sloughed-off the spore to reveal many small, cog-like surface ornamentations. Such ornamentations are absent from the distal end of the spore in the region at which the spore contacted the disjunctor cell of the next spore in the chain. Mature aeciospores are globoid in shape and most measure 13.mu.m .times. 15 .mu.m.

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