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Mechanism of Male Sterility in a Clone of Orchardgrass (Dactylis glomerata L.)¹

Cytological and histological studies were carried out on a male-sterile clone, OD-1, of Dactylis glomerata L. The chromosome number and meiotic chromosome behavior of this clone were normal for the species. During microsporogenesis, degeneration of some sporogeneous tissue was observed at the initial stages of meiosis. Later, there was a very rapid degeneration of the tapetum and microspores. At anthesis, there was no evidence of pollen. The cell layers of the anther wall did not develop characterisfically, resulting in a small nondehiscent anther.

² Graduate Assistant and Associate Professor, respectively, Department of Crop Science, Ontario Agricultural College, University of Guelph, Guelph, Ontario, Canada.

Received for publication February 26, 1966.