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Emmer wheat with the cytoplasm of Aegilops oval a obtained by means of successive backcrosses is characterized by its male-sterility (Fukasawa, 1953). Cytological investigation on the pollen degeneration in the sterile anthers, shows that microspore development proceeds normally with complete pairing of 14 bivalents at meiosis. After liberation from tetrads the microspores fail to develop, degenerating in the course of pollen mitosis (Fukasawa, 1956). A similar degeneration of pollen grains can be induced artificially in normal wheat plants. For example, when stalked young spikes with two leaves are cut off at the stage of pollen mitosis and placed in the dark for about one week, white spikes without chlorophyll emerge from the leaf-sheath, and no good pollen grains are formed (Fukasawa, 1956). The degree of pollens degeneration in the dark increases extremely when the plant is cut off at the meiotic stage. The present report deals with the experimental results concerning the restoration of pollen formation by supplying sugar to the culture solution in the dark, and a preliminary attempt to resolve the mechanism of pollen degeneration in cytoplasmic male-sterile wheat. In addition the study deals with an attempt to prevent the degeneration of pollen grains in the male.sterile wheat, and a paper chromatographic analysis to survey the sugars present in male-sterile and normal anthers.

Preventative Effect of Sugars on the Pollen Degeneration of Wheat Plant