Ultrastructural studies on the expression mechanism of male sterility in Cryptomeria japonica

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The process of pollen development and the mechanism of male sterility in Cryptomeria japonica were studied using cytobiological and molecular approaches. The patterns of pollen degeneration causing male sterility such as defects in meiosis, failure in separation of individual microspores from tetrads, and abnormal microspore development were clarified in four male-sterile C. japonica trees found in Niigata, Japan. In addition, two genes encoding potassium membrane transport proteins were isolated from C. japonica. Analyses of these genes indicated that they were involved in the uptake or release of cellular potassium in male cones.