Abstract
Abstract Male sterility research has been directed toward two goals: identifying genes required for the pollen development pathway and, more practically, identifying genetically stable lines that can be used in hybrid seed-breeding programs. The present resurgence of interest in male sterility remains true to these goals, but in addition seeks a molecular understanding of pollen development in order to genetically engineer controllable male sterility for hybrid seed production. In this review, we discuss the genetic and histochemical studies of tomato male sterile mutants that were conducted prior to 1970 in the context of gene expression and interaction. We also examine the use of molecular biological techniques in recent studies of male sterility and report on the current strategies being used for hybrid seed production.
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