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Three temperature-sensitive mutants of Arabidopsis thaliana that were defective in the redifferentiation of shoots were isolated as tools for the study of organogenesis. Plasticity is a key feature of cytodifferentiation in higher plants. In response to phytohormones and/or wounding, various types of mature, differentiated plant cells are reactivated so that they acquire organogenic competence and then proliferate to form shoots, roots, or somatic embryos. Physiological, biochemical, and molecular biological studies of this process have provided information important for an understanding of the differentiation of plant cells. However, in spite of many efforts, the key to organogenic competence and the molecular mechanisms of organogenesis is still unknown. Genetic analysis, which has not been exploited extensively in this field, can be expected to improve the present situation.With respect to organogenesis, dependence on genotype has bgen practically the only focus of genetics to date. Organogenic responses in tissue culture often vary, depending on genotype. The genetic basis of such variations has been studied in severa1 crop species (Ohki et al

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