Cytoplasmic male sterility in petunia

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Abstract
Cytoplasmic male sterility in petunia was shown to be under plasmon–genome control. The male-sterile pheno type was variable in that breakdown at different stages of microsporogenesis and gametogenesis is under the control of a multiple genes system. Comparison of the known restorers in several petunia species revealed that male fertility restoration can be achieved by I) a single dominant gene that is not temperature sensitive, and 2) a multiple genes system that is temperature sensitive; dif ferent amounts of the proper alleles affect breakdown from early meiosis to full fertility. Different aspects of this work and a possible mode of action of the restorer genes are discussed.

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