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Inheritance of male sterility in peach [ Prunus persica  (L.) Batsch] Plant Introduction (PI) 240928 was investigated. Crosses of PI 240928 with five wild-type clones yielded all male-sterile offspring, indicating dominant gene action. Inheritance of the sweet kernel trait in peach was studied in F 1  and F 2  progeny of `Summer Beaut' nectarine (sweet kernel) × `Biscoe' peach (bitter kernel). All four F 1  progeny were bitter. Segregation in an F 2  of 80 progeny fit a ratio of 3 bitter: 1 sweet. We propose that the gene controlling the sweet kernel trait be designated  sk.  Sweet kernel ( sk ) was linked to nectarine ( g ) at a map distance of 17 cM. Evaluation of the peach PI collection showed that PI 129678 (`Stanwick' nectarine) and PI 34685 (`Quetta' nectarine) were the only clones with a sweet kernel. Crosses between `Davie II' and `Honeyglo' nectarine ( dwdw ) confirmed that the gene conferring the dwarf phenotype in progeny of `Davie II' is non-allelic to  dw .

Inheritance and Linkage Studies in Peach