COMPOSITIONS OF PEEL OILS FROM CITRUS HYB RIDS, HAYAKA, SOUTHERN RED,AND SHIRANUI

The compositions of peel oils from three citrus hybrids, 'Hayaka' of ' Imamura unshiu' (Citrus unshiu Marc), 'Southern red' of 'Kara' (Citrus unshiu Marc x Citrus nobilis Lour.), and 'Shiranui' of 'Kiyomi' (Citr us unshiu Mare x Citrus sinensis Osbeck) crossed with 'Nakano No.3 pon kan' (Citrus reticulata Blanco) were studied. Peel oil from fruit-rind tissue was prepared by simultaneous distillation and extraction under reduced pressure. Each peel oil was separated into hydrocarbon and ox ygenated-compound fractions in a silica gel column and analyzed by cap illary gas chromatography-mass spectrometry. The proportions of the hy drocarbon fractions and oxygenated-compound fractions of all hybrids w ere similar to those in 'Nakano No.3 ponkan'. From the pattern similar ity of the composition of the hydrocarbons, 'Hayaka' was not similar t o either parent, but 'Southern red' was similar to both parents. The c omposition of the hydrocarbons in 'Shiranui' was similar to that in 'K iyomi'. From the pattern similarity of the compositions of the oxygena ted compounds,'Hayaka' and 'Shiranui' were more similar to 'Nakano No. 3 ponkan' than their seed parents, but 'Southern red' was different fr om its parents.