Frequent Occurrence of Precocious Flowering in Zygotic Seedlings Derived from Crosses with a Monoembryonic and Male Sterile Acid Citrus Hybrid between Yuzu (C. junos Sieb. ex Tanaka) and Hanayu (C.hanaju Hort.exShirai)

概要

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We successfully produced a male sterile and monoembryonic acid citrus hybrid plant that generated seedlings showing precocious flowering with high rates. Of 26 crosses with 16 acid citrus cultivars, three ('Sudachi'*'Yuzu', 'Hanayu'*'Kabosu' and 'Hanayu'*'Yuzu') were firstly found to generate precociously flowered seedlings with low rates. Second, 23 bybrid seedlings with 'Hanayu', 'Kabosu' and 'Sudachi' in their parents were crossed with 'Hanayu', 'Kabosu' and 'Yuzu', and then the cross (HY-16*'Yuzu') was found to generate precocious seedlings with a high rate of 6%. When the hybrid plant HY-16 derived from 'Hanayu'*'Yuzu' was crossed with 'Yuzu' in different years, it constantly generated seedlings showing precocious flowering with a rate of 6%, but it did not genetate them when it was crossed with 'Hanayu'. When HY-16 was crossed with grapefluit cultivars, it generated seedlings exhibiting precocious flowering with very high rates of anout 15%. The seedlings derived from 'Hanayu'*'Yuzu' and selfing of 'Hanayu' and 'Yuzu' genetated seedlings showing precocious flowering with low rates of about 1%. HY-16 was a male sterile and monoembryonic plant with fruitful and seedy characters.
九州大学の論文