Improved Ssub(1) strawberry parents for breeding seedlings with anthracnose resistance, early flowering, and high fruit sugar contents
2016
Uchimura, Y. (Fukuoka Agriculture and Forestry Research Center, Chikushino, Fukuoka (Japan)) | Hayashida, T.
To breed efficiently new strawberry cultivars with anthracnose resistance, early flowering, and high fruit sugar contents, we improved the parents by self-fertilization. Anthracnose-resistant cultivars or lines were selfed, and then the progeny (the Ssub(1) population) were sprayed with a conidial suspension of anthracnose fungi. The surviving progeny were evaluated to determine flowering time and sugar contents. The parents 'Sanchiigo S1-2' (Ssub(1)) and '1-17-12' (Ssub(1)) were developed from the surviving progeny that showed early flowering and high fruit sugar contents. When these parents were crossed with the susceptible variety 'Fukuoka S6', the proportions of anthracnose-resistant seedlings in the populations were higher than that in the population derived from the cross between the existing anthracnose-resistant cultivar 'Sanchiigo' and 'Fukuoka S6', and that in the population derived from the cross between the existing anthracnose-resistant cultivar 'Strawberry Parental Line No. 2' and 'Fukuoka S6'. Furthermore, among the seedlings that survived spraying with a conidial suspension of anthracnose fungi, there were higher frequencies of early flowering and high fruit sugar contents in the seedlings derived from the crosses between the Ssub(1) parents and 'Fukuoka S6' than in those derived from crosses between the existing anthracnose-resistant cultivars and 'Fukuoka S6'. These results demonstrate that parents selected from Ssub(1) populations with anthracnose resistance, early flowering, and high fruit sugar contents are useful breeding materials to produce strawberry cultivars with those characteristics.
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