ISHS Acta Horticulturae 567: IV International Strawberry Symposium
INHERITANCE AND ACTUAL BREEDING OF STRAWBERRY RESISTANT TO ANTHRACNOSE |
| Author: | T. Mori |
| Keywords: | Fragaria x ananassa, Glomerella cingulata, Colletotrichum fragariae, selection response, recurrent selection |
| DOI: | 10.17660/ActaHortic.2002.567.10 |
| Abstract:
In Japan, one of the most prevalent problems in strawberry production is the control of anthracnose. The development of a resistant cultivar has been expected for some time. First, genetic variation in resistance to anthracnose was analyzed in seedlings derived from 25 crosses. Narrow- and broad-sense heritabilities were es-timated to be 0.76 and 0.86, suggesting the presence of largely additive effect (Expt.1). Second, selection responses in the upward direction from F1 to F2 were tested in three families crossed between the parents of three cultivar with suscepti-ble(S), medium(M) and resistant(R). The heritabilities were 0.30, 0.61 and 0.04 in the families of SxM, SxR and MxR, respectively. In the seedling population with diverse variants, highly effective selection was expected (Expt.2). It appeared that concentration of resistant genes was feasible by recurrent selection. In the actual breeding, we sprayed the conidial suspension of anthracnose to the seedlings at an early growing stage in each generation, and removed dead seedlings. Clonal selec-tions were performed and the crosses for next generation carried out between the selected clones in every year. As a result, survived seedlings after inoculation had been increasing every year. Finally, a superior clone was found. It had high resis-tance to anthracnose, high fruit-quality and suitable characters for culture, and named ‘Sanchiigo’. | |
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