Disease resistance sources in different Beta population
2000
Luterbacher, M.C. | Smith, J.M. | Asher, M.J.C. (Institute of Arable Crops Research Broom's Barn, Higham (United Kingdom))
As part of a EU-funded programme (GENRES CT95-42) 600 Beta accessions are being screened for resistance to several important sugar beet diseases, including beet mild yellowing virus (BMYV), beet yellows virus (BYV), seedling damping-off (Aphanomyces cochlioides and Pythium ultimum), and powdery mildew (Erysiphe betae). Most Beta accessions are of cultivated origin (60 percent of total) but other non-cultivated Beta species are being tested, the most common of which is Beta vulgaris spp. maritima (25 percent). Available results indicated that there are a significant number of accessions with much lower levels of infection than standard sugar beet cultivars. For BMYV and BYV, about 3 percent of accessions tested were highly resistant. A similar incidence of resistance has been observed for Aphanomyces damping-off disease (2 percent) although for Pythium the figures are higher at 15 percent. Some very high levels of resistance have been observed for powdery mildew but overall the incidence is relatively low (0.4 percent) when compared to the other traits. After confirmation of resistance, individual plants are selfed in order to test for heritability in the progeny. Early tests have shown that the BMYV trait is inherited by the progeny of resistant parents.
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