Abstract
Beet cyst nematode-resistant cultivars, which were introduced recently, originated from the homozygous inbred line B883. This translocation product was unstable and the transmission of resistance when crossed with a susceptible cultivar did not exceed 94%. Tests with the resistant cultivars in climate cabinets showed a wide variety of resistance against Heterodera schachtii and beet necrotic yellow vein virus (BNYVV), expressed as average numbers of infective units per plant and percentages of resistant plants. In a series of field trials at different levels of infection of H. schachtii, their multiplication rates on all resistant cultivars depended on the initial density, which was caused by the presence of small numbers of susceptible plants. Since tolerance to wilting was also incorporated in B883, reasonable yields were obtained in the presence of H. schachtii. However, at increasing initial densities of H. schachtii, yields decreased considerably, since penetrating juveniles cause a hypersensitivity reaction in resistant plants. Based upon the results of three series of field trials, it was concluded that resistant cultivars should preferably be applied at population densities between 500 and 2000 eggs and juveniles of H. schachtii per 100ml of soil. Cultivars with double resistance against H. schachtii and BNYVV behaved like those with H. schachtii resistance in soils infected with beet cyst nematodes, but not with BNYVV. In soils with a combined infection of H. schachtii and BNYVV double resistant cultivars were far superior to single resistant ones, since damage caused by BNYVV was far more serious than damage caused by H. schachtii. No substantial interaction between soil pathogens nor types of resistance could be detected.
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Heijbroek, W., Munning, R. & van Swaaij, A. The Effect of Different Levels of Beet Cyst Nematodes (Heterodera schachtii) and Beet Necrotic Yellow Vein Virus (BNYVV) on Single and Double Resistant Sugar Beet Cultivars. European Journal of Plant Pathology 108, 735–744 (2002). https://doi.org/10.1023/A:1020874511047
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DOI: https://doi.org/10.1023/A:1020874511047