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Partial resistance of barley to leaf rust puccinia hordei part 5 analysis of the components of partial resistance in 8 barley cultivars



Partial resistance of barley to leaf rust puccinia hordei part 5 analysis of the components of partial resistance in 8 barley cultivars



Euphytica 27(1): 33-40



Eight spring barley [Hordeum vulgare] cultivars ['L94', 'L98', 'Mamie', 'Sultan', 'Zephyr', 'Volla', 'Julia', 'Vada'] representing the known range in partial or slow rusting resistance to P. hordei were investigated for their effects on the components of partial resistance: infection frequency, latent period, infectious period and spore production per uredosorus per day. Considerable variation was observed among the cultivars for each of the components. The cultivar effects on the components tend to be associated. Cultivar L94, e.g., shows the highest infection frequency, the shortest latent period and a long infectious period. 'Julia' and 'Vada' have a low infection frequency, a long latent period and a low spore production per sorus per day. This association is only partial. The total spore production per unit leaf area (the combined result of the 4 components) appeared highly correlated with the partial resistance in the field (r = 0.85). Only a relatively small portion of the variation in partial resistance cannot be explained by the 4 components studied. Several other aspects which might affect the rate of epidemic development are discussed. Latent period, measuring the onset of the new spore production, estimated partial resistance as well as did total spore production (r = -0.85). To evaluate the partial resistance of barley genotypes in the greenhouse the latent period is preferred above total spore production, as it is measured more easily, more accurately and sooner after inoculation.

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Accession: 006066810

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