Summary
The cultivar effect on infection frequency (IF) was studied in the seedling and adult plant stages of 15 spring barley cultivars. In both stages the cultivar effects were highly significant. The cultivars L94 and Vada represented the extremes. Vada having about 2 1/2 times fewer uredosori than L94. Between cultivars and development stage clear interactions occurred. Pauline f.i. had the same low IF as Vada in the seedling stage, but in the adult plant stage its IF was about 70% higher. Also other effects could influence the cultivar effects. Increasing leaf age appears to increase IF. The cultivar effect also seemed to depend on the level of IF. At high levels the cultivars differed far less than at low levels of IF. The cultivar effect on IF appeared correlated with partial resistance in the field (r=0.7) through a high correlation with the cultivar effect on latent period (r=0.8).
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Parlevliet, J.E., Kuiper, H.J. Partial resistance of barley to leaf rust, Puccinia hordei. IV. Effect of cultivar and development stage on infection frequency. Euphytica 26, 249–255 (1977). https://doi.org/10.1007/BF00026985
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DOI: https://doi.org/10.1007/BF00026985