Radiation interception and radiation use efficiency of near-isogenic wheat lines with different height |
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Authors: | Daniel J Miralles Gustavo A Slafer |
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Institution: | (1) Agricultural Research Centre of Finland (MTT), Institute of Crop and Soil Science, Plant Breeding Research Section, 31600 Jokioinen, Finland |
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Abstract: | Resistance to Pyrenophora teres Drechs. f. teres Smedeg., the net blotch pathogen, was studied in six 6-row Nordic spring
barleys (Hordeum vulgare L.) in the field and in the greenhouse. The barley genotypes were: Arve, Agneta, Artturi, H6221,
Pohto and WW7977. Disease progress was monitored in the field (1994 and 1995) in small artificially infected plots, sown at
commercial seeding rates, and in infected hill plots (1994). Areas under the disease progress curves (AUDPC) and apparent
infection rates (r) were calculated for the uppermost 3 or 4 leaves. Terminal severities (TS) were also recorded. Infection
response of seedlings to a range of P. teres isolates was assessed in the greenhouse using a standard scale. In small plots
in the field, Arve and Agneta were very susceptible to P. teres infection, as indicated by large values for AUDPC and TS.
H6221 and WW7977 were highly resistant, while Artturi and Pohto were moderately resistant. In hill plots the situation was
similar, except that Artturi and Pohto appeared less resistant than in the small plots. The relatively greater resistance
of H6221 and WW7977 was reflected in seedling infection responses. According to the results of these experiments, H6221 and
WW7977 possess adequate levels of quantitative resistance to P. teres to make them useful parents in future crossing programs
aimed at improving net blotch resistance in Finnish spring barleys.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | barley net blotch Pyrenophora teres quantitative resistance Hordeum vulgare |
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