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Effects of Ozone Exposure on Resistance of Wheat Genotypes to Pyrenophora tritici‐repentis
Author(s) -
Sah D. N.,
Tiedemann A. V.,
Fehrmann H.
Publication year - 1993
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1993.tb01383.x
Subject(s) - pyrenophora , biology , seedling , genotype , horticulture , inoculation , ozone , fumigation , poaceae , fungus , spots , agronomy , botany , cultivar , veterinary medicine , gene , genetics , medicine , physics , meteorology
Three spring wheat genotypes, susceptible, moderately resistant or resistant to Pyrenophora tritici‐repentis (tan spot fungus) were exposed to charcoal‐filtered air and to approx. 80, 160, 240 (g m −3 ozone for five consecutive days (7 h per day). Visible leaf injury on seedling plants (three‐leaf stage) was only observed after fumigation with 160 or 240 (g m −3 O 3 . Amount of injury was four‐fold and 10‐fold on the susceptible genotype when compared to resistant or moderately resistant genotype at the two highest concentration of ozone, respectively. Genotypic differences to O 3 tolerance were detected at the seedling growth stage (three‐leaf stage) and flowering stage but not at the stem elongation stage. A significant increase in tan spot lesion area was observed only on O 3 predisposed second top most leaves of the susceptible genotype at all the three levels of ozone. Predisposition did not enhance tan spot development in resistant and moderately resistant genotypes. In a test with 12 wheat genotypes, a highly significant positive correlation (r = 0· 986, p < 0· 0001) was observed between ozone sensitivity (percent leaf area damaged due to 240 (g m −3 ozone exposure) and tan spot development (mm 2 lesion area) following inoculation with P. tritici‐repentis . It indicates that wheat genotypes resistant to the tan spot fungus might be tolerant to ozone damage.