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Differential Foliar Sensitivity of Soybean Cultivars to Ozone Associated with Differential Enzyme Activities
Author(s) -
TINGEY DAVID T.,
FITES ROGER C.,
WICKLIFF CARLOS
Publication year - 1976
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1976.tb01874.x
Subject(s) - cultivar , polyphenol oxidase , phenylalanine ammonia lyase , peroxidase , ozone , glycine , enzyme , horticulture , chemistry , biology , botany , biochemistry , amino acid , organic chemistry
Soybean [ Glycine max (L.) Merr.] cultivars Dare and Hood were exposed to ozone (980 μg/m 3 ) for 2 h to determine if differences in cultivar sensitivity were associated with differential activation of selected enzymes. The first trifoliate leaves of the cultivars were in similar stages of development (14 days from sowing) when exposed. The ozone treatment increased the activities of glucose 6‐phosphate dehydrogenase, phenylalanine ammonia lyase, polyphenol oxidase and peroxidase above the control in both cultivars within 30 h after exposure. However, the activity of all these enzymes increased several hours sooner in Dare (sensitive) than in Hood (tolerant). Our data suggest that the differential sensitivity of these two cultivars to ozone could be based on the differential ozone induced activation of the enzymes involved in the lesion formation process.