Abstract:
:Responses of superoxide dismutase (EC 1.15.1.1) and glutathione reductase (EC 1.6.4.2) activities were evaluated in leaf tissue from intact cotton plants (Cotton Branch 1697) which were exposed to 75% O(2), 350 microliters per liter CO(2) for 48 hours. Soluble protein was extracted from O(2)-treated and control tissue, and enzyme levels were determined. Superoxide dismutase activity in cotton leaf tissue was high (26 units per milligram protein) under normal conditions of 21% O(2), saturating light, and limiting CO(2), and neither qualitative nor quantitative differences in the cyanide-sensitive or -insensitive forms of the enzyme occurred in response to hyperoxic conditions. Glutathione reductase activity, however, was 2- to 3-fold higher in extracts from tissue exposed to 75% O(2). No increase in activity was observed for the peroxisomal enzymes, glycolate oxidase (EC 1.1.3.1) and catalase (EC 1.11.1.6). Results are consistent with an integrated pathway involving superoxide dismutase and glutathione reductase for protection of sensitive leaf components against detrimental effects of intermediate reduction products of O(2).
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Foster JG,Hess JLdoi
10.1104/pp.66.3.482subject
Has Abstractpub_date
1980-09-01 00:00:00pages
482-7issue
3eissn
0032-0889issn
1532-2548journal_volume
66pub_type
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