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In vitro formation of H2O2 by AWF proteins extracted from leaves of cowpea cv TVu 91 and cv TVu 1987 as affected by Mn supply during cultivation of plants. Plants were treated with 50 μm Mn for 4 d, whereas control plants received 0.2 μm Mn continuously. Values are means of independent replicates ±se, n = 12. Levels of significance of F test are shown by *, **, and *** for P < 0.05, 0.01, and 0.001, respectively.
