| Abstract: | Peroxidase-containing enzyme supernatant preparations of tobaccoabscission zone flower pedicel tissue sections of ethylene-treatedand untreated Nicotiana tabacum L. plants were assayed for u.v.absorption spectra with and without the addition of IAA. Theu.v. spectral absorption of peroxidase-catalysed IAA oxidationindicated that there is not an appreciable difference in absorbancepeaks in the ethylene-treated plants compared with untreatedcontrols, in the presence of added IAA; however, the ethylene-treatedtissues alone show different absorption peak values in the 1,2, 3, 4, 4.5, and 5 h samples. These results are discussed inrelation to ethylene-induced peroxidase activity in tobaccoflower pedicel abscission zone tissue homogenates. |
