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What is Hormonal Control of Peroxidase Activity in Germinating Mung Bean Cotyledons about?

rise in peroxidase activity (22-35 fold) was observed in excised mung bean cotyledons 72 hr after germination. The enhanced enzyme activity was associated with the appearance. of six new multiple forms of peroxidase. Supraoptimal concentration of auxin (IAA, 10e4 M, 10e3 M) brought about additional promotion (2-4 fold) of peroxidase activity over the water controls. Substitution of auxin by ethrel failed to enhance peroxidase activity, suggesting that the auxin response is not an ethylene mediated phenomenon. Gibberellic acid and kinetin also failed to alter the peroxidase activity and its multiple forms in excised cotyledons. However, cotyledons treated with abscisic acid (ABA. 100 II g/ml1 showed a strong inhibition (87 'Y) of neroxidase activity and this response was \.\_\_.\_, --\_ppl\_~, ~~~~ ,", \_\_ =\_~~.\_ \_\_\_ substantially counteracted by auxin. Actinomycin D and cycloheximide severely reduced peroxidase activity both in controls and auxin-treated cotyledons. This indicated the requirement of transcription and translation for the enhancement of peroxidase activity in germinating cotyledons.

Author

J.P.S. Dendsay; R.C. Sachar

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0031-9422)

Published

1978

Language

EN