Abstract
The present study was performed to see the physiological role of cytosolic ascorbate peroxidase (APX) and its relationship to other enzymes involved in the H2O2 scavenging metabolism, and also to elucidate the regulation of APX expression in dark-grown radish (Raphanus sativus L. cv Taiwang) cotyledons. To do so, 3-amino-l,2,4-triazole (aminotriazole), a known specific inhibitor of catalase, was used to simulate a catalase-deficient phenomenon in cotyledons. Aminotriazole, in very low concetration (10-4 M), inhibited remarkably the development of catalase activity in cotyledons during dark germination. This inhibition of catalase by aminotriazole, however, did not result in any significant changes in the growth response and the H2O2 level of developing cotyledons. In addition, the development of guaiacol peroxidase (GPX) activity was also not significantly affected. Unlike GPX, cytosolic APX activity was induced rapidly and reached a 1.7-fold increase in aminotriazole treated cotyledons at day 7 after germination. However,in vitro incubation of cytosolic APX preparation from cotyledons with aminotriazole did not result in any significant change in activity. One cytosolic APX isozyme (APXa) band involved in this APX activation was predominantly intensified in a native polyacrylamide gel by activity staining assay. This means that this APXa isozyme seems to play a key role in the expression of cytosolic APX activity. On the other hand, 2-day-old control seedlings treated with exogenous 1 mM H2O2 for 1 h showed a significant increase of cytosolic APX acitivity even in the absence of aminotriazole. Also, 2 μM cycloheximide treatment substantially inhibited the increase of APX activity due to aminotriazole. Based on these results, we suggest that a radish cytosolic APX could probably be substituted for catalase in H2O2 removal and that the expression of APX seems to be regulated by a change of endogenous H2O2 level which couples to APX protein synthesis in a translation stage in cotyledons.
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Literature cited
Asada, K. 1984. Chloroplasts; Formation of active oxygen and its scavengingMethods Emzymot. 105: 422–429.
Asada, K. 1992. Ascorbate peroxidase-a hydrogen peroxide-scavenging enzyme in plants.Physiol. Plant. 85: 235–241.
Bernt, E. and H.U. Bergmeyer. 1974. Inorganic peroxides.In Methods of Enzymatic analysis. Vol 4. H.U.Bergmeyer (ed.). Acad. Press, New York. pp. 2246–2248.
Bunkelmann, J.R. and R.N. Trelease. 1996. Ascorbate peroxidase-a prominent membrane protein in oil seed glyoxysomes.Plant Physiol. 110: 589–598.
Chance, B. and A.C. Maehly. 1955. Assay of catalase and peroxidase.Methods Enzymol. 2: 764–775.
Chen, G.-X. and K. Asada. 1989. Ascorbate peroxidase in tea leaves: occurrence of two isozymes and the difference in their enzymatic and molecular properties.Plant Cell Physiol. 30: 987–998.
Feierabend, J. and B. Schubert. 1978. Comparative investigation of the action of several chlorosis-inducing herbicides on the biogenesis of chloroplasts and leaf microbodies.Plant Physiol. 61: 1017–1022.
Ferguson, I.B. and S.J. Dunning. 1986. Effect of 3-amino-l, 2,4-triazole, a catalase inhibitor, on peroxide content of suspension-cultured pear fruit cells.Plant. Sci. 43: 7–11.
Foyer, Ch.H. and B. Halliwell. 1976. The presence of glutathione and glutathione reductase in chloroplasts: a proposed role in ascorbic acid metabolism.Planta 133: 21–25.
Havir, E.A. 1992. Thein vivo andin vitro inhibition of catalase from leaves ofNicotiana sylvestris by 3-amino-1..2.4-triazole.Plant Physiol. 99: 533–537.
Heim, D.R. and I.M. Larrinua. 1989. Primary site of action of amitrole inArabidopsis thaliana involves inhibition of root elongation but not of histidine or pigment biosynthesis.Plant Physiol. 91: 1226–1231.
Jablonski, P.P. and J.W. Anderson. 1982. Light-dependent reduction of hydrogen peroxide by ruptured pea chloroplasts.Plant Physiol. 69: 1407–1413.
Klapheck, S., I. Zimmer and H. Cosse. 1990. Scavenging of hydrogen peroxide in the endosperm ofRicinus communis by ascorbate peroxidase.Plant Cell Physiol. 31: 1005–1013.
Laemmli, U.K. 1970. Cleavage of structural proteins during the assembly of the head of bacteriophage T4.Nature 227: 680–685.
Lowry, O.H., M.J. Rosebrough, A.L. Farr and R.L. Randall. 1951. Protein measurement with the Folin phenol reagent.J. Biol. Chem. 193: 265–275.
MacRae, E.A. and I.B. Ferguson. 1985. Changes in catalase activity and hydrogen peroxide concentration in plants in response to low temperature.Physiol. Plant. 65: 51–56.
Margoliash, E., A. Novogrodsky and A. Schejter. 1960. Irreversible reaction of 3-amino-l,2,4-triazole and related inhibitors with the protein of catalase.Biochem. J. 74: 339–348.
Mittler, R. and B.A. Zilinskas. 1991. Purification and characterization of pea cytosolic ascorbate peroxidase.Plant Physiol. 97: 962–968.
Mittler, R. and B.A. Zilinskas. 1993. Detection of ascorbate peroxidase activity in native gels by inhibition of the ascorbate-dependent reduction of nitroblue tetrazolium.Anal. Biochem. 212: 540–546.
Nakano, Y. and K. Asada. 1981. Hydrogen peroxide is scavenged by ascorbate-specific peroxidase in spinach chlorolplasts.Plant Cell Physiol. 22: 867–880.
Prasad, T.K., M.D. Anderson, B.A. Martin and C.R. Stewart. 1994. Evidence for chilling-induced oxidative stress in maize seedlings and a regulatory role for hydrogen peroxide.Plant Cell 6: 65–74.
Price, A.H., A. Taylor, S.J. Ripley, A. Griffiths, A.J. Trewavas and M.R. Knight. 1994. Oxidative signals in tobacco increase cytosolic calcium.Plant Cell 6: 1301–1310.
Puntarulo, S., R.A. Sanchez and A. Boveris. 1988. Hydrogen peroxide metabolism in soybean embryonic axes at the onset of germination.Plant Physiol. 86: 626–630.
Rao, M.V., G. Pailyath and D.P. Ormrod. 1996. Ultraviolet-B-and ozone-induced biochemical changes in antioxidant enzymes ofArabidopsis thaliana.Plant Physiol. 110: 125–136.
Singer, S.R. and C.N. McDaniel. 1982. Transport of the herbicide 3-amino-l,2,4-triazole by cultured tobacco cells and leaf protoplasts.Plant Physiol. 62: 1382–1386.
Smith, I.K. 1985. Stimulation of glutathione synthesis in photorespiring plants by catalase inhibitors.Plant Physiol. 79: 1044–1047.
Taylorson, R.B. and S.B. Hendricks. 1977. Dormancy in seeds.Annu. Rev. Plant Physiol. 28: 331–354.
Tsaftaris, A.S. and J.G. Scandalios. 1981. Genetic and biochemical characterization of acat2 catalase null mutant oflea mays.Mol. Gen. Genet. 181: 158–163..
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Yi, K.A., Hong, YN. & Jin, CD. Regulation of ascorbate peroxidase activity in dark-grown radish cotyledons by a catalase inhibitor, 3-Amino-1,2,4-Triazole. J. Plant Biol. 40, 279–287 (1997). https://doi.org/10.1007/BF03030461
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DOI: https://doi.org/10.1007/BF03030461