From studies on ethylene biosynthesis in the pasture legume white clover (Trifolium repens L.), it is clear that transcription of the two committed enzymes in the pathway, ACC synthase and ACC oxidase, is under strict developmental control, as is common in many plant species (Chen and McManus, 2006; Hunter et al., 1999; Murray and McManus, 2005). In terms of post-translational control, there is now evidence from studies with the model plant Arabidopsis thaliana that ACC synthase activity is regulated by phosphorylation (Tatsuki and Mori, 2001). However, no similar evidence has been presented for ACC oxidase.
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References
Chen, B.C-M. and McManus, M.T. (2006) Expression of 1-aminocyclopropane-1- carboxylate (ACC) oxidase genes during leaf development of vegetative tissues in white clover (Trifolium repens L.) is regulated by ontological cues. Plant Mol. Biol. 60: 451-467
Gong, D. and McManus, M.T. (2000) Purification and characterisation of two ACC oxidases expressed differentially during leaf ontogeny in white clover. Physiol. Plant 110: 13-21
Hunter, D.A., Yoo, S.D., Butcher, S.M. and McManus, M.T. (1999) Expression of 1-aminocyclopropane-1-carboxylate oxidase during leaf ontogeny in white clover. Plant Physiol. 120: 131-141
Murray, P.A. and McManus, M.T. (2005) Developmental regulation of 1-aminocyclopropane-1-carboxylate synthase gene expression during leaf ontogeny in white clover. Physiol. Plant 124: 107-120
Tatsuki, M. and Mori, H. (2001) Phosphorylation of tomato 1-aminocycloprpoane- 1-carboxylic acid synthase, LE-ACS2, at the terminal region. J Biol. Chem. 276: 28051-28057
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Du, Z., Leung, S., McManus, M.T. (2007). Post-translational modification of ACC oxidase of white clover (Trifolium repens L.). In: Ramina, A., Chang, C., Giovannoni, J., Klee, H., Perata, P., Woltering, E. (eds) Advances in Plant Ethylene Research. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6014-4_7
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