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THE PLANT CELL, Vol 5, Issue 8 897-911, Copyright © 1993 by American Society of Plant Biologists
The Arabidopsis 1-Aminocyclopropane-1-Carboxylate Synthase Gene 1 Is Expressed during Early Development
R. A. Rodrigues-Pousada, R. De Rycke, A. Dedonder, W. Van Caeneghem, G. Engler, M. Van Montagu and D. Van Der Straeten
Laboratorium voor Genetica, Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
The temporal and spatial expression of one member of the Arabidopsis
1-aminocyclopropane-1-carboxylate (ACC) synthase gene family (ACS1) was
analyzed using a promoter-[beta]-glucuronidase fusion. The expression of
ACS1 is under developmental control both in shoot and root. High expression
was observed in young tissues and was switched off in mature tissues. ACS1
promoter activity was strongly correlated with lateral root formation.
Dark-grown seedlings exhibited a different expression pattern from
light-grown ones. The ACC content and the in vivo activity of ACC oxidase
were determined. ACC content correlated with ACS1 gene activity. ACC
oxidase activity was demonstrated in young Arabidopsis seedlings. Thus, the
ACC formed can be converted into ethylene. In addition, ethylene production
of immature leaves was fourfold higher compared to that of mature leaves.
The possible involvement of ACS1 in influencing plant growth and
development is discussed.
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