Ethylene biosynthesis in Regnellidium diphyllum and Marsilea quadrifolia |
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Authors: | Jacqueline Chernys Hans Kende |
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Institution: | (1) MSU-DOE Plant Research Laboratory, Michigan State University, 48824-1312 East Lansing, MI, USA |
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Abstract: | The pathway of ethylene biosynthesis was examined in two lower plants, the semi-aquatic ferns Regnellidium diphyllum Lindm. and Marsilea quadrifolia L. As a positive control for the ethylene-biosynthetic pathway of higher plants, leaves of Arabidopsis thaliana (L.) Heynh. were included in each experiment. Ethylene production by Regnellidium and Marsilea was not increased by treatment of leaflets with 1-aminocyclopropane-1-carboxylic acid (ACC), the precursor of ethylene in higher plants. Similarly, ethylene production was not inhibited by application of aminoethoxyvinylglycine and -aminoisobutyric acid, inhibitors of the ethylene biosynthetic enzymes ACC synthase and ACC oxidase, respectively. However, ACC was present in both ferns, as was ACC synthase. Compared to leaves of Arabidopsis, leaflets of Regnellidium and Marsilea incorporated little 14C]ACC and 14C]methionine into 14C]ethylene. From these data, it appears that the formation of ethylene in both ferns occurs mainly, if not only, via an ACC-independent route, even though the capacity to synthesize ACC is present in these lower plants.Abbreviations ACC
1-aminocyclopropane-1-carboxylic acid
- AdoMet
S-adenosyl-l-methionine
- AIB
-aminoisobutyric acid
- AVG
aminoethoxyvinylglycine
This research was supported by the U.S. Department of Energy through grant No. DE-FG02-91ER20021 and, in part, by a fellowship of the National Engineering and Research Council of Canada to Jacqueline Chernys. |
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Keywords: | 1-Aminocyclopropane-1-carboxylic acid 1-Aminocyclopropane-1-carboxylic acid oxidase 1-Aminocyclopropane-1-carboxylic acid synthase Marsilea Regnellidium |
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