Godt, Dietmute E. and Roitsch, Thomas (1997) Regulation and tissue-specific distribution of mRNAs for three extracellular invertase isoenzymes of tomato suggests an important function in establishing and maintaining sink metabolism. PLANT PHYSIOLOGY, 115 (1). pp. 273-282. ISSN 0032-0889, 1532-2548
Full text not available from this repository.Abstract
The aim of the present study was to gain insight into the contribution of extracellular invertases for sink metabolism in tomato (Lycopersicon esculentum L.). The present study shows that extracellular invertase isoenzymes are encoded by a gene family comprising four members: Lin5, Lin6, Lin7, and Lin8. The regulation of mRNA levels by internal and external signals and the distribution in sink and source tissues has been determined and compared with mRNA levels of the intracellular sucrose (Suc)-cleaving enzymes Suc synthase and vacuolar invertase. The specific regulation of Lin5, Lin6, and Lin7 suggests an important function of apoplastic cleavage of Suc by cell wall-bound invertase in establishing and maintaining sink metabolism. Lin6 is expressed under conditions that require a high carbohydrate supply. The corresponding mRNA shows a sink tissue-specific distribution and the concentration is elevated by stress-related stimuli, by the growth-promoting phytohormone zeatin, and in response to the induction of heterotrophic metabolism. The expression of Lin5 and Lin7 in gynoecia and stamens, respectively, suggests an important function in supplying carbohydrates to these flower organs, whereas the Lin7 mRNA was found to be present exclusively in this specific sink organ.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SUCROSE-SYNTHASE GENE; CELL-WALL INVERTASE; MESSENGER-RNA LEVELS; VICIA-FABA L; ACID INVERTASE; CHENOPODIUM-RUBRUM; CARBOHYDRATE-METABOLISM; APOPLASTIC INVERTASE; SUSPENSION-CULTURES; BETA-VULGARIS |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Lehrstuhl für Zellbiologie und Pflanzenphysiologie (Prof. Dr. Klaus Grasser) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 30 Mar 2023 08:05 |
| Last Modified: | 30 Mar 2023 08:05 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50632 |
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