Abstract
It is generally believed that a restricted export of carbohydrates from source leaves causes oxidative stress because of an enhanced utilisation of O2 instead of NADP+ as electron acceptor in photosynthesis. To test this hypothesis, developmental changes of antioxidative systems were investigated in wild-type and transgenic tobacco (Nicotiana tabacum L.) suffering from disturbed sink-source relations by expression of yeast invertase in the apoplastic space. Young expanding leaves of the wild type contained higher activities of Superoxide dismutase (EC 1.15.1.1), ascorbate peroxidase (EC 1.11.1.11), catalase (EC 1.11.1.6), dehydroascorbate reductase (EC 1.8.5.1), glutathione reductase (EC 1.6.4.2) and a higher glutathione content than mature source leaves. The activity of monodehydroascorbate-radical reductase (EC 1.1.5.4) and the ascorbate content remained unaffected by the developmental stage in the wild type. In young expanding leaves of the transgenic plants the capacity of the antioxidative systems was similar to or higher than in corresponding leaves from the wild type. Source leaves of transgenic tobacco with an increased carbohydrate content showed a small chlorophyll loss, an increased malondialdehyde content, a selective loss of the activities of Cu/Zn-superoxide dismutase isoenzymes and a fourfold decrease in ascorbate compared with the wild type. There was no evidence that the protection from H2O2 was insufficient since source leaves of transgenic tobacco contained increased activities of catalase, ascorbate peroxidase, and monodehydroascorbate-radical reductase and an increased ascorbate-to-dehydroascorbate ratio compared with source leaves of the wild type. In severely chlorotic leaf sections of the transgenic plants, most components of the antioxidative system were lower than in green leaf sections, but the ascorbate-to-dehydroascorbate ratio was increased. These results suggest that carbohydrate-accumulating cells have an increased availability of reductant, which can increase the degree of reduction of the ascorbate system via glutathione-related systems or via the activity of monodehydroascorbate-radical reductase. At the same time, transgenic tobacco leaves seem to suffer from an increased oxidative stress, presumably as a result of a decreased consumption of O .-2 by Cu/Zn-superoxide dismutases in the chloroplasts. There was no evidence that carbohydrate-accumulating leaves acclimated to enhanced O .-2 production rates in the chloroplasts.
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Abbreviations
- Chl:
-
chlorophyll
- SOD:
-
Superoxide dismutase
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I am grateful to Dr. U. Sonnewald (Genbiologisches Institut, Gatersleben, Germany) for making transgenic and wild-type tobacco seeds available and to M. Brauer (Universität Bayreuth, Bayreuth, Germany) for advice on cultivation of the tobacco plants. I thank Prof. H. Rennenberg (Albert-Ludwigs-Universität, Freiburg, Germany) for critical reading of the manuscript and M. Eiblmeier for excellent technical assistence.
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Polle, A. Developmental changes of antioxidative systems in tobacco leaves as affected by limited sucrose export in transgenic plants expressing yeast-invertase in the apoplastic space. Planta 198, 253–262 (1996). https://doi.org/10.1007/BF00206251
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DOI: https://doi.org/10.1007/BF00206251