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Influence of osmotic stress on the respiration of potato solanum tuberosum cultivar bintje tuber callus



Influence of osmotic stress on the respiration of potato solanum tuberosum cultivar bintje tuber callus



Physiologia Plantarum 62(3): 398-403



Potato tuber callus shows a decrease in fresh weight and an increase in dry weight upon transfer to nutrient medium supplemented with 0.3 or 0.5 M mannitol. The osmolarity of the intracellular fluid increases simultaneously. Probably mannitol is taken up from the medium till the osmolarity of the tissue is in equilibrium with that of the medium. After osmotic adaptation on a medium with 0.5 M mannitol, growth is negligible although the tissue remains its viability. Respiration increase upon transfer to medium with extra mannitol, especially when expressed on a fresh weight basis. On this basis cytochrome and alternative pathway capacities do not change appreciably. The respiratory increase is exclusively caused by an increased engagement of the alternative pathway. The participation of this pathway in uninhibited respiration increases from .apprx. 10 to 90% upon transfer to medium with extra mannitol. The increase in respiration is partly correlated with the decrease in fresh weight upon transfer. Per disc, the capacities of the cytochrome and alternative pathway decline. Yet, total respiration per disc significantly increases due to the increased participation of the alternative pathway. This results is an almost equal ATP-production per disc before and after transfer. The alternative pathway may function as a reserve capacity in potato callus, which is switched on when ATP-production coupled to the cytochrome pathway is impaired.

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