Abstract
Two cultivars of tomato with contrasting response to elevated temperature were compared: sensitive — Roma and tolerant — Robin. Experiments were done on fruit explants and on rooted cuttings with small fruits. In both cases 45Ca was poorly transported to the fruits. Nevertheless in fruit explants elevated temperature (40°C) increased 45Ca import into the fruits in both culti vars. In the compared cuttings, treated or not treated with growth regulators and at various temperatures, the greatest differences were observed in the amount of 45Ca transported to the fruits. Sensitive Roma cuttings scantily supplied their fruits with 45Ca both under optimal temperature and heat stress. In plants previously treated with NOA + GA3 high temperature increased 45Ca transport to the fruits. Robin cuttings inversely responded to heat stress by transporting a much higher portion of 45Ca to the fruits, both in control and NOA + GA3 cuttings.
The diversity of 45Ca distribution during elevated temperature in cuttings, but not in fruit explants of both cultivars seems to be connected with an ability to control calcium supply to fruit or at least to prevent its decrease; this mechanism is perhaps located outside the cluster.
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Starck, Z., Siwiec, A., Chotuj, D. (1995). Distribution of calcium in tomato plants in response to heat stress and plant growth regulators. In: Baluška, F., Čiamporová, M., Gašparíková, O., Barlow, P.W. (eds) Structure and Function of Roots. Developments in Plant and Soil Sciences, vol 58. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3101-0_40
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DOI: https://doi.org/10.1007/978-94-017-3101-0_40
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