Effects of Diurnal Changes in the Salinity of the Nutrient Solution on the Accumulation of Calcium by Tomato Fruit |
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Authors: | HO, LIM C. ADAMS, PETER |
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Affiliation: | Plant Physiology Department, AFRC Institute of Horticultural Research Littlehampton, West Sussex BN17 6LP, UK |
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Abstract: | Tomato fruit grown in diurnally fluctuating salinities (8 mScm1 during the day and 3 mS cm1 at night; 8/3mS cm1), accumulated the same amount of dry matter andmagnesium (Mg) as those in constant 3 or 8 mS cm1, butan intermediate amount of calcium (Ca). Raising the salinityof the nutrient solution by enriching with macronutrients orby adding NaCl had similar effects. The uptake of 45Ca by tomato plants during the day was greaterthan at night and was reduced by salinity in both periods. Whilethe uptake of 45Ca by 8/3 mS plants at night was similar tothat of 3 mS plants, the daily uptake was less than that in3 and 5.5 mS plants. The Ca content of tomato fruit increased with truss number at3 and 5.5 mS cm1 but not at 8/3 and 8 mS cm1.Within the same truss, the distal fruit had a lower Ca contentbut higher Mg content than the proximal fruit. The reductionin Ca content of the distal fruit at 8/3 mS cm1 was similarto that at 5.5 mS cm1. The Ca content of the tissue atthe distal end of the 8/3 mS fruit was lower than that of the5.5 mS fruit. Similarly, the distribution of 45Ca to the distalhalf of the detached 8/3 mS fruit was less than that of 5.5mS fruit. A reduced uptake and inadequate distribution of Cato the truss and to the distal end of the 8/3 mS fruit werethe main causes of these differences. Lycopersicon esculentum(Mill.), tomato, fruit, calcium, magnesium, diurnal salinity |
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