Abstract
The day-night periodicity in calcium (Ca) transport into fruits of tomato ( Lycopersicon esculentum Mill.) was investigated by growing plants with two trusses in aerated nutrient solution labelled with 45Ca for 11 h either during the day or at night. The import of Ca by tomato fruits was favoured at night, although it also occurred during the day, but at a much lower rate. The rates of Ca absorption and translocation from roots to shoots did not differ between the day and the night. Withholding the oxygen supply to roots at night, which is a cause of blossom-end rot of tomato fruits in hydroponics, greatly inhibited both the absorption of Ca from roots to shoots.
Published Version
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