ISHS Acta Horticulturae 92: Symposium on Mineral Nutrition and Fruit Quality of Temperate Zone Fruit Trees
AUTORADIOGRAPHIC LOCALIZATION OF 45CA AND 36Cl AFTER POSTHARVEST DIPPING OF APPLE FRUITS |
| Author: | J. WIENEKE |
| Abstract:
The aim of the study was to obtain some information about the fate of calcium on a cellular level after postharvest dipping of apple fruits (2 per cent CaCl2 plus 0.3 per cent keltrol (a xanthan gum) thickener) and to elucidate whether and to what extent chloride may also penetrate through the skin. The results showed that chloride migrated into the cortex tissue, increasingly with time of storage (see Table 54.1). Autoradiographs revealed that
after dipping of Cox's Orange Pippin or Golden Delicious apples either with 45CaCl2 or Ca36Cl2 solution the calyx and stem base cavity were marked sites of entry of the radioactivity. After three months storage at 4°C, most of the chloride was retained in the cortex region whereas calcium was distributed deeper, reaching the centre of the fruit. Unlike the chloride, calcium was obviously present in or near the vascular tissues. Penetration and migration of calcium was related to the concentration in the applied solution. Compared with 45Ca, the monovalent cations 22Na and 86Rb (tracer for potassium) once absorbed through the skin, were much more mobile within the fruit. | |
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