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KMID : 0903619910320020163
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Journal of the Korean Society for Horticultural Science
1991 Volume.32 No. 2 p.163 ~ p.172
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Calcium , Magnesium and Potassium Ion Uptake in Normal and rin Tomato Plants and Their Accumulation in Fruti Cell Wall
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Abstract
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In this study, the Ca^(++), Mg^(++), and K^(++) uptake in normal and rin tomato plants was observed, and the content of the canons in cell wall of fruit tissues determined. Different concentrations of Ca^(++) treatment in growing media did not significantly affect Ca^(++) uptake. However, petioles, leaves, and pericarp tissues of rin tomato retained more amount of Ca^(++) than those of normal ones. Thus it is conceivable that Ca^(++) uptake of rin is more remarkable compared to that of normal tomato. The percentage of dried cell wall per fresh weight was maintained constant in rin during ripening but decreased slowly in normal tomato. The cell wall-bound (CWB) Ca^(++) content of rin pericarp tissues continued to increase to stage III after harvest, but that of normal tomato dropped at earlier stage II. Pectinmethylesterase (PME) activity increased in both cultivars, and the dee-sterification by PME action w as vigorous in normal tomato, compared to rin. It was suggested that the nonripening characteristics of rin are in part attributed to the more active Ca^(++) uptake in the mutant plant and Ca^(++) accumulation in its cell wall. Ripening also appears to be dependent upon the combined actions of PG, PME, and Ca^(++), and a timing sequence of these actions may be important in ripening mechanism.
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