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Calcium was present in the pectin fraction of tomato leaf cell wall in association with pectin constituents and with a pectin-protein complex. Boron deficiency induced a decrease in the amount of Ca associated with pectin constituents. Most of the boron in the pectin fraction obtained by pectinase treatment was in a free form. These results suggest that boron plays an important role in Ca metabolism in the cell wall.
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Yamauchi et al. (1986) studied this question.
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