Nitrogen, Phosphorus, and Potassium Distribution in Relation to Apical Dominance in Dwarf Bean (Phaseolus vulgaris, c.v. Canadian Wonder)

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Abstract
The levels and distributions of nitrogen, phosphorus, and potassium were followed in the axillary buds and internodes of dwarf bean plants subsequent to decapitation and application of either lanolin or lanolin/IAA to the cut surface of the stem. Nitrogen continued to accumulate in decapitated internodes supplied with IAA for at least 15 days, whereas decapitated internodes not treated with auxin showed only a slight accumulation of nitrogen. The lanolin/IAA preparation also maintained correlative inhibition of the axillary buds for at least 15 days. However, enhanced accumulation of N, P, and K in an IAA-treated internode did not appear to be sufficient to deprive the axillary buds of an adequate supply of these nutrients, for approximate balance sheets showed that more total NPK was accumulated in the internode and axillary buds, taken together, in plants treated with plain lanolin than in those treated with IAA. Furthermore, the total N, P, and K content per unit dry weight of the apical 5 mm of axillary buds was higher in the inhibited buds of IAA-treated plants than in the elongating buds of lanolin-treated plants. Nevertheless, in dwarf bean it was found that an adequate nitrogen supply to the roots favoured lateral bud growth. From these results it would appear that this effect of nitrogen is an indirect one, perhaps influencing the production of substances, such as cytokinins, stimulatory to lateral bud growth.

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