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In vitro studies of IAA-induced cell elongation in Triticum aestivum have demonstrated that lead causes a large reduction in elongation. Inhibition of elongation can be reduced by increasing the concentration of IAA, or by the addition of calcium. The inhibitory effect appears to be linked with changes in the properties of the cell walls. Experiments are described which show that lead becomes bound strongly to certain chemical substances involved in cell wall architecture.

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SUMMARYApplication of gibberellic acid (GA3) to isolated petals of carnation growing in agar or a liquid medium resulted in a delay in senescence by up to 4 days. Sucrose and 8‐hydroxy‐quinoline sulphate were also effective in delaying senescence but combined effects with GA3 were not additive.