The Rate of Transport of Natural Auxin in Woody Shoots

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Abstract
A method is described for the estimation of the rate of movement and the quantity transported of the natural growth hormone in standard isolated segments of apple shoots. During controlled storage diffusible auxin is collected, and later by dividing the standard length of stem into small sections the location of the auxin front is determined, from which the rate of transport is deduced. Temperature markedly affects both rate of transport and amount of auxin transported (cf. van der Weij, 1932), a maximum occurring at 27–30° C.; followed by a rapid fall to zero. The total diffusible auxin in a given length of stem is not affected by storage temperatures below 30° C. but falls to zero at 42° C. The rate of transport and amount transported are proportional to the oxygen tension over the range 0 to 5 per cent. O2, and there is some evidence for destruction of auxin in tensions below 2 per cent.

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