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Epiphytic, IAA-producing bacteria strains were fed with 14C-tryptophan (Try). 14C-Try absorption and, after transfer to a Try-free medium, 14C-IAA output were stated. Using 4 different methods, the 14C-Try containing bacteria were applied to the tips of sterile corn coleoptiles and the ‘diffusible’ auxin collected at the coleoptile bases by means of agar blocks. 14C-IAA was detected in the agar blocks. Sterile coleoptiles the tips of which were wupplied with 14C-Try also deliver some 14C-IAA at their bases, but much less than both sterile coleoptiles supplied with 14C-Try-containing bacteria and nonsterile supplied with 14C-Try. 相似文献
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