Abstract
Brown, C. L. (Forest Genetics Laboratory, College Station, Texas.), and Ralph H. Wetmore. Auxin transport in the long shoots of pine. Amer. Jour. Bot. 46(8): 586–590. 1959.—Data are presented which show that endogenous auxin in the stem segments of pine is actively transported under extremely low oxygen tension and in amounts equal to that in the normally aerated controls. In distinct contrast, stem segments, previously evacuated of endogenous auxin, which readily transport IAA applied in donor blocks at physiological concentrations in air, do not do so in an atmosphere of pure nitrogen. It is concluded that it is the initial phase, the uptake of IAA from the block into the tissue, which is limiting at low oxygen tension, while the second phase, the transport sensu stricto, is almost independent of oxygen.
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