Relative Growth Rates of Bean and Oat Plants Containing Known Amounts of a Labeled Plant-Growth Regulator (2-Iodo 131 -3-Nitrobenzoic Acid)

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Abstract
Expts. were done to determine whether the difference in sensitivity of plants, such as bean and oat, to a growth regulator like INBA (2-iodo-3-nitrobenzoic acid) can be explained on the basis of a quantitative difference in their ability to absorb and translocate the compd. By applying radioactive INBA in varying amts. to the older leaves of bean and oat plants and then measuring the radioactivity of the young leaves that later developed, it was possible to compare the rate of growth of the 2 plant types when the young leaves of each contained equal concs, of the growth regulator. Information on the problem was also obtained by studying the translocation of the INBA in corn seedlings. It was found that the difference in sensitivity of bean and oat plants to INBA cannot be explained on a basis of the difference of the extent to which INBA accumulates in the rapidly growing parts or on the basis of differences in the ability of the plants to absorb and translocate the compd. With equal cones, in the young leaves of each type of plant, the growth of bean was greatly reduced but that of oat was not affected.

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