340 D. ]. Osborne and M. HaUaway 



the 2,4-D-treated areas after 1 1 days. The leaf seems to be uniformly 

 labeled. 



Dr. Freed: ^Vell, 2,4-D applied to a plant apparently inhibits phos- 

 phate uptake, but the endogenous phosphate accumulates in the areas 

 with 2,4-D largely because of the stimulated respiration. 



Dr. Wittwer: A number of years ago, we studied the effect of di- 

 ethyl ether on the movement of calcium in the bean plant, then fol- 

 lowed this with work on the effects of growth substances that sus- 

 pended polarity. We found that in line with the results just men- 

 tioned by Dr. Osborne, there are a number of mineral nutrients that 

 are altered in their transport and distribution in the plant following 

 the application of such growth substances as 2,3,5-triiodobenzoic acid, 

 1-naphthaleneacetic acid, and maleic hydrazide. Samish (Plant Analy- 

 sis and Fertilizer Problems, pp. 156-165 [Institute de Recherches pour 

 les Huiles et Oleagineaux, Paris, France, 263 pp. ], 1954) and Kessler 

 and Moscicki (Plant Physiol., 33: 70. 1958) both reported a greening 

 up of chlorotic foliage following treatment with growth substances. 

 Maleic hydrazide, 1-naphthaleneacetic acid, and 2,3,5-triiodobenzoic 

 acid have promoted the movement and transport of iron and calcium 

 in tissues where otherwise it would not occur. 



