By Kenneth V. Thimann
The motion of Hormones in crops and invertebrates
summary: The motion of Hormones in vegetation and invertebrates
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Additional info for The Action of Hormones in Plants and Invertebrates
In general the tall, rapidly growing single-shoot type of plant, which presumably produces and transports auxin efficiently, has few lateral branches, while shorter dwarf or stunted forms typically become bushy with numerous laterals or tillers. Auxin relations of this sort have been studied by van Overbeek (227,230) and Delisle (73) but much still remains to be done. Young leaves, since they are potent sources of auxin, exert a powerful inhibition (279) but mature leaves also inhibit in some plants (80).
A peculiar and unexplained fact is recorded by Castan (57), namely, that, if high auxin concentration is applied to the intact terminal bud, it loses its power of inhibiting the lateral buds below it. The problem is made more complicated by the direction in which inhibition is exerted. , basal to, the source of auxin. Although this in general is strictly the case, there are exceptions in which buds are inhibited above the point of auxin application (283,285), and a parallel has been suggested with certain upward inhibitions of stem elongation, studied by Pohl (243), Le Fanu (190), and Mitchell and Martin (204).
Auxin relations of this sort have been studied by van Overbeek (227,230) and Delisle (73) but much still remains to be done. Young leaves, since they are potent sources of auxin, exert a powerful inhibition (279) but mature leaves also inhibit in some plants (80). In guayule, a desert composite grown for its rubber content, the mature leaves actually inhibit the buds in their axils more powerfully than does the terminal bud (277). Indeed, a single leaf can inhibit the lateral buds all the way down the stem, a most unusual behav- PLANT GROWTH HORMONES 39 ior, which may well repay closer study.