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Action of Inhibitor-β on the Growth of Striga Seedlings


THE presence of a growth-inhibitory substance or substances in plant extracts, moving in paper chromatography with ammonical iso-propanol between R F 0.55 and 0.8 was first demonstrated by Bennet-Clark and Kefford1 who suggested the name inhibitor-β. These are now known to occur widely in plant material2,3, and according to Varga and Ferenczy2 the chromatographic behaviour is suggestive of a phenolic acid. Recently Bently4 reported that the inhibitor-β zone from potato peelings contained at least six components (possibly fatty acids) and that inhibition in Avena straight-growth assays was caused by toxicity at greater than normal physiological concentrations; shown by irreversability of the effect and by loss of turgor of the sections. One of these components was shown by Taylor5 to be azelaic acid.

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  1. 1

    Bennet-Clark, T. A., and Kefford, N. P., Nature, 171, 645 (1953).

  2. 2

    Varga, M., and Ferenczy, L., Naturwiss., 44, 398 (1957).

  3. 3

    Ferenczy, L., Phyton, 9, 47 (1957).

  4. 4

    Bently, J., ‘Ann. Rev. Plant Physiology’, 9, 47 (1958).

  5. 5

    Taylor, W. C., Thesis, Univ. Manchester (1956).

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