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Studies on plant growth‐regulating substances: XXXV. Ethylene production by coleoptiles treated with auxin‐type chemicals
Author(s) -
GOLDWIN G. K.,
WAIN R. L.
Publication year - 1973
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1973.tb01339.x
Subject(s) - coleoptile , auxin , ethylene , elongation , biology , plant growth , botany , biochemistry , materials science , catalysis , ultimate tensile strength , metallurgy , gene
SUMMARY Wheat coleoptile sections were treated with a range of auxins and with compounds of related chemical structure which do not exhibit auxin properties. Methods used for measuring the rates of elongation and ethylene evolution of these sections are described. Ethylene was evolved some time after elongation in all cases and increased ethylene production occurred only with compounds showing auxin activity. The results indicate that ethylene evolution was related exponentially to growth. Simultaneous applications of mannitol and 2, 4‐dichloro‐phenoxyacetic acid (2, 4‐D) to wheat sections markedly reduced ethylene evolution compared with the 2, 4‐D controls, even though the level of 2, 4‐D in the tissue apparently remained unchanged. Ethylene significantly inhibited the elongation of wheat coleoptile sections, and it is suggested that ethylene is a natural plant growth inhibitor which becomes mobilised to limit excessive growth.