phytohormonen.
/ˈfʌɪtəʊhɔːməʊn/, /ˌfʌɪtəʊˈhɔːməʊn/, U.S. /ˌfaɪdoʊˈhɔrˌmoʊn/, /ˌfaɪdəˈhɔrˌmoʊn/ Botany.
A hormone produced by a plant; = hormone n. 2.
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the world > life > biology > substance > process stimulators or inhibitors > hormone > [noun] > in plants
hormone1911
wound hormone1921
plant hormone1932
phytohormone1933
auxin1934
heteroauxin1935
florigen1936
traumatic acid1939
abscisin1961
zeatin1963
cytokinin1965
antheridiol1967
abscisic acid1968
oogoniol1975
1933 Chem. Abstr. 27 1645 (heading) Vegetable growth substances... A phytohormone of cell extension.
1940 W. R. Fearon Introd. Biochem. (ed. 2) xxiv. 446 The effect of the phytohormones is non-specific as regards species.
1959 L. J. Audus Plant Growth Substances (ed. 2) i. 16 In the past a rigid distinction has been made between..‘synthetic growth-regulating substances’ and ‘natural phytohormones’.
1971 Nature 4 June 332/1 Jump suggested that a phytohormone produced by A[ureobasidium] pullulans (Dematium pullulans) may have been responsible for forking in red pine.
1990 Org. Gardening Nov. 52/2 Apparently, the phytohormones auxin, cytokinin and gibberellin in kelp products such as SeaMix, Sea Crop and FoliaGro stimulate the increased yields.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1933