Abstract
The interaction between exogenous 2-chloroethylphosphonic acid (Ethrel, CEPA) and auxin (both native and synthetic—IAA) was studied on pea and bean seedlings, potato tubers, and processed flax plants. After the addition of ethrel the inhibiting effect of IAA was decreased in all objects and it was found that the concentration of the growth of the regulators played an important role. The growth response of a part of flax hypocotyl, as induced by exogenous auxin produced in the cotyledon, was reversed by ethrel, too. The application of ethrel on the epicotyl apex in beans resulted in the lost of apical dominance of epicotyl and in the growth of lateral buds together with the epicotyl. When stimulating the growth, ethrel reverses the inhibitions through the decrease in the auxin content (from an inhibiting, supraoptimum level to an optimum one which already stimulates growth). In objects with a low content of endogenous auxin the ethrel induced the decrease in the auxin content and shows an inhibiting effect on growth.
Abstract
Interakce mezi exogenně aplikovanou kyselinou 2-chlorethylfosfonovou (Ethrel, CEPA) a auxinem at již nativním, nebo syntetickým (IAA) byla studována na klíčících rostlinách hrachu a fazolu, na hlízách bramboru a částech rostlin lnu. Inhibiční účinek IAA byl snižován u všech objektů přídavkem ethrelu, přičemž významnou roli zde hraje koncentrace používaných r⫲stových regulátorů. Také růstová reakce části hypokotylu lnu indukovaná endogenním auxinem produkovaným dělohou byla ethrelem zrušena. Aplikace ethrelu na vreholek epikotylu fazolu vedla ke ztrátě apikální dominance epikotylu a růstu postranních pupenů za současné existence epikotylu.
Tam, kde ethrel vykazuje stimulační účinek na růst, ruší inhibice tím, že snižuje obsah auxinu z inhibiční supraoptimální hladiny na hladinu optimální, která již podněcuje růst. U objektů, které obsahují málo endogenního auxinu působí snížení obsahu nativního auxinu na růst inhibičně.
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Dedicated to the commemoration of Professor PhDr. Dr.h.c. Rudolf Dostál, DrSc.
Address: Zemědělská 1, 662 65 Brno, Czechoslovakia.
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Hradilík, J. Reversal of auxin induced inhibition by ethrel. Biol Plant 16, 255–261 (1974). https://doi.org/10.1007/BF02921235
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DOI: https://doi.org/10.1007/BF02921235