Cytokinin can stimulate Arabidopsis hypocotyl elongation at decreased light intensity

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Publikace nespadá pod Filozofickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
Název česky Cytokininy mohou stimulovat elongaci hypokotylů Arabidopsis při snížené světelné intenzitě
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REKOVÁ Alena SOUČEK Přemysl NEUMANNOVÁ Irena BRZOBOHATÝ Břetislav

Rok publikování 2009
Druh Článek ve sborníku
Konference 7th International Conference of Ph.D. Students on Experimental Plant Biology
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Obor Genetika a molekulární biologie
Klíčová slova cytokinins; hypocotyl
Popis Cytokinins (CKs) were reported not to affect hypocotyl elongation in Arabidopsis seedlings grown in the light, and CK reportedly promoted hypocotyl elongation in the white light when ethylene action or auxin transport was blocked. Here we re-investigated the effects of CKs on hypocotyl elongation in Arabidopsis. While only a marginal effect of CKs on hypocotyl length was observed at a standard white light intensity (80 umol m-2 s-1), a pronounced stimulation of hypocotyl elongation by CKs was found when the seedlings were cultivated at a decreased white light intensity (20 umol m-2 s-1). The CK effect on hypocotyl length was due to cell elongation. The stimulation of hypocotyl elongation was observed for all four principal CKs (t-Z, iP, BA, TDZ) and was dose-dependent in the nanomolar range. The stimulatory effect of the CKs was antagonized by PI-55. Mutant and transgenic plant analysis indicated that the canonical two-component response pathway is necessary for this process with prevailing contribution of AHK2 and AHK3 receptors. This CK action was independent of ethylene signaling and partially inhibited by IAA.
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