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@inproceedings{896922,
author = {Reková, Alena and Souček, Přemysl and Neumannová, Irena and Brzobohatý, Břetislav},
address = {Brno},
booktitle = {7th International Conference of Ph.D. Students on Experimental Plant Biology},
keywords = {cytokinins; hypocotyl},
language = {eng},
location = {Brno},
isbn = {978-80-7375-310-8},
publisher = {Editorial Center MUAF Brno},
title = {Cytokinin can stimulate Arabidopsis hypocotyl elongation at decreased light intensity},
year = {2009}
}
TY - JOUR
ID - 896922
AU - Reková, Alena - Souček, Přemysl - Neumannová, Irena - Brzobohatý, Břetislav
PY - 2009
TI - Cytokinin can stimulate Arabidopsis hypocotyl elongation at decreased light intensity
PB - Editorial Center MUAF Brno
CY - Brno
SN - 9788073753108
KW - cytokinins
KW - hypocotyl
N2 - 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.
ER -
REKOVÁ, Alena, Přemysl SOUČEK, Irena NEUMANNOVÁ a Břetislav BRZOBOHATÝ. Cytokinin can stimulate Arabidopsis hypocotyl elongation at decreased light intensity. In \textit{7th International Conference of Ph.D. Students on Experimental Plant Biology}. Brno: Editorial Center MUAF Brno, 2009, 1 s. ISBN~978-80-7375-310-8.
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