Hormone-mediated nitrogen signaling in plants: implication of participation of abscissic acid in negative regulation of cytokinin-inducible expression of maize response regulator

In addition to nitrate ion itself, plant growth regulators such as cytokinin function to communicate nitrogen availability between organs. The cytokinin-mediated nitrogen signal is transmitted by a His-Asp phosphorelay system in the target cells. Although mutual crosstalk among the growth regulators...

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Bibliographic Details
Published in:Plant physiology and biochemistry 2003-06, Vol.41 (6), p.605-610
Main Authors: Gawronska, Helena, Deji, Atsushi, Sakakibara, Hitoshi, Sugiyama, Tatsuo
Format: Article
Language:English
Subjects:
ABA
Abscissic acid
AZOTE
CITOQUININAS
Cytokinin
CYTOKININE
CYTOKININS
EXPRESIÓN GÉNICA
EXPRESSION DES GÈNES
GENE EXPRESSION
NITROGEN
Nitrogen availability
NITRÓGENO
Response regulator
SAP
SAVIA
SÈVE
XILEMA
XYLEM
Xylem sap
XYLÈME
ZEA MAYS
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Summary:In addition to nitrate ion itself, plant growth regulators such as cytokinin function to communicate nitrogen availability between organs. The cytokinin-mediated nitrogen signal is transmitted by a His-Asp phosphorelay system in the target cells. Although mutual crosstalk among the growth regulators in various aspects has been reported, the effect of other hormones on the cytokinin-mediated nitrogen signaling has not been characterized well. In maize ( Zea mays L.), abscissic acid (ABA) concentration in tissue is affected by nitrogen availability: it is remarkably higher in the aged leaves than younger leaves under a nitrogen-limited condition, whereas the tendency is reversed in a sufficient condition. The delivery rate of ABA from root to shoot via xylem is also increased under a nitrogen-limited cultivation. These profiles of ABA are reciprocal to those of cytokinin. Cytokinin-dependent induction of ZmRR 1 and ZmRR 2, response regulators, is repressed by co-treatment with ABA in a dose-dependent manner. These results imply that ABA participates in cytokinin-mediated nitrogen signaling by means of negative regulation of ZmRRs.
ISSN:0981-9428
1873-2690
DOI:10.1016/S0981-9428(03)00059-7