The Transcription Factors BEL1 and SPL Are Required for Cytokinin and Auxin Signaling During Ovule Development in Arabidopsis

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Authors

BENCIVENGA S. SIMONINI S. FRIMLOVÁ Eva COLOMBO L.

Year of publication 2012
Type Article in Periodical
Magazine / Source Plant Cell
MU Faculty or unit

Central European Institute of Technology

Citation
Doi http://dx.doi.org/10.1105/tpc.112.100164
Field Biochemistry
Keywords WILD-TYPE ARABIDOPSIS; PATTERN-FORMATION; HISTIDINE KINASE; ATP/ADP ISOPENTENYLTRANSFERASES; FEMALE GAMETOPHYTE; EARLY SPOROGENESIS; PROXIMAL-DISTAL; ROOT-MERISTEM; GENE ENCODES; CELL-FATE
Attached files
Description Hormones, such as auxin and cytokinin, are involved in the complex molecular network that regulates the coordinated development of plant organs. Genes controlling ovule patterning have been identified and studied in detail; however, the roles of auxin and cytokinin in ovule development are largely unknown. Here we show that key cytokinin pathway genes, such as isopentenyltransferase and cytokinin receptors, are expressed during ovule development. Also, in a cre1-12 ahk2-2 ahk3-3 triple mutant with severely reduced cytokinin perception, expression of the auxin efflux facilitator PIN-FORMED 1 (PIN1) was severely reduced. In sporocyteless/nozzle (spl/nzz) mutants, which show a similar phenotype to the cre1-12 ahk2-2 ahk3-3 triple mutant, PIN1 expression is also reduced. Treatment with the exogenous cytokinin N-6-benzylaminopurine also altered both auxin distribution and patterning of the ovule; this process required the homeodomain transcription factor BELL1 (BEL1). Thus, this article shows that cytokinin regulates ovule development through the regulation of PIN1. Furthermore, the transcription factors BEL1 and SPL/NZZ, previously described as key regulators of ovule development, are needed for the auxin and cytokinin signaling pathways for the correct patterning of the ovule.
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