Plant Cell Advance Online Publication
Published on March 8, 2002; 10.1105/tpc.010365
Received August 20, 2001
Accepted December 12, 2001
Establishment of Cereal Endosperm Expression Domains: Identification and Properties
of a Maize Transfer Cell--Specific Transcription Factor, ZmMRP-1
Elisa Gómez 1, Joaquín Royo , Yan Guo 1, Richard Thompson 2, and Gregorio Hueros 1*
1
Departamento Biología Celular y Genética, Universidad de Alcalá,
E-28871 Alcalá de Henares, Madrid, Spain
2
Max-Planck-Institute für Züchtungsforschung, Carl-von-Linné Weg
10, 50829 Köln, Germany
* To whom correspondence should be addressed. E-mail: gregorio.hueros{at}uah.es.
In maize, cells at the base of the endosperm are transformed into transfer cells
that facilitate nutrient uptake by the developing seed. ZmMRP-1 is the first
transfer cell--specific transcriptional activator to be identified. The protein
it encodes contains nuclear localization signals and a MYB-related DNA binding domain.
A single gene copy is present in maize, mapping to a locus on chromosome 8. ZmMRP-1
is first expressed soon after fertilization, when the endosperm is still a
multinuclear coenocyte. The transcript accumulates in the basal nucleocytoplasmic
domain that gives rise to transfer cells after cellularization. The transcript can
be detected throughout transfer cell development, but it is not found in mature cells.
ZmMRP-1 strongly transactivates the promoters of two unrelated transfer cell--specific
genes. The properties of ZmMRP-1 are consistent with it being a determinant
of transfer cell--specific expression. Possible roles for ZmMRP-1 in
the regulation of endosperm and transfer cell differentiation are discussed.
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