Abstract:
:The spatial coordination of growth is of central importance for the regulation of plant tissue architecture. Individual layers, such as the epidermis, are clonally propagated and structurally maintained by symmetric cell divisions that are oriented along the plane of the layer. The developmental control of this process is poorly understood. The simple cellular basis and sheet-like structure of Arabidopsis integuments make them an attractive model system to address planar growth. Here we report on the characterization of the Arabidopsis UNICORN (UCN) gene. Analysis of ucn integuments reveals localized distortion of planar growth, eventually resulting in an ectopic multicellular protrusion. In addition, ucn mutants exhibit ectopic growth in filaments and petals, as well as aberrant embryogenesis. We further show that UCN encodes an active AGC VIII kinase. Genetic, biochemical, and cell biological data suggest that UCN suppresses ectopic growth in integuments by directly repressing the KANADI transcription factor ABERRANT TESTA SHAPE. Our findings indicate that UCN represents a unique plant growth regulator that maintains planar growth of integuments by repressing a developmental regulator involved in the control of early integument growth and polarity.
journal_name
Proc Natl Acad Sci U S Aauthors
Enugutti B,Kirchhelle C,Oelschner M,Torres Ruiz RA,Schliebner I,Leister D,Schneitz Kdoi
10.1073/pnas.1205089109subject
Has Abstractpub_date
2012-09-11 00:00:00pages
15060-5issue
37eissn
0027-8424issn
1091-6490pii
1205089109journal_volume
109pub_type
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