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Displaying C2C2-YABBY Family from Rice


Lateral organs produced by shoot apical and flower meristems exhibit a fundamental abaxial-adaxial asymmetry. We describe three members of the YABBY gene family FILAMENTOUS FLOWER YABBY2 and YABBY3 isolated on the basis of homology to CRABS CLAW. Each of these genes is expressed in a polar manner in all lateral organ primordia produced from the apical and flower meristems. The expression of these genes is precisely correlated with abaxial cell fate in mutants in which abaxial cell fates are found ectopically reduced or eliminated. Ectopic expression of either FILAMENTOUS FLOWER or YABBY3 is sufficient to specify the development of ectopic abaxial tissues in lateral organs. Conversely loss of polar expression of these two genes results in a loss of polar differentiation of tissues in lateral organs. Taken together these observations indicate that members of this gene family are responsible for the specification of abaxial cell fate in lateral organs of Arabidopsis. Furthermore ectopic expression studies suggest that ubiquitous abaxial cell fate and maintenance of a functional apical meristem are incompatible.

Protein Name
accepted / suggested
Gene Locus Synonym/
Gene Name
Clone in TFome Genome Browser
OsYAB1 LOC_Os02g42950 View in Browser
OsYAB2 LOC_Os03g11600 View in Browser
OsYAB3 LOC_Os03g44710 View in Browser
OsYAB4 LOC_Os04g45330 View in Browser
OsYAB5 LOC_Os07g06620 View in Browser
OsYAB6 LOC_Os07g38410 View in Browser
OsYAB7 LOC_Os10g36420 View in Browser
OsYAB8 LOC_Os12g42610 View in Browser