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Rice ABERRANT PANICLE ORGANIZATION 1 , encoding an F‐box protein, regulates meristem fate
Author(s) -
Ikeda Kyoko,
Ito Momoyo,
Nagasawa Nobuhiro,
Kyozuka Junko,
Nagato Yasuo
Publication year - 2007
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/j.1365-313x.2007.03200.x
Subject(s) - meristem , homeotic gene , inflorescence , biology , gene , panicle , mutant , phyllotaxis , arabidopsis , phenotype , genetics , botany
Summary Inflorescence architecture is one of the most important agronomical traits. Characterization of rice aberrant panicle organization 1 ( apo1 ) mutants revealed that APO1 positively controls spikelet number by suppressing the precocious conversion of inflorescence meristems to spikelet meristems. In addition, APO1 is associated with the regulation of the plastchron, floral organ identity, and floral determinacy. Phenotypic analyses of apo1 and floral homeotic double mutants demonstrate that APO1 positively regulates class‐C floral homeotic genes, but not class‐B genes. Molecular studies revealed that APO1 encodes an F‐box protein, an ortholog of Arabidopsis UNUSUAL FLORAL ORGAN ( UFO ), which is a positive regulator of class‐B genes. Overexpression of APO1 caused an increase in inflorescence branches and spikelets. As the mutant inflorescences and flowers differed considerably between apo1 and ufo, the functions of APO1 and UFO appear to have diverged during evolution.