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Title: Inflorescence Meristem Identity in Rice Is Specified by Overlapping Functions of Three AP1/FUL-Like MADS Box Genes and PAP2 , a SEPALLATA MADS Box Gene .
Author: Kobayashi K Yasuno N Sato Y Yoda M Yamazaki R Kimizu M Yoshida H Nagamura Y Kyozuka J
Journal: Plant Cell Citation: V : 24 P : 1848-59 Year: 2012 Type: In-Data-Review
Literature: oryza Field: abstract Doc ID: pub22570445 Accession (PMID): 22570445
Abstract: In plants , the transition to reproductive growth is of particular importance for successful seed production . Transformation of the shoot apical meristem ( SAM ) to the inflorescence meristem ( IM ) is the crucial first step in this transition . Using laser microdissection and microarrays , we found that expression of PANICLE PHYTOMER2 ( PAP2 ) and three APETALA1 ( AP1 ) /FRUITFULL ( FUL ) -like genes ( MADS14 , MADS15 , and MADS18 ) is induced in the SAM during meristem phase transition in rice ( Oryza sativa ) . PAP2 is a MADS box gene belonging to a grass-specific subclade of the SEPALLATA subfamily . Suppression of these three AP1/FUL-like genes by RNA interference caused a slight delay in reproductive transition . Further depletion of PAP2 function from these triple knockdown plants inhibited the transition of the meristem to the IM . In the quadruple knockdown lines , the meristem continued to generate leaves , rather than becoming an IM . Consequently , multiple shoots were formed instead of an inflorescence . PAP2 physically interacts with MAD14 and MADS15 in vivo . Furthermore , the precocious flowering phenotype caused by the overexpression of Hd3a , a rice florigen gene , was weakened in pap2-1 mutants . Based on these results , we propose that PAP2 and the three AP1/FUL-like genes coordinately act in the meristem to specify the identity of the IM downstream of the florigen signal
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[ Sen. 3, subscore: 1.00 ]: Using laser microdissection and microarrays , we found that expression of PANICLE PHYTOMER2 ( PAP2 ) and three APETALA1 ( AP1 ) /FRUITFULL ( FUL ) -like genes ( MADS14 , MADS15 , and MADS18 ) is induced in the SAM during meristem phase transition in rice ( Oryza sativa ) .
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