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Title: MOSAIC FLORAL ORGANS1 , an AGL6-like MADS box gene , regulates floral organ identity and meristem fate in rice .
Author: Ohmori S Kimizu M Sugita M Miyao A Hirochika H Uchida E Nagato Y Yoshida H
Journal: Plant Cell Citation: V : 21 P : 3008-25 Year: 2009 Type: In-Process
Literature: oryza Field: abstract Doc ID: pub19820190 Accession (PMID): 19820190
Abstract: Floral organ identity and meristem determinacy in plants are controlled by combinations of activities mediated by MADS box genes . AGAMOUS-LIKE6 ( AGL6 ) -like genes are MADS box genes expressed in floral it issues , but their biological functions are mostly unknown . Here , we describe an AGL6-like gene in rice ( Oryza sativa ) , MOSAIC FLORAL ORGANS1 ( MFO1/MADS6 ) , that regulates floral organ identity and floral meristem determinacy . In the flower of mfo1 mutants , the identities of palea and lodicule are disturbed , and mosaic organs were observed . Furthermore , the determinacy of the floral meristem was lost , and extra carpels or spikelets developed in mfo1 florets . The expression patterns of floral MADS box genes were disturbed in the mutant florets . Suppression of another rice AGL6-like gene , MADS17 , caused no morphological abnormalities in the wild-type background , but it enhanced the phenotype in the mfo1 background , indicating that MADS17 has a minor but redundant function with that of MFO1 . Whereas single mutants in either MFO1 or the SEPALLATA-like gene LHS1 showed moderate phenotypes , the mfo1 lhs1 double mutant showed a severe phenotype , including the loss of spikelet meristem determinacy . We propose that rice AGL6-like genes help to control floral organ identity and the establishment and determinacy of the floral meristem redundantly with LHS1 .
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[ Sen. 7, subscore: 2.00 ]: Suppression of another rice AGL6-like gene , MADS17 , caused no morphological abnormalities in the wild-type background , but it enhanced the phenotype in the mfo1 background , indicating that MADS17 has a minor but redundant function with that of MFO1 .
[ Sen. 8, subscore: 2.00 ]: Whereas single mutants in either MFO1 or the SEPALLATA-like gene LHS1 showed moderate phenotypes , the mfo1 lhs1 double mutant showed a severe phenotype , including the loss of spikelet meristem determinacy .
[ Sen. 4, subscore: 1.00 ]: In the flower of mfo1 mutants , the identities of palea and lodicule are disturbed , and mosaic organs were observed .
[ Sen. 5, subscore: 1.00 ]: Furthermore , the determinacy of the floral meristem was lost , and extra carpels or spikelets developed in mfo1 florets .
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