<i>MOSAIC FLORAL ORGANS1</i>, an<i>AGL6</i>-Like MADS Box Gene, Regulates Floral Organ Identity and Meristem Fate in Rice

Ohmori, Shinnosuke; Kimizu, Mayumi; Sugita, Maiko; Miyao, Akio; Hirochika, Hirohiko; Uchida, Eiji; Nagato, Yasuo; Yoshida, Hitoshi

doi:10.1105/tpc.109.068742

Cited by 194 publications

(247 citation statements)

References 64 publications

(93 reference statements)

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“…At slightly later developmental stages, OsMADS6 could participate in activating class B, C, and E (OsMADS7 and OsMADS8) floret organ identity genes. This postulate is consistent with their reduced expression in osmads6 mutants and with the expression domain of OsMADS6 in FMs, palea, lodicule, and carpel primordia (Ohmori et al, 2009;Li et al, 2011a;Supplemental Fig. S8).…”

Section: Interactions Among Mads Factors During Floret Organogenesis supporting

confidence: 69%

“…Genetic and physical interactions of OsMADS1 suggest that in promoting FM identity, it acts in conjunction with a SEP sister clade (AGL6-like) member, MOSAIC FLORAL ORGANS1/OsMADS6 (Ohmori et al, 2009;Li et al, 2010), and with OsMADS15/DEP, an APETALA1/FRUITFULL-like homolog (Supplemental Fig. S8).…”

Section: Osmads1 Promotes Fm Identity and Its Maintenancementioning

confidence: 99%

“…OsMADS1, OsMADS6, other SEP genes, and class C and D genes (OsMADS3, OsMADS58, OsMADS13, OsMADS21, OsMADS7, and OsMADS8) contribute to rice FM termination (Yamaguchi et al, 2006;Ohmori et al, 2009;Li et al, 2010Li et al, , 2011aSupplemental Fig. S8).…”

Section: Interactions Among Mads Factors During Floret Organogenesis mentioning

confidence: 99%

“…Mutants in these factors share the phenotype of abnormal extra carpels ( Fig. 2D; Yamaguchi et al, 2006;Dreni et al, 2007;Ohmori et al, 2009;Cui et al, 2010). Protein interactions of OsMADS1 with OsMADS13 (a class D gene), OsMADS7, and OsMADS8 (Favaro et al, 2002;Cui et al, 2010) and its genetic interactions with OsMADS6, OsMADS3, OsMADS58, and OsMADS13 (Dreni et al, 2011;Li et al, 2011aLi et al, , 2011bSupplemental Fig.…”

Section: Interactions Among Mads Factors During Floret Organogenesis mentioning

confidence: 99%

“…They contribute to panicle morphology, spikelet and FM specification, floral organ differentiation, and meristem determinacy (Jeon et al, 2000;Prasad et al, 2005;Cui et al, 2010;Gao et al, 2010;Kobayashi et al, 2010). Rice LEAFY HULL STERILE (LHS1)/OsMADS1, a member of the grass subgroup of LOFSEP genes, referred to henceforth as OsMADS1, is expressed in FMs, functions during FM establishment and floret organ patterning, and contributes to meristem termination (Jeon et al, 2000;Prasad et al, 2001Prasad et al, , 2005Agrawal et al, 2005;Ohmori et al, 2009;Cui et al, 2010;Gao et al, 2010;Li et al, 2010;Wang et al, 2010). In addition to studies on mutants in rice SEP factors, their protein-protein interactions are reported from yeast two-hybrid analyses.…”

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confidence: 99%

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RiceLHS1/OsMADS1Controls Floret Meristem Specification by Coordinated Regulation of Transcription Factors and Hormone Signaling Pathways

2013

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SEPALLATA (SEP) MADS box transcription factors mediate floral development in association with other regulators. Mutants in five rice (Oryza sativa) SEP genes suggest both redundant and unique functions in panicle branching and floret development. LEAFY HULL STERILE1/OsMADS1, from a grass-specific subgroup of LOFSEP genes, is required for specifying a single floret on the spikelet meristem and for floret organ development, but its downstream mechanisms are unknown. Here, key pathways and directly modulated targets of OsMADS1 were deduced from expression analysis after its knockdown and induction in developing florets and by studying its chromatin occupancy at downstream genes. The negative regulation of OsMADS34, another LOFSEP gene, and activation of OsMADS55, a SHORT VEGETATIVE PHASE-like floret meristem identity gene, show its role in facilitating the spikelet-to-floret meristem transition. Direct regulation of other transcription factor genes like OsHB4 (a class III homeodomain Leu zipper member), OsBLH1 (a BEL1-like homeodomain member), OsKANADI2, OsKANADI4, and OsETTIN2 show its role in meristem maintenance, determinacy, and lateral organ development. We found that the OsMADS1 targets OsETTIN1 and OsETTIN2 redundantly ensure carpel differentiation. The multiple effects of OsMADS1 in promoting auxin transport, signaling, and auxin-dependent expression and its direct repression of three cytokinin A-type response regulators show its role in balancing meristem growth, lateral organ differentiation, and determinacy. Overall, we show that OsMADS1 integrates transcriptional and signaling pathways to promote rice floret specification and development.Patterning an angiosperm flower requires the combined and individual functions of class A, B, C, D, and E MADS box transcription factors (Krizek and Fletcher, 2005;Thompson and Hake, 2009). In Arabidopsis (Arabidopsis thaliana), the class E activity is conferred by four redundant proteins, SEPALLATA1 (SEP1), SEP2, SEP3, and SEP4, that are cofactors in complexes with other MADS box factors that determine floral organ identities and meristem determinacy (Pelaz et al., 2000). Studies on loss-and gain-of-function mutants in SEP genes together with protein interaction analyses point to their pivotal role in mediating interactions among other floral organ-patterning genes (Honma and Goto, 2001;Ditta et al., 2004;Immink et al., 2009). The largely shared functions of Arabidopsis SEP genes differ from observations that homologs in other plants often have discrete roles in floral development (Malcomber and Kellogg, 2005), but the molecular mechanism underlying their species-specific roles is not well studied. In addition to the ABCDE class of organ fate regulators, a number of hormone signaling pathways influence floral transition, organ numbers, fertility, and floral meristem (FM) determinacy. Dynamic interactions are reported between transcription factors and specific hormone signaling factors during the establishment of Arabidopsis FMs (Sessions et al., 1997;Leibfried et al., ...

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Section: Interactions Among Mads Factors During Floret Organogenesis supporting

confidence: 69%

Section: Osmads1 Promotes Fm Identity and Its Maintenancementioning

confidence: 99%

Section: Interactions Among Mads Factors During Floret Organogenesis mentioning

confidence: 99%

Section: Interactions Among Mads Factors During Floret Organogenesis mentioning

confidence: 99%

mentioning

confidence: 99%

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RiceLHS1/OsMADS1Controls Floret Meristem Specification by Coordinated Regulation of Transcription Factors and Hormone Signaling Pathways

2013

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Cereal Architecture and Its Manipulation

Dixon

Esse

Hirsz

et al. 2022

Annual Plant Reviews Online

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Our lives depend on an incredibly small number of cereal species whose grain provides more calories to our diet than any other source. The extraordinary productivity of cultivated cereals reflects millennia of selection, recent directed breeding, and modern agricultural practices. Here, we examine selected architectural and agronomic features of major cereal body parts: leaf, branch, inflorescence, stem, and root; and discuss how their manipulation enhanced crop performance. Highlighting synergistic research across laboratory models and field‐based systems, we consider how diversified molecular circuitry, novel regulators and conserved components of genetic, hormonal, and molecular mechanisms control cereal architecture. Lastly, we emphasise the agricultural importance of developmental decisions during cereal growth and propose future perspectives for robust architectural improvement, made ever more urgent by our accelerating climate crisis.

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A multi‐level approach reveals key physiological and molecular traits in the response of two rice genotypes subjected to water deficit at the reproductive stage

Favreau,

Gaal,

Pereira de Lima

et al. 2023

Plant Enviro Interactions

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Rice is more vulnerable to drought than maize, wheat, and sorghum because its water requirements remain high throughout the rice life cycle. The effects of drought vary depending on the timing, intensity, and duration of the events, as well as on the rice genotype and developmental stage. It can affect all levels of organization, from genes to the cells, tissues, and/or organs. In this study, a moderate water deficit was applied to two contrasting rice genotypes, IAC 25 and CIRAD 409, during their reproductive stage. Multi‐level transcriptomic, metabolomic, physiological, and morphological analyses were performed to investigate the complex traits involved in their response to drought. Weighted gene network correlation analysis was used to identify the specific molecular mechanisms regulated by each genotype, and the correlations between gene networks and phenotypic traits. A holistic analysis of all the data provided a deeper understanding of the specific mechanisms regulated by each genotype, and enabled the identification of gene markers. Under non‐limiting water conditions, CIRAD 409 had a denser shoot, but shoot growth was slower despite better photosynthetic performance. Under water deficit, CIRAD 409 was weakly affected regardless of the plant level analyzed. In contrast, IAC 25 had reduced growth and reproductive development. It regulated transcriptomic and metabolic activities at a high level, and activated a complex gene regulatory network involved in growth‐limiting processes. By comparing two contrasting genotypes, the present study identified the regulation of some fundamental processes and gene markers, that drive rice development, and influence its response to water deficit, in particular, the importance of the biosynthetic and regulatory pathways for cell wall metabolism. These key processes determine the biological and mechanical properties of the cell wall and thus influence plant development, organ expansion, and turgor maintenance under water deficit. Our results also question the genericity of the antagonism between morphogenesis and organogenesis observed in the two genotypes.

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MOSAIC FLORAL ORGANS1, anAGL6-Like MADS Box Gene, Regulates Floral Organ Identity and Meristem Fate in Rice

Cited by 194 publications

References 64 publications

RiceLHS1/OsMADS1Controls Floret Meristem Specification by Coordinated Regulation of Transcription Factors and Hormone Signaling Pathways

RiceLHS1/OsMADS1Controls Floret Meristem Specification by Coordinated Regulation of Transcription Factors and Hormone Signaling Pathways

Cereal Architecture and Its Manipulation

A multi‐level approach reveals key physiological and molecular traits in the response of two rice genotypes subjected to water deficit at the reproductive stage

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