The AGL6-like gene OsMADS6 regulates floral organ and meristem identities in rice

Li, Haifeng; Liang, Wanqi; Jia, Ruidong; Yin, Changsong; Zong, Jie; Kong, Hongzhi; Zhang, Dabing

doi:10.1038/cr.2009.143

Cited by 141 publications

(158 citation statements)

References 60 publications

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“…OsMADS34/PANICLE PHYTO-MER2 (PAP2) regulates the development of inflorescences and spikelets 39,40 . Emerging evidence suggests that ancient AGAMOUS-LIKE6 (AGL6)-like genes conserved in gymnosperns and angiosperms, such as rice OsMADS6/MOSAIC FLORAL ORGANS1 (MFO1) [53][54][55] and maize zea agamous3 (zag3) 56 , the close homologues of SEP-like genes, have SEP-like functions essential for flower development. In this study, we show a previously unreported JA pathway that regulates the expression of OsMADS1, OsMADS7 and OsMADS8 in rice spikelet development, linking the upstream JA pathway to the floral meristem identity genes (Fig.…”

Section: Discussionmentioning

confidence: 99%

Jasmonic acid regulates spikelet development in rice

et al. 2014

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The spikelet is the basal unit of inflorescence in grasses, and its formation is crucial for reproductive success and cereal yield. Here, we report a previously unknown role of the plant hormone jasmonic acid (JA) in determining rice (Oryza sativa) spikelet morphogenesis. The extra glume 1 (eg1) and eg2 mutants exhibit altered spikelet morphology with changed floral organ identity and number, as well as defective floral meristem determinacy. We show that EG1 is a plastid-targeted lipase that participates in JA biosynthesis, and EG2/OsJAZ1 is a JA signalling repressor that interacts with a putative JA receptor, OsCOI1b, to trigger OsJAZ1's degradation during spikelet development. OsJAZ1 also interacts with OsMYC2, a transcription factor in the JA signalling pathway, and represses OsMYC2's role in activating OsMADS1, an E-class gene crucial to the spikelet development. This work discovers a key regulatory mechanism of grass spikelet development and suggests that the role of JA in reproduction has diversified during the flowering plant evolution.

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Section: Discussionmentioning

confidence: 99%

Jasmonic acid regulates spikelet development in rice

et al. 2014

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“…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%

“…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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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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“…Among the four AG subfamily genes of rice, MADS3, MADS13, and MADS58 regulate also FM determinacy, whereas MADS21 seems not to play important functions during flower development. The MADS domain proteins shown in this model might interact with SEP-like and/or AGL6-like MADS domain proteins providing E-function (Favaro et al, 2002;Kater et al, 2006;Ohmori et al, 2009;Cui et al, 2010;Li et al, 2010;Li et al, 2011a), which for simplicity are not shown in this scheme.…”

Section: The Role Of Ag Subfamily Genes In Ovule Developmentmentioning

confidence: 99%

Functional Analysis of All AGAMOUS Subfamily Members in Rice Reveals Their Roles in Reproductive Organ Identity Determination and Meristem Determinacy

et al. 2011

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Reproductive organ development is one of the most important steps in the life cycle of plants. Studies using core eudicot species like thale cress (Arabidopsis thaliana) and snapdragon (Antirrhinum majus) have shown that MADS domain transcription factors belonging to the AGAMOUS (AG) subfamily regulate the identity of stamens, carpels, and ovules and that they are important for floral meristem determinacy. Here, we investigate the genetic interactions between the four rice (Oryza sativa) AG subfamily members, MADS3, MADS13, MADS21, and MADS58. Our data show that, in contrast with previous reports, MADS3 and MADS58 determine stamen and carpel identity and, together with MADS13, are important for floral meristem determinacy. In the mads3 mads58 double mutant, we observed a complete loss of reproductive organ identity and massive accumulation of lodicules in the third and fourth floral whorls. MADS21 is an AGL11 lineage gene whose expression is not restricted to ovules. Instead, its expression profile is similar to those of class C genes. However, our genetic analysis shows that MADS21 has no function in stamen, carpel, or ovule identity determination.

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The AGL6-like gene OsMADS6 regulates floral organ and meristem identities in rice

Cited by 141 publications

References 60 publications

Jasmonic acid regulates spikelet development in rice

Jasmonic acid regulates spikelet development in rice

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

Functional Analysis of All AGAMOUS Subfamily Members in Rice Reveals Their Roles in Reproductive Organ Identity Determination and Meristem Determinacy

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