The Genetic Control of the Compound Leaf Patterning in Medicago truncatula

Mo, Xiaoyu; He, Liangliang; Liu, Ye; Wang, Dongfa; Zhao, Baolin; Chen, Jianghua

doi:10.3389/fpls.2021.749989

Cited by 7 publications

(4 citation statements)

References 133 publications

(210 reference statements)

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“…Along the same line, in some legumes species, UFO promotes the development of compound leaves: in pea, the stp mutant has simple leaves instead of compound and the lotus pfo mutant has leaves with a reduced number of leaflets (Taylor et al ., 2001; Dong et al ., 2005). Since leaflet development requires the reactivation of meristematic genes within the leaf primordia (Mo et al ., 2022), it shows that UFO in some legumes is needed for this reactivation. Altogether, such evidence suggests that UFO is able to stimulate cell proliferation and/or the establishment of meristem traits in some plant species.…”

Section: Ufo Regulates Diverse Developmental Stepsmentioning

confidence: 92%

Thinking outside the F‐box: how UFO controls angiosperm development

Rieu,

Arnoux‐Courseaux,

Tichtinsky

et al. 2023

New Phytologist

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SummaryThe formation of inflorescences and flowers is essential for the successful reproduction of angiosperms. In the past few decades, genetic studies have identified the LEAFY transcription factor and the UNUSUAL FLORAL ORGANS (UFO) F‐box protein as two major regulators of flower development in a broad range of angiosperm species. Recent research has revealed that UFO acts as a transcriptional cofactor, redirecting the LEAFY floral regulator to novel cis‐elements. In this review, we summarize the various roles of UFO across species, analyze past results in light of new discoveries and highlight the key questions that remain to be solved.

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Section: Ufo Regulates Diverse Developmental Stepsmentioning

confidence: 92%

Thinking outside the F‐box: how UFO controls angiosperm development

Rieu,

Arnoux‐Courseaux,

Tichtinsky

et al. 2023

New Phytologist

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“…In wild type M. truncatula, Mtnoot1, Mtnoot2 and Mtnoot1noot2 mutant backgrounds, leaves are trifoliolate and indistinguishable from wild type suggesting that these genes do not participate in M. truncatula leaf development (Fig. 3A-D; Mo et al, 2022).…”

Section: Nbcl Genes Are Involved In P Sativum Leaf Development But No...mentioning

confidence: 99%

The transcriptional co-regulators NBCL1 and NBCL2 redundantly coordinate aerial organ development and root nodule identity in legumes

Liu

Magne

Zhou

et al. 2022

Journal of Experimental Botany

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Medicago truncatula NODULE ROOT1 (MtNOOT1) and Pisum sativum COCHLEATA1 (PsCOCH1) are orthologous genes belonging to the NOOT-BOP-COCH-LIKE (NBCL) gene family which encodes key transcriptional co-regulators of plant development. In Mtnoot1 and Pscoch1 mutants, the development of stipule, flower and symbiotic nodules is altered. MtNOOT2 and PsCOCH2 represent the single paralogs of MtNOOT1 and PsCOCH1, respectively. In M. truncatula, MtNOOT1 and MtNOOT2 are both required for the establishment and maintenance of the symbiotic nodule identity. In contrast to the NBCL1 genes, the role of NBCL2 genes in legume above-ground development is not known. To better understand the roles of NBCL genes in legumes, we used M. truncatula and P. sativum nbcl mutants from the literature, isolated a knockout mutant for the PsCOCH2 locus and generated Pscoch1coch2 double mutants in P. sativum. These new mutant lines enabled to compare the roles of MtNOOT2 and PsCOCH2 in both M. truncatula and P. sativum legume development. Our work shows that the single Mtnoot2 and Pscoch2 mutants develop wild-type stipules, flowers and symbiotic nodules. However, the number of flowers was increased and the pods and seeds were smaller in comparison to wild type. Furthermore, in comparison to the corresponding nbcl1 single mutants, both the M. truncatula and P. sativum nbcl double mutants show a drastic alteration in stipule, inflorescence, flower and nodule development. Remarkably, in both M. truncatula and P. sativum nbcl double mutants, stipules are transformed into a range of aberrant leaf-like structures.

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“…Compound leaves are initiated as simple peg-like primordia at the flanks of the shoot apical meristem (SAM), which then undergo a series of coordinated morphogenetic events to develop into a complex structure of multiple separate leaflet primordia. The two most critical events are the leaflet initiation and boundary formation between leaflets, which are regulated by different pathways ( Efroni et al 2010 ; Bar and Ori 2015 ; Mo et al 2022 ). The initiation of leaflet primordia from the lateral margins of the primary simple primordium depends on the maintenance of transient morphogenetic activity within the primordium.…”

Section: Introductionmentioning

confidence: 99%

“…Our previous works in M. truncatula have proposed a regulatory network controlling leaflet initiation, in which the LFY ortholog SINGLE LEAFLET1 (SGL1) maintains the leaf morphogenetic activity and promotes the lateral leaflet initiation, while the BEL1-like homeodomain (BLH) protein PINNATE-LIKE PENTAFOLIATA1 (PINNA1) and C2H2 zinc finger protein PALMATE-LIKE PENTAFOLIATA1 (PALM1) synergistically and negatively regulate the relevant morphogenetic activity by directly binding to the promoter of SGL1 to repress its transcription ( Wang et al 2008 ; Chen et al 2010 ; He et al 2020 ; Mo et al 2022 ). Here, we isolated another leaf-pattern mutant pinna2-1 which phenotypically resembled the pinna1 mutants.…”

Section: Introductionmentioning

confidence: 99%

GRAS transcription factor PINNATE-LIKE PENTAFOLIATA2 controls compound leaf morphogenesis in Medicago truncatula

He,

Liu,

Mao

et al. 2024

The Plant Cell

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The milestone of compound leaf development is the generation of separate leaflet primordia during the early stages, which involves two linked but distinct morphogenetic events: leaflet initiation and boundary establishment for leaflet separation. Although some progress in understanding the regulatory pathways for each event have been made, it is unclear how they are intrinsically coordinated. Here, we identify the PINNATE-LIKE PENTAFOLIATA2 (PINNA2) gene encoding a newly identified GRAS transcription factor in Medicago truncatula. PINNA2 transcripts are preferentially detected at organ boundaries. Its loss-of-function mutations convert trifoliate leaves into a pinnate pentafoliate pattern. PINNA2 directly binds to the promoter region of the LEAFY orthologue SINGLE LEAFLET1 (SGL1), which encodes a key positive regulator of leaflet initiation, and down-regulates its expression. Further analysis revealed that PINNA2 synergizes with two other repressors of SGL1 expression, the BEL1-like homeodomain protein PINNA1 and the C2H2 zinc finger protein PALMATE-LIKE PENTAFOLIATA1 (PALM1), to precisely define the spatiotemporal expression of SGL1 in compound leaf primordia, thereby maintaining a proper pattern of leaflet initiation. Moreover, we showed that the enriched expression of PINNA2 at the leaflet-to-leaflet boundaries is positively regulated by the boundary-specific gene MtNAM, which is essential for leaflet boundary formation. Together, these results unveil a pivotal role of the boundary-expressed transcription factor PINNA2 in regulating leaflet initiation, providing molecular insights into the coordination of intricate developmental processes underlying compound leaf pattern formation.

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The Genetic Control of the Compound Leaf Patterning in Medicago truncatula

Cited by 7 publications

References 133 publications

Thinking outside the F‐box: how UFO controls angiosperm development

Thinking outside the F‐box: how UFO controls angiosperm development

The transcriptional co-regulators NBCL1 and NBCL2 redundantly coordinate aerial organ development and root nodule identity in legumes

GRAS transcription factor PINNATE-LIKE PENTAFOLIATA2 controls compound leaf morphogenesis in Medicago truncatula

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