Compound leaves: equal to the sum of their parts?

Champagne, Connie E. M.; Sinha, Neelima

doi:10.1242/dev.01338

Cited by 102 publications

(78 citation statements)

References 117 publications

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“…One model postulates increasing subdivision of a simple leaf by sequentially increased serration, lobing and, finally, division. A second model instead suggests that compound leaves result from increased indeterminacy and branch formation; each leaflet is considered a small, simple leaf (Champagne and Sinha, 2004). The lmi1 phenotype supports the latter hypothesis; we see increased lobing and division at the base of the leaf, yet a reduction in overall serration.…”

Section: Roles Of Lmi1 In Bracts and Leavessupporting

confidence: 56%

The LEAFY target LMI1 is a meristem identity regulator and acts together with LEAFY to regulate expression ofCAULIFLOWER

et al. 2006

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The timing of the switch from vegetative to reproductive development is crucial for species survival. The plant-specific transcription factor and meristem identity regulator LEAFY (LFY) controls this switch in Arabidopsis, in part via the direct activation of two other meristem identity genes, APETALA1 (AP1) and CAULIFLOWER (CAL). We recently identified five new direct LFY targets as candidates for the missing meristem identity regulators that act downstream of LFY. Here, we demonstrate that one of these, the class I homeodomain leucine-zipper transcription factor LMI1, is a meristem identity regulator. LMI1 acts together with LFY to activate CAL expression. The interaction between LFY, LMI1 and CAL resembles a feed-forward loop transcriptional network motif. LMI1 has additional LFY-independent roles in the formation of simple serrated leaves and in the suppression of bract formation. The temporal and spatial expression of LMI1 supports a role in meristem identity and leaf/bract morphogenesis.

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Section: Roles Of Lmi1 In Bracts and Leavessupporting

confidence: 56%

The LEAFY target LMI1 is a meristem identity regulator and acts together with LEAFY to regulate expression ofCAULIFLOWER

et al. 2006

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“…GOB affects the rate of leaf maturation, leaflet elaboration and secondary-leaflet initiation A final leaf shape can result from different early events (Champagne and Sinha, 2004). We followed early leaf development in backgrounds with altered GOB activity to further understand the role of GOB in the ontogeny of the tomato compound leaf (Fig.…”

Section: Ectopic Gob Expression Dramatically Affects Compound-leaf Pamentioning

confidence: 99%

The NAC-domain transcription factor GOBLET specifies leaflet boundaries in compound tomato leaves

et al. 2009

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Leaves are formed at the flanks of the shoot apical meristem (SAM) and develop into a variety of forms. In tomato, prolonged leaf patterning enables the elaboration of compound leaves by reiterative initiation of leaflets with lobed margins. In goblet (gob) lossof-function mutants, primary leaflets are often fused, secondary leaflets and marginal serrations are absent, and SAMs often terminate precociously. We show that GOB encodes a NAC-domain transcription factor expressed in narrow stripes at the leaf margins, flanking the distal side of future leaflet primordia, and at the boundaries between the SAM and leaf primordia. Leafspecific overexpression of the microRNA miR164, a negative regulator of GOB-like genes, also leads to loss of secondary-leaflet initiation and to smooth leaflet margins. Plants carrying a dominant gob allele with an intact ORF but disrupted miR164 binding site produce more cotyledons and floral organs, have split SAMs and, surprisingly, simpler leaves. Overexpression of a form of GOB with an altered miR164 binding site in leaf primordia leads to delayed leaflet maturation, frequent, improperly timed and spaced initiation events, and a simple mature leaflet form owing to secondary-leaflet fusion. miR164 also affects leaflet separation in Cardamine hirsuta, a Brassicaceae species with complex leaves. Genetic and molecular analyses suggest that GOB expression is intact in the simplified leaves of entire tomato mutants, which have a defect in a putative repressor of auxin responses. Our results show that GOB marks leaflet boundaries and that its accurate spatial, temporal and quantitative activity affects leaf elaboration in a context-dependent manner.

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“…Así, tomando en cuenta que la derivación de láminas simples a láminas compuestas puede apreciarse como una homología dentro de las dicotiledóneas (Bharathan & Sinha 2001;Champagne & Sinha 2004) parece plausible considerar que el patrón actinódromo, compartido con las tribus basales de la familia Convolvulaceae (Stefanovic et al 2002) es el estado más ancestral de la venación en Merremia, y que mediante cuatro eventos diferentes pudieron desarrollarse todos los patrones de venación actualmente observados.…”

Section: Morfología Foliarunclassified

El género Merremia (Convolvulaceae) en Venezuela

et al. 2010

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ResumenSe presenta el estudio taxonómico de Merremia (Convolvulaceae) en Venezuela utilizando el lenguaje DELTA, señalando nuevos aportes para el género. Se revisó material herborizado de herbarios venezolanos, confirmando la presencia de 12 especies de Merremia en Venezuela. Se elaboraron dos claves de determinación de especies, una considerando sólo caracteres vegetativos y otra con caracteres vegetativos y reproductivos. Se ofrecen descripciones detalladas de las especies. Se georreferenciaron los especímenes para determinar los mapas de distribución de especies, y se muestran nuevos reportes de distribución por estado. Palabras clave: DELTA, flora, sistemática, taxonomía. AbstractA taxonomic study of Merremia (Convolvulaceae) from Venezuela was performed with the help of DELTA software, indicating new contributions for the genus. Dry samples from Venezuelan herbaria were reviewed, confirming the presence of 12 species of Merremia in Venezuela. Two identification keys were constructed, one considering only vegetative characters and the other grouping vegetative and reproductive characters. Detailed species descriptions are provided. Specimens were georeferenced to determine species distribution maps and new distribution reports for states are shown.

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Compound leaves: equal to the sum of their parts?

Cited by 102 publications

References 117 publications

The LEAFY target LMI1 is a meristem identity regulator and acts together with LEAFY to regulate expression ofCAULIFLOWER

The LEAFY target LMI1 is a meristem identity regulator and acts together with LEAFY to regulate expression ofCAULIFLOWER

The NAC-domain transcription factor GOBLET specifies leaflet boundaries in compound tomato leaves

El género Merremia (Convolvulaceae) en Venezuela

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