The role of<i>JAGGED</i>in shaping lateral organs

Dinneny, José R.; Yadegari, Ramin; Fischer, Robert L.; Yanofsky, Martin F.; Weigel, Detlef

doi:10.1242/dev.00949

Cited by 289 publications

(343 citation statements)

References 46 publications

(43 reference statements)

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“…Leafy petioles are also caused by the ectopic expression of LEAFY PETIOLE (LEP), which encodes an EREBP/AP2-type transcription factor (van der Graaff et al, 2000), and JAGGED (JAG), which encodes a C 2 H 2 zinc finger transcription factor (Dinneny et al, 2004;Ohno et al, 2004). One possibility is that BOP activity regulates the spatial expression of leaf-promoting transcription factors such as JAG or LEP in the proximal parts of leaves and in floral bracts.…”

Section: Bop and Proximal-distal Leaf Patterningmentioning

confidence: 99%

“…Haughn, unpublished results). Plants misexpressing JAG also develop floral bracts (Dinneny et al, 2004;Ohno et al, 2004), another aspect of the bop1 bop2 mutant phenotype. Previous analyses of bop1-1 plants have shown that knox genes are also misexpressed in the leaves, predominantly in the petiole region (Ha et al, 2003).…”

Section: Bop and Proximal-distal Leaf Patterningmentioning

confidence: 99%

“…Floral stages were determined according to Smyth et al (1990). For the definition of floral bract, see Dinneny et al (2004).…”

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

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BLADE-ON-PETIOLE–Dependent Signaling Controls Leaf and Floral Patterning in Arabidopsis

et al. 2005

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NONEXPRESSOR OF PR GENES1 (NPR1) is a key regulator of the plant defense response known as systemic acquired resistance. Accumulation of the signal molecule salicylic acid (SA) leads to a change in intracellular redox potential, enabling NPR1 to enter the nucleus and interact with TGACG sequence-specific binding protein (TGA) transcription factors, which in turn bind to SA-responsive elements in the promoters of defense genes. Here, we show that two NPR1-like genes, BLADE-ON-PETIOLE1 (BOP1) and BOP2, function redundantly to control growth asymmetry, an important aspect of patterning in leaves and flowers. Phenotypes in the double mutant include leafy petioles, loss of floral organ abscission, and asymmetric flowers subtended by a bract. We demonstrate that BOP2 is localized to both the nucleus and the cytoplasm, but unlike NPR1, it is highly expressed in young floral meristems and in yeast interacts preferentially with the TGA transcription factor encoded by PERIANTHIA (PAN). In support of a biological relevance for this interaction, we show that bop1 bop2 and pan mutants share a pentamerous arrangement of first whorl floral organs, a patterning defect that is retained in bop1 bop2 pan triple mutants. Our data provide evidence that BOP proteins control patterning via direct interactions with TGA transcription factors and demonstrate that a signaling mechanism similar to that formally associated with plant defense is likely used for the control of developmental patterning.

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Section: Bop and Proximal-distal Leaf Patterningmentioning

confidence: 99%

Section: Bop and Proximal-distal Leaf Patterningmentioning

confidence: 99%

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BLADE-ON-PETIOLE–Dependent Signaling Controls Leaf and Floral Patterning in Arabidopsis

et al. 2005

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“…Although a number of studies have reported alteration of leaf form via gene manipulation, the majority of these investigations have utilized upstream regulators of development (e.g. transcription factors and hormonal signalling systems), making it difficult to define the actual downstream growth processes involved in generating the observed morphogenic response (Autran et al, 2002;Nath et al, 2003;Palatnik et al, 2003;Dinneny et al, 2004). Testing the hypothesis that growth repression could play a role in leaf morphogenesis requires the use of factors that are much closer to the final downstream effectors of growth.…”

Section: Introductionmentioning

confidence: 99%

Targeted manipulation of leaf form via local growth repression

Malinowski

Kasprzewska²,

Fleming³

2011

The Plant Journal

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SUMMARYA classical view is that leaf shape is the result of local promotion of growth linked to cell proliferation. However, an alternative hypothesis is that leaf form is the result of local repression of growth in an otherwise growing system. Here we show that leaf form can indeed be manipulated in a directed fashion by local repression of growth. We show that targeting expression of an inhibitor of a cyclin-dependent kinase (KRP1) to the sinus area of developing leaves of Arabidopsis leads to local growth repression and the formation of organs with extreme lobing, including generation of leaflet-like organs. Directing KRP1 expression to other regions of the leaf using an miRNA target sequence tagging approach also leads to predictable novel leaf forms, and repression of growth in the leaf margin blocks the outgrowth of lobes, leading to a smoother perimeter. In addition, we show that decreased growth around the perimeter and across the leaf abaxial surface leads to a change in 3D form, as predicted by mechanical models of leaf growth. Our analysis provides experimental evidence that local repression of growth influences leaf shape, suggesting that it could be part of the mechanism of morphogenesis in plants in the context of an otherwise growing system.

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“…Petal primordia arise at four loci in the second whorl, and this positioning is established independently of the process that determines organ identity (Griffith et al, 1999;Brewer et al, 2004;Takeda et al, 2004;Xing et al, 2005;Lampugnani et al, 2013). After initiation, the growth of petals depends on the activity of cell division and expansion along the proximal-distal axis, which is partly regulated by JAGGED (Dinneny et al, 2004;Ohno et al, 2004). Final petal size is determined by the balance of cell proliferation and expansion (Mizukami and Fischer, 2000;Szécsi et al, 2006).…”

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confidence: 99%

Physical Interaction of Floral Organs Controls Petal Morphogenesis in Arabidopsis

et al. 2013

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Flowering plants bear beautiful flowers to attract pollinators. Petals are the most variable organs in flowering plants, with their color, fragrance, and shape. In Arabidopsis (Arabidopsis thaliana), petal primordia arise at a similar time to stamen primordia and elongate at later stages through the narrow space between anthers and sepals. Although many of the genes involved in regulating petal identity and primordia growth are known, the molecular mechanism for the later elongation process remains unknown. We found a mutant, folded petals1 (fop1), in which normal petal development is inhibited during their growth through the narrow space between sepals and anthers, resulting in formation of folded petals at maturation. During elongation, the fop1 petals contact the sepal surface at several sites. The conical-shaped petal epidermal cells are flattened in the fop1 mutant, as if they had been pressed from the top. Surgical or genetic removal of sepals in young buds restores the regular growth of petals, suggesting that narrow space within a bud is the cause of petal folding in the fop1 mutant. FOP1 encodes a member of the bifunctional wax ester synthase/diacylglycerol acyltransferase family, WSD11, which is expressed in elongating petals and localized to the plasma membrane. These results suggest that the FOP1/WSD11 products synthesized in the petal epidermis may act as a lubricant, enabling uninhibited growth of the petals as they extend between the sepals and the anthers.

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The role ofJAGGEDin shaping lateral organs

Cited by 289 publications

References 46 publications

BLADE-ON-PETIOLE–Dependent Signaling Controls Leaf and Floral Patterning in Arabidopsis

BLADE-ON-PETIOLE–Dependent Signaling Controls Leaf and Floral Patterning in Arabidopsis

Targeted manipulation of leaf form via local growth repression

Physical Interaction of Floral Organs Controls Petal Morphogenesis in Arabidopsis

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