Inflorescence Commitment and Architecture in
            <i>Arabidopsis</i>

Bradley, Desmond; Ratcliffe, Oliver J.; Vincent, Coral; Carpenter, Rosemary; Coen, Enrico

doi:10.1126/science.275.5296.80

Cited by 798 publications

(764 citation statements)

References 17 publications

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“…In wild-type plants, the floral transition is associated with transcriptional induction of DETERMINATE (DET) and PROLIFERATING INFLORESCENCE MERISTEM (PIM) [14][15][16][17] (Fig. 3a), which, like their Arabidopsis orthologues TERMINAL FLOWER 1 (TFL1) 18 and APETALA 1 (AP1) 19 , control the identity of the inflorescence and the floral meristems 14 expressed in wild-type plants, expression was not observed in veg1 (Fig. 3a), consistent with the absence of flowers or floral organs.…”

Section: Veg1 Is Required To Make Secondary Inflorescencesmentioning

confidence: 99%

VEGETATIVE1 is essential for development of the compound inflorescence in pea

et al. 2012

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unravelling the basis of variation in inflorescence architecture is important to understanding how the huge diversity in plant form has been generated. Inflorescences are divided between simple, as in Arabidopsis, with flowers directly formed at the main primary inflorescence axis, and compound, as in legumes, where they are formed at secondary or even higher order axes. The formation of secondary inflorescences predicts a novel genetic function in the development of the compound inflorescences. Here we show that in pea this function is controlled by VEGETATIVE1 (VEG1), whose mutation replaces secondary inflorescences by vegetative branches. We identify VEG1 as an AGL79-like mADs-box gene that specifies secondary inflorescence meristem identity. VEG1 misexpression in meristem identity mutants causes ectopic secondary inflorescence formation, suggesting a model for compound inflorescence development based on antagonistic interactions between VEG1 and genes conferring primary inflorescence and floral identity. our study defines a novel mechanism to generate inflorescence complexity.

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Section: Veg1 Is Required To Make Secondary Inflorescencesmentioning

confidence: 99%

VEGETATIVE1 is essential for development of the compound inflorescence in pea

et al. 2012

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“…O alelo sp, portanto, não altera completamente o padrão de florescimento, mas interrompe a regularidade com a qual as fases reprodutiva e vegetativa se alternam (PNUELI et al, 1998). O gene SP já foi isolado e sequenciado e hoje sabemos que ele codifica uma proteína do tipo fosfatidiletanolamina, a qual pode ser um componente do complexo de membranas envolvido na transdução de sinais (BRADLEY et al, 1996;BRADLEY et al, 1997). O alelo selvagem (SP) atua impedindo a ocorrência do florescimento precoce (antes da emissão de oito folhas).…”

Section: Introductionunclassified

Base genética do hábito de crescimento e florescimento em tomateiro e sua importância na agricultura

Piotto

Peres

2012

Cienc. Rural

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“…In particular, its cytohistological zonation fades away and ultimately disappears (NougareÁ de 1967;Lyndon 1998), and the pattern of gene activity is completely changed. For instance, up-regulation of some genes like Arabidopsis TFL1 or Sinapis SaMADS A and FPF1 is observed at particular times and in particular areas of the transitional SAM (Menzel et al 1996;Bradley et al 1997;Kania et al 1997). This step-wise and tissuespeci®c transformation of the SAM points to a complex coordination network of cell activities (Huala and Sussex 1993; van der Schoot and Rinne 1999).…”

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The frequency of plasmodesmata increases early in the whole shoot apical meristem of Sinapis alba L. during floral transition

Orménèse

Havelange

Deltour

et al. 2000

Planta

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Abstract. The frequency of plasmodesmata increases in the shoot apical meristem of plants of Sinapis alba L. induced to¯ower by exposure to a single long day. This increase is observed within all cell layers (L1, L2, L3) as well as at the interfaces between these layers, and it occurs in both the central and peripheral zones of the shoot apical meristem. The extra plasmodesmata are formed only transiently, from 28 to 48 h after the start of the long day, and acropetally since they are detectable in L3 4 h before they are seen in L1 and L2. These observations indicate that (i) in the Sinapis shoot apical meristem at¯oral transition, there is an unfolding of a single ®eld with increased plasmodesmatal connectivity, and (ii) this event is an early e ect of the arrival at this meristem of the¯oral stimulus of leaf origin. Since (i) the wave of increased frequency of plasmodesmata is 12 h later than the wave of increased mitotic frequency (A. Jacqmard et al. 1998, Plant cell proliferation and its regulation in growth and development, pp. 67±78; Wiley), and (ii) the increase in frequency of plasmodesmata is observed in all cell walls, including in walls not deriving from recent divisions (periclinal walls separating the cell layers), it is concluded that the extra plasmodesmata seen at¯oral transition do not arise in the forming cell plate during mitosis and are thus of secondary origin.Key words: Floral transition ± Plasmodesmata formation ± Secondary plasmodesmata ± Shoot apical meristem ± Sinapis (¯oral transition) IntroductionThe vegetative shoot apical meristem (SAM) in dicots has the shape of a dome and consists of a relatively small number of undi erentiated dividing cells arranged in layers (Lyndon 1998). Cells of the two most super®cial layers, L1 and L2, divide anticlinally (perpendicular to the meristem surface), except those L2 cells in the peripheral sectors involved in organogenesis that may divide periclinally (parallel to the meristem surface). Layers L1 and L2 collectively form the tunica which is responsible for surface growth of the SAM. The L3 cells, i.e. all cells below L1 and L2, divide in all planes and collectively form the corpus which is responsible for the growth in SAM volume. Given this pattern of orientation of cell divisions, cell walls in the SAM are not all of the same age: anticlinal walls in the tunica and all walls in the corpus are younger, i.e. derive from more recent divisions, than the periclinal walls in the tunica. A cytohistological zonation is usually superimposed on this layered structure, with the centrally located cells of both the tunica and corpus dividing less frequently and having less RNA and protein than the peripherally located cells of these tissues (Steeves and Sussex 1989;Lyndon 1998).During the¯oral transition, although the layered structure persists, other aspects of SAM structure and activity are profoundly altered (Lyndon 1998). In particular, its cytohistological zonation fades away and ultimately disappears (NougareÁ de 1967;Lyndon 1998), and the pattern o...

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Inflorescence Commitment and Architecture in Arabidopsis

Cited by 798 publications

References 17 publications

VEGETATIVE1 is essential for development of the compound inflorescence in pea

VEGETATIVE1 is essential for development of the compound inflorescence in pea

Base genética do hábito de crescimento e florescimento em tomateiro e sua importância na agricultura

The frequency of plasmodesmata increases early in the whole shoot apical meristem of Sinapis alba L. during floral transition

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