Molecular Physiology of Legume Seed Development

Weber, Hans; Borisjuk, Ljudmilla; Wobus, Ulrich

doi:10.1146/annurev.arplant.56.032604.144201

Cited by 468 publications

(512 citation statements)

References 157 publications

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“…On the other hand, the requirement for high Suc in the medium for proper organ differentiation identifies Suc as a maternal signaling component in endosperm development. This observation appears to be in accord with other reports describing carbon sources as having influence on aspects of endosperm development (Miller and Chourey, 1992;Weber et al, 2005). Although sugar sensing is an emerging area of plant research (e.g.…”

Section: Discussionsupporting

confidence: 92%

Surface Position, Not Signaling from Surrounding Maternal Tissues, Specifies Aleurone Epidermal Cell Fate in Maize

et al. 2006

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Maize (Zea mays) endosperm consists of an epidermal-like surface layer of aleurone cells, an underlying body of starchy endosperm cells, and a basal layer of transfer cells. To determine whether surrounding maternal tissues perform a role in specifying endosperm cell fates, a maize endosperm organ culture technique was established whereby the developing endosperm is completely removed from surrounding maternal tissues. Using cell type-specific fluorescence markers, we show that aleurone cell fate specification occurs exclusively in response to surface position and does not require specific, continued maternal signal input. The starchy endosperm and aleurone cell fates are freely interchangeable throughout the lifespan of the endosperm, with internalized aleurone cells converting to starchy endosperm cells and with starchy endosperm cells that become positioned at the surface converting to aleurone cells. In contrast to aleurone and starchy endosperm cells, transfer cells fail to develop in in vitrogrown endosperm, supporting earlier indications that maternal tissue interaction is required to fully differentiate this cell type. Several parameters confirm that the maize endosperm organ cultures described herein retain the main developmental features of in planta endosperm, including fidelity of aleurone mutant phenotypes, temporal and spatial control of cell type-specific fluorescent markers, specificity of cell type transcripts, and control of mitotic cell divisions.

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Section: Discussionsupporting

confidence: 92%

Surface Position, Not Signaling from Surrounding Maternal Tissues, Specifies Aleurone Epidermal Cell Fate in Maize

et al. 2006

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“…In endospermic seeds (e.g., cereals), the endosperm surrounds the embryo and plays an important role in nutrientstoring (Sreenivasulu and Wobus, 2013). By contrast, the endosperm of nonendospermic seeds (e.g., most legumes) is consumed by the embryo, which becomes the primary storage tissue (Weber et al, 2005). Finally, perispermic seeds (e.g., pseudocereals such as amaranth and quinoa) develop a large perisperm, a tissue originating from the nucellus, along with a minute endosperm (Burrieza et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Endosperm and Nucellus Develop Antagonistically in Arabidopsis Seeds

et al. 2016

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In angiosperms, seed architecture is shaped by the coordinated development of three genetically different components: embryo, endosperm, and maternal tissues. The relative contribution of these tissues to seed mass and nutrient storage varies considerably among species. The development of embryo, endosperm, or nucellus maternal tissue as primary storage compartments defines three main typologies of seed architecture. It is still debated whether the ancestral angiosperm seed accumulated nutrients in the endosperm or the nucellus. During evolution, plants shifted repeatedly between these two storage strategies through molecular mechanisms that are largely unknown. Here, we characterize the regulatory pathway underlying nucellus and endosperm tissue partitioning in Arabidopsis thaliana. We show that Polycomb-group proteins repress nucellus degeneration before fertilization. A signal initiated in the endosperm by the AGAMOUS-LIKE62 MADS box transcription factor relieves this Polycomb-mediated repression and therefore allows nucellus degeneration. Further downstream in the pathway, the TRANSPARENT TESTA16 (TT16) and GORDITA MADS box transcription factors promote nucellus degeneration. Moreover, we demonstrate that TT16 mediates the crosstalk between nucellus and seed coat maternal tissues. Finally, we characterize the nucellus cell death program and its feedback role in timing endosperm development. Altogether, our data reveal the antagonistic development of nucellus and endosperm, in coordination with seed coat differentiation.

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“…The importance of ETCs for grain yield has been shown in several studies (Weschke et al, 2000(Weschke et al, , 2003Weber et al, 2005). However, the machinery responsible for the protection of the ETCs, and hence the maintenance of assimilate transport into the endosperm, has not been elucidated as yet.…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Dynamics of Fructan Metabolism in Developing Barley Grains

et al. 2014

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Barley (Hordeum vulgare) grain development follows a series of defined morphological and physiological stages and depends on the supply of assimilates (mainly sucrose) from the mother plant. Here, spatio-temporal patterns of sugar distributions were investigated by mass spectrometric imaging, targeted metabolite analyses, and transcript profiling of microdissected grain tissues. Distinct spatio-temporal sugar balances were observed, which may relate to differentiation and grain filling processes. Notably, various types of oligofructans showed specific distribution patterns. Levan-and graminan-type oligofructans were synthesized in the cellularized endosperm prior to the commencement of starch biosynthesis, while during the storage phase, inulin-type oligofructans accumulated to a high concentration in and around the nascent endosperm cavity. In the shrunken endosperm mutant seg8, with a decreased sucrose flux toward the endosperm, fructan accumulation was impaired. The tight partitioning of oligofructan biosynthesis hints at distinct functions of the various fructan types in the young endosperm prior to starch accumulation and in the endosperm transfer cells that accomplish the assimilate supply toward the endosperm at the storage phase.

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Molecular Physiology of Legume Seed Development

Cited by 468 publications

References 157 publications

Surface Position, Not Signaling from Surrounding Maternal Tissues, Specifies Aleurone Epidermal Cell Fate in Maize

Surface Position, Not Signaling from Surrounding Maternal Tissues, Specifies Aleurone Epidermal Cell Fate in Maize

Endosperm and Nucellus Develop Antagonistically in Arabidopsis Seeds

Spatio-Temporal Dynamics of Fructan Metabolism in Developing Barley Grains

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