Control of Tissue and Organ Growth in Plants

Breuninger, Holger; Lenhard, Michael

doi:10.1016/s0070-2153(10)91007-7

Cited by 82 publications

(66 citation statements)

References 119 publications

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“…This is remarkable when considering that most mutants with altered organ size identified from mutagenesis screens in Arabidopsis or Antirrhinum majus show changes to both leaf and floral organ sizes (Breuninger and Lenhard, 2010). These general growth effects indicate that the developmentalgenetic factors that control organ growth are largely shared between leaves and the homologous floral organs.…”

Section: Developmental Basis Of the Altered Flower Morphology In C Rmentioning

confidence: 99%

Genetics, Evolution, and Adaptive Significance of the Selfing Syndrome in the GenusCapsella

et al. 2011

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The change from outbreeding to selfing is one of the most frequent evolutionary transitions in flowering plants. It is often accompanied by characteristic morphological and functional changes to the flowers (the selfing syndrome), including reduced flower size and opening. Little is known about the developmental and genetic basis of the selfing syndrome, as well as its adaptive significance. Here, we address these issues using the two closely related species Capsella grandiflora (the ancestral outbreeder) and red shepherd's purse (Capsella rubella, the derived selfer). In C. rubella, petal size has been decreased by shortening the period of proliferative growth. Using interspecific recombinant inbred lines, we show that differences in petal size and flower opening between the two species each have a complex genetic basis involving allelic differences at multiple loci. An intraspecific cross within C. rubella suggests that flower size and opening have been decreased in the C. rubella lineage before its extensive geographical spread. Lastly, by generating plants that likely resemble the earliest ancestors of the C. rubella lineage, we provide evidence that evolution of the selfing syndrome was at least partly driven by selection for efficient self-pollination. Thus, our studies pave the way for a molecular dissection of selfingsyndrome evolution.

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Section: Developmental Basis Of the Altered Flower Morphology In C Rmentioning

confidence: 99%

Genetics, Evolution, and Adaptive Significance of the Selfing Syndrome in the GenusCapsella

et al. 2011

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“…The growth of distinct tissues forming an organ must be scaled to size, but it is not clear how this is attained. Tissue growth can be controlled by regulation of cell division, apoptosis, or cell size (Crickmore and Mann 2008;Breuninger and Lenhard 2010). Although increased cell size can be achieved via accumulation of cell mass during growth of diploid cells, increased cell size often is produced during development via polyploidization (Edgar and Orr-Weaver 2001;Lee et al 2009).…”

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confidence: 99%

Polyploidization of glia in neural development links tissue growth to blood–brain barrier integrity

Unhavaithaya¹,

2012

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Proper development requires coordination in growth of the cell types composing an organ. Many plant and animal cells are polyploid, but how these polyploid tissues contribute to organ growth is not well understood. We found the Drosophila melanogaster subperineurial glia (SPG) to be polyploid, and ploidy is coordinated with brain mass. Inhibition of SPG polyploidy caused rupture of the septate junctions necessary for the blood-brain barrier. Thus, the increased SPG cell size resulting from polyploidization is required to maintain the SPG envelope surrounding the growing brain. Polyploidization likely is a conserved strategy to coordinate tissue growth during organogenesis, with potential vertebrate examples.

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“…In most, but not all, cases, the final organ size correlates with cell number, rendering cell division the main driver that controls growth (1).…”

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confidence: 99%

SAMBA, a plant-specific anaphase-promoting complex/cyclosome regulator is involved in early development and A-type cyclin stabilization

Eloy

González

Leene

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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The anaphase-promoting complex/cyclosome (APC/C) is a large multiprotein E3 ubiquitin ligase involved in ubiquitin-dependent proteolysis of key cell cycle regulatory proteins, including the destruction of mitotic cyclins at the metaphase-to-anaphase transition. Despite its importance, the role of the APC/C in plant cells and the regulation of its activity during cell division remain poorly understood. Here, we describe the identification of a plant-specific negative regulator of the APC/C complex, designated SAMBA. In Arabidopsis thaliana, SAMBA is expressed during embryogenesis and early plant development and plays a key role in organ size control. Samba mutants produced larger seeds, leaves, and roots, which resulted from enlarged root and shoot apical meristems, and, additionally, they had a reduced fertility attributable to a hampered male gametogenesis. Inactivation of SAMBA stabilized A2-type cyclins during early development. Our data suggest that SAMBA regulates cell proliferation during early development by targeting CYCLIN A2 for APC/C-mediated proteolysis.

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Control of Tissue and Organ Growth in Plants

Cited by 82 publications

References 119 publications

Genetics, Evolution, and Adaptive Significance of the Selfing Syndrome in the GenusCapsella

Genetics, Evolution, and Adaptive Significance of the Selfing Syndrome in the GenusCapsella

Polyploidization of glia in neural development links tissue growth to blood–brain barrier integrity

SAMBA, a plant-specific anaphase-promoting complex/cyclosome regulator is involved in early development and A-type cyclin stabilization

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