The origin and maintenance of nuclear endosperms: viewing development through a phylogenetic lens

Geeta, R.

doi:10.1098/rspb.2002.2206

Cited by 34 publications

(17 citation statements)

References 37 publications

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“…In addition, the cell types in the endosperm differ between the species, for example in the aleurone layer (Becraft, 2001). Furthermore, syncytial endosperm development has been suggested to have evolved independently in monocots and eudicots (Floyd et al, 1999;Friedman and Floyd, 2001;Geeta, 2003). Therefore, although A. thaliana and O. sativa share many similarities with regard to their respective post-zygotic hybridization barriers in the endosperm, the underlying molecular mechanisms may not be conserved between these species.…”

Section: Discussionmentioning

confidence: 99%

Dissection of two major components of the post‐zygotic hybridization barrier in rice endosperm

et al. 2013

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SUMMARYA post-zygotic hybridization barrier is often observed in the endosperm of seeds produced by interspecific or interploidy crosses. In Arabidopsis thaliana, for example, hybrid endosperm from both types of cross shows altered timing of cellularization and an altered rate of nuclear divisions. Therefore, it has been proposed that interspecific and interploidy crosses share common molecular mechanisms for establishment of an effective species barrier. However, these two types of hybridization barrier may be initiated by different intrinsic cues: the interspecific cross barrier arises after hybridization of genomes with differences in DNA sequences, while the interploidy cross barrier arises after hybridization of genomes with the same DNA sequences but differences in ploidy levels. In this study, we performed interploidy crosses to identify components of the post-hybridization barrier in the endosperm of rice. We performed an intra-cultivar cross of autotetraploid (4n) 3 diploid (2n) rice, and found precocious cellularization and a decreased rate of nuclear division in the syncytial endosperm. By contrast, seeds from the reciprocal cross showed delayed cellularization and an increased rate of nuclear division. This differential effect on nuclear division rates contrasts with the outcome of rice interspecific crosses, which were previously shown to have altered timing of cellularization without any change in nuclear division rates. Thus, we propose that the post-zygotic hybridization barrier in rice endosperm has two separable components, namely control of the timing of cellularization and control of the nuclear division rates in the syncytial stage of endosperm development.

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Section: Discussionmentioning

confidence: 99%

Dissection of two major components of the post‐zygotic hybridization barrier in rice endosperm

et al. 2013

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“…In light of this information, Friedman and Williams (2004) favor the second hypothesis, that the triploid endosperm evolved from a maternal (megagametophyte) endosperm to a biparental tissue by the addition of the male nucleus at a later stage in evolution (see also Friedman and Floyd, 2001;Williams and Friedman, 2002). Finally, based on phylogenetic studies, the ancestral endosperm is believed to have been cellular and the nuclear endosperm is believed to have arisen multiple times, including in the angiosperm lineages of the cereals and Arabidopsis (reviewed by Geeta, 2003).…”

Section: The Evolutionary Origin Of Nuclear Endospermmentioning

confidence: 99%

Nuclear Endosperm Development in Cereals and Arabidopsis thaliana

Olsen

2004

THE PLANT CELL ONLINE

410

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“…This problem is now being addressed through coordinated phylogenetic and developmental analyses of morphological characters (e.g., Rogers and Kaufman, 1997;Stark et al, 1999;Geeta, 2003;Sucena et al, 2003), but case studies are few.…”

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confidence: 99%

Phylogenetics of Eggshell Morphogenesis in Antheraea (Lepidoptera: Saturniidae): Unique Origin and Repeated Reduction of the Aeropyle Crown

Regier

Paukstadt

et al. 2005

Systematic Biology

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Integrated phylogenetic and developmental analyses should enhance our understanding of morphological evolution and thereby improve systematists' ability to utilize morphological characters, but case studies are few. The eggshell (chorion) of Lepidoptera (Insecta) has proven especially tractable experimentally for such analyses because its morphogenesis proceeds by extracellular assembly of proteins. This study focuses on a morphological novelty, the aeropyle crown, that arises at the end of choriogenesis in the wild silkmoth genus Antheraea. Aeropyle crowns are cylindrical projections, ending in prominent prongs, that surround the openings of breathing tubes (aeropyle channels) traversing the chorion. They occur over the entire egg surface in some species, are localized to a circumferential band in many others, and in some are missing entirely, thus exhibiting variation typical of discrete characters analyzed in morphological phylogenetics. Seeking an integrated developmental-phylogenetic view, we first survey aeropyle crown variation broadly across Antheraea and related genera. We then map these observations onto a robust phylogeny, based on three nuclear genes, to test the adequacy of character codings for aeropyle crown variation and to estimate the frequency and direction of change in those characters. Thirdly, we draw on previous studies of choriogenesis, supplemented by new data on gene expression, to hypothesize developmental-genetic bases for the inferred chorion character transformations. Aeropyle crowns are inferred to arise just once, in the ancestor of Antheraea, but to undergo four or more subsequent reductions without regain, a pattern consistent with Dollo's Law. Spatial distribution shows an analogous trend, though less clear-cut, toward reduction of coverage by aeropyle crowns. These trends suggest either that there is little or no natural selection on the details of the aeropyle crown structure or that evolution toward functional optima is ongoing, although no direct evidence exists for either. Genetic, biochemical, and microscopy studies point to at least two developmental changes underlying the origin of the aeropyle crown, namely, reinitiation of deposition of chorionic lamellae after the end of normal choriogenesis (i.e., heterochrony), and sharply increased production of underlying "filler" proteins that push the nascent final lamellae upward to form the crown (i.e., heteroposy). Identification of a unique putative cis-regulatory element shared by unrelated genes involved in aeropyle crown formation suggests a possible simple mechanism for repeated evolutionary reduction and spatial restriction of aeropyle crowns.

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The origin and maintenance of nuclear endosperms: viewing development through a phylogenetic lens

Cited by 34 publications

References 37 publications

Dissection of two major components of the post‐zygotic hybridization barrier in rice endosperm

Dissection of two major components of the post‐zygotic hybridization barrier in rice endosperm

Nuclear Endosperm Development in Cereals and Arabidopsis thaliana

Phylogenetics of Eggshell Morphogenesis in Antheraea (Lepidoptera: Saturniidae): Unique Origin and Repeated Reduction of the Aeropyle Crown

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