Journal ArticleDOI
Transition of somatic plant cells to an embryogenic state
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TLDR
This review summarizes relevant experimental observations that can contribute to the description and definition of a transitional state of somatic cells induced to form totipotent, embryogenic cells.Abstract:
Under appropriate in vivo or in vitro conditions, certain somatic plant cells have the capability to initiate embryogenic development (somatic embryogenesis). Somatic embryogenesis provides an unique experimental model to understand the molecular and cellular bases of developmental plasticity in plants. In the last few years, the application of modern experimental techniques, as well as the characterization of Arabidopsis embryogenesis mutants, have resulted in the accumulation of novel data about the acquisition of embryogenic capabilities by somatic plant cells. In this review, we summarize relevant experimental observations that can contribute to the description and definition of a transitional state of somatic cells induced to form totipotent, embryogenic cells. During this somatic-to-embryogenic transition, cells have to dedifferentiate, activate their cell division cycle and reorganize their physiology, metabolism and gene expression patterns. The roles of stress, endogenous growth regulators and chromatin remodelling in the coordinated reorganization of the cellular state are especially emphasized.read more
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Involvement of plant hormones and plant growth regulators on in vitro somatic embryogenesis
TL;DR: Recent progress achieved on understanding the interaction between exogenously added plant growth regulators over the concentration of endogenous hormones, together with the involvement of sensitivity of the tissues to particular hormone groups, might help clarifying the occurrence of divergent patterns in somatic embryogenesis, and in tissue culture in general.
Journal ArticleDOI
Somatic embryogenesis - Stress-induced remodeling of plant cell fate.
TL;DR: The present knowledge on chromatin-based mechanisms potentially involved in the somatic-to-embryogenic developmental transition is summarized, emphasizing the potential role of the chromatin to integrate stress, hormonal, and developmental pathways leading to the activation of the embryogenic program.
Journal ArticleDOI
Factors influencing somatic embryogenesis induction and plant regeneration with particular reference to Arabidopsis thaliana (L.) Heynh
TL;DR: A review of the conditions influencing the induction of embryogenic potential in in vitro cultured plant cells and the problem of the genetic characteristics of regenerants, in terms of their chimerism and somaclonal variation, is discussed in some detail.
Journal ArticleDOI
LECs go crazy in embryo development
TL;DR: It is proposed that specific target genes activated by the LEC TFs underlie, in part, their roles in the maturation phase and SE, and that the effect of L EC TFs on the balance of abscisic acid to gibberellic acid might link their role in totipotency and thematuration phase.
Journal ArticleDOI
Regulation of Somatic Embryogenesis in Higher Plants
Xiyan Yang,Xianlong Zhang +1 more
TL;DR: This review provides a systematic and comprehensive analysis of current advances in the development of somatic embryogenesis, as well as the cellular and molecular mechanism of somatics embryogenesis in higher plants.
References
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Journal ArticleDOI
Plant development going MADS
TL;DR: It is demonstrated that MADS genes in Arabidopsis are important regulators not only of meristem and floral organ identity but also of flowering timing and cell-type specification in floral organs.
Journal ArticleDOI
Direct somatic embryogenesis in roots of Cichorium : is callose an early marker ?
TL;DR: Cet article traite de l'origine et du mode de developpement des embryons somatiques de racines de Chicoree and des modifications de la paroi cellulaire aux sites d'initiation of l'embryogenese.
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Promotive and inhibitory effects of diverse arabinogalactan proteins on Daucus carota L. somatic embryogenesis
TL;DR: It is reported that addition of the ZUM18 AGP fraction to different size-fractionated cell populations isolated from embryogenic carrot suspension cultures does not show a significant effect on the frequency and the morphology of the somatic embryos produced and that cell type composition in suspension cultures is important for evaluating the effect of exogenous AGPs.
Journal ArticleDOI
Induction of Somatic Embryogenesis in Carrot by Osmotic Stress
TL;DR: Segments of cotyledon and apical tip taken from 1-week-old seedlings of Daucus carota L. were cultured for 3 weeks on hormone-free Murashige and Skoog's medium containing high amounts of sucrose and transferred to the same medium with lower sucrose concentration, resulting in somatic embryos being formed 3 to 6 weeks after the transfer.
Journal ArticleDOI
A carrot cell variant temperature sensitive for somatic embryogenesis reveals a defect in the glycosylation of extracellular proteins.
F. Lo Schiavo,Giovanni Giuliano,S.C. De Vries,Annamaria Genga,R. Bollini,Letizia Pitto,F. Cozzani,V. Nuti-Ronchi,M. Terzi +8 more
TL;DR: Observations indicate that ts11c is not able to perform proper glycosylation at the non-permissive temperature and suggest that the activity of certain extracellular proteins, essential for the transition of globular to heart stage somatic embryos, depends on the correct modification of their oligosaccharide side-chains.
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