Early markers are present in both embryogenesis pathways from microspores and immature zygotic embryos in cork oak, Quercus suberL

BMC Plant Biology

Research Article

Beatriz Pintos¹  Aránzazu Gómez-Garay¹  José-Antonio Manzanera²  María C Risueño³  María-Teresa Solís³  Héctor Rodríguez-Sanz³  Pilar S Testillano³ 

[1] Department of Plant Physiology, Faculty of Biology, Complutense University of Madrid, UCM, Ciudad Universitaria, 28040, Madrid, Spain;ETSI Montes, Technical University of Madrid, UPM, Ciudad Universitaria, 28040, Madrid, Spain;Pollen Biotechnology of Crop Plants group, Biological Research Center, CIB-CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain;

关键词: Somatic embryogenesis;    Microspore embryogenesis;    Anther culture;    DNA methylation;    5-methyl-deoxy-cytidine;    Pectin esterification;    Cell wall;    Auxin;    IAA;   

DOI  :  10.1186/s12870-014-0224-4

 received in 2014-05-16, accepted in 2014-08-11,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundIn Quercus suber, cork oak, a Mediterranean forest tree of economic and social interest, rapid production of isogenic lines and clonal propagation of elite genotypes have been achieved by developing in vitro embryogenesis from microspores and zygotic embryos respectively. Despite its high potential in tree breeding strategies, due to their recalcitrancy, the efficiency of embryogenesis in vitro systems in many woody species is still very low since factors responsible for embryogenesis initiation and embryo development are still largely unknown. The search for molecular and cellular markers during early stages of in vitro embryogenesis constitutes an important goal to distinguish, after induction, responsive from non-responsive cells, and to elucidate the mechanisms involved in embryogenesis initiation for their efficient manipulation. In this work, we have performed a comparative analysis of two embryogenesis pathways derived from microspores and immature zygotic embryos in cork oak in order to characterize early markers of reprogrammed cells in both pathways. Rearrangements of the cell structural organization, changes in epigenetic marks, cell wall polymers modifications and endogenous auxin changes were analyzed at early embryogenesis stages of the two in vitro systems by a multidisciplinary approach.ResultsResults showed that early embryo cells exhibited defined changes of cell components which were similar in both embryogenesis in vitro systems, cellular features that were not found in non-embryogenic cells. DNA methylation level and nuclear pattern, proportion of esterified pectins in cell walls, and endogenous auxin levels were different in embryo cells in comparison with microspores and immature zygotic embryo cells from which embryos originated, constituting early embryogenesis markers.ConclusionsThese findings suggest that DNA hypomethylation, cell wall remodeling by pectin esterification and auxin increase are involved in early in vitro embryogenesis in woody species, providing new evidences of the developmental pattern similarity between both embryogenesis pathways, from microspores and immature zygotic embryos, in woody species.

【 授权许可】

Unknown   
© Rodríguez-Sanz et al.; licensee BioMed Central Ltd. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.