Identification of putative homologs of Larix decidua to BABYBOOM (BBM), LEAFY COTYLEDON1 (LEC1), WUSCHEL-related HOMEOBOX2 (
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- 作者：Andrea Rupps ; Juliane Raschke ; Martin Rümmler ; Bettina Linke ; Kurt Zoglauer
- 关键词：Conifers ; Embryogenesis ; related genes ; In situ hybridization ; Heterologous overexpression
- 刊名：Planta
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：243
- 期：2
- 页码：473-488
- 全文大小：4,523 KB
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Juliane Raschke (1)
Martin Rümmler (1)
Bettina Linke (1)
Kurt Zoglauer (1)
1. Institute of Biology, Department of Botany and Arboretum, Humboldt-Universität zu Berlin, Invalidenstr. 42, 10115, Berlin, Germany - 刊物主题：Plant Sciences; Agriculture; Ecology; Forestry;
- 出版者：Springer Berlin Heidelberg
- ISSN：1432-2048
文摘
Main conclusion Embryogenesis-related genes ( LdBBM, LdLEC1, LdWOX2 and LdSERK ) were confirmed in sequence and expression abundance for Larix decidua —these findings are valid for somatic as well as for zygotic embryo development. Somatic embryogenesis is a reliable source of high-quality genotypes as it presents an advantageous alternative for conifers in forestry, independent from seed production. Although this propagation method is already being applied, molecular factors initiating and controlling the process remain to be understood. The embryogenesis-associated genes BABYBOOM (BBM), LEAFY COTYLEDON1 (LEC1), WUSCHEL-related HOMEOBOX2 (WOX2) and SOMATIC EMBRYOGENESIS RECEPTOR-like KINASE (SERK) were identified and analyzed in somatic embryos of the European larch, L. decidua Mill. Subsequent comparisons with annotated sequences displayed similarities with angiosperm homologs. Transcript accumulation of the identified genes during embryogenesis has been analyzed. LdLEC1 and LdWOX2 are mainly expressed during early embryogenesis, whereas LdBBM and LdSERK reveal increased expression during later development. Temporal and spatial expression studies revealed a specific LdLEC1 signal in the outer cell layer of young embryo heads, whereas mature embryos showed a homogeneous expression. The overexpression of LdLEC1 in Arabidopsis influences germination and cotyledon formation, thus indicating the interspecific importance of LEC1 for proper embryo and specifically cotyledon development. Our data support a conserved role of principal regulators during plant embryogenesis that may be used as molecular markers for embryogenicity and to further determine initiating processes of somatic embryogenesis.