Journal Article

<i>C-ABI3</i>, the Carrot Homologue of the <i>Arabidopsis ABI3</i>, is Expressed during Both Zygotic and Somatic Embryogenesis and Functions in the Regulation of Embryo-Specific ABA-Inducible Genes

Hajime Shiota, Rika Satoh, Ken-ichi Watabe, Hiroshi Harada and Hiroshi Kamada

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 11, pages 1184-1193
Published in print November 1998 | ISSN: 0032-0781
Published online November 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029319
C-ABI3, the Carrot Homologue of the Arabidopsis ABI3, is Expressed during Both Zygotic and Somatic Embryogenesis and Functions in the Regulation of Embryo-Specific ABA-Inducible Genes

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A carrot gene homologous to the ABI3 gene of Arabidopsis was isolated from a carrot somatic embryo cDNA library and designated C-ABI3. The sequence of C-ABI3 was very similar to those of ABI3 of Arabidopsis and VP1 of maize in certain conserved regions. The expression of C-ABI3 was detected specifically in embryogenic cells, somatic embryos and developing seeds. Thus, expression of C-ABI3 was limited to tissues that acquired desiccation tolerance in response to endogenous or exogenous abscisic acid (ABA). Endogenous levels of ABA in seeds increased transiently and then desiccation of seeds started. The expression of C-ABI3 in developing seeds was observed prior to the increase in levels of endogenous ABA that was followed by desiccation of seeds. In transgenic mature leaves in which C-ABI3 was ectopically expressed, expression of ECP31, ECP63 and ECP40 was induced by treatment with ABA, which indicates that the expression of ECP genes was controlled by the pathway(s) that involved C-ABI3 and ABA. This suggests that C-ABI3 has the same function as VP1/ABI3 factor in carrot somatic embryos.

Keywords: Abscisic acid; C-ABI3 gene; Carrot (Daucus carota); ECP gene; Seed development; Somatic embryogenesis

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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