Abstract
Arabinogalactan proteins (AGPs) are cell wall hydroxyproline-rich glycoproteins with diverse functions in plant growth and development. In this work the role of AGPs was comparatively studied in four developmental pathways that can be induced from centaury leaf explants—indirect somatic embryogenesis (ISE), indirect and direct shoot development (ISD and DSD) and direct root development (DRD). The addition of β-d-glucosyl Yariv (βGlcY) reagent, a synthetic phenylglycoside that specifically crosslinks AGPs, to the growth medium reduced the number of somatic embryos and adventitious buds formed per explant. The morphogenetic paths can be arranged in order of increasing sensitivity to βGlcY as: DRD (insensitive) < ISD < DSD ≪ ISE. The content of AGPs increased during all processes, but the accumulation of AGPs was the most rapid during ISE and when ISE and ISD occurred simultaneously. We have identified four centaury AGP transcripts, CeAGP1–CeAGP4, of which CeAGP1, 2 and 4 code for fasciclin-like AGPs. CeAGP3 is an AG peptide with conserved DUF1070 domain. Expression pattern of these genes indicated specific involvement of CeAGP1 in ISE and unspecific involvement of CeAGP3 in morphogenesis.
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Abbreviations
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- ab:
-
Adventitious bud
- AG:
-
Arabinogalactan
- AGP:
-
Arabinogalactan protein
- BM:
-
Basal medium
- CPPU:
-
N-(2-chloro-4-pyridyl)-N′-phenylurea
- CS:
-
Cleavage site
- DRD:
-
Direct root development
- DSE:
-
Direct somatic embryogenesis
- DSD:
-
Direct shoot development
- FLA:
-
Fasciclin-like AGPs
- GPI:
-
Glycosylphosphatidylinositol anchor
- GPIsp:
-
GPI-addition signal peptide
- ISE:
-
Indirect somatic embryogenesis
- ISD:
-
Indirect shoot development
- LSD:
-
Least significant difference test
- mAbs:
-
Monoclonal antibodies
- qPCR:
-
Quantitative polymerase chain reaction
- SE:
-
Somatic embryogenesis
- SP:
-
Signal peptide
- βGlcY:
-
β-d-Glucosyl Yariv reagent; 1,3,5-tris (4-β-d-glycopyranosyloxyphenylazo)-2,4,6-trihydroxybenzene
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Acknowledgments
This work is financially supported by the Serbian Ministry of Education, Science and Technological Development, Grants ON173024, ON173015 and ON174021. The authors thank Dr. Milan Dragićević for valuable discussions and critical review of the manuscript.
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Simonović, A.D., Filipović, B.K., Trifunović, M.M. et al. Plant regeneration in leaf culture of Centaurium erythraea Rafn. Part 2: the role of arabinogalactan proteins. Plant Cell Tiss Organ Cult 121, 721–739 (2015). https://doi.org/10.1007/s11240-015-0741-3
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DOI: https://doi.org/10.1007/s11240-015-0741-3