Abstract
A cDNA library was constructed from the root tissues of cassava variety Huanan 124 at the root bulking stage. A total of 9,600 cDNA clones from the library were sequenced with single-pass from the 5′-terminus to establish a catalogue of expressed sequence tags (ESTs). Assembly of the resulting EST sequences resulted in 2,878 putative unigenes. Blastn analysis showed that 62.6% of the unigenes matched with known cassava ESTs and the rest had no ‘hits’ against the cassava database in the integrative PlantGDB database. Blastx analysis showed that 1,715 (59.59%) of the unigenes matched with one or more GenBank protein entries and 1,163 (40.41%) had no ‘hits’. A cDNA microarray with 2,878 unigenes was developed and used to analyze gene expression profiling of Huanan 124 at key growth stages including seedling, formation of root system, root bulking, and starch maturity. Array data analysis revealed that (1) the higher ratio of up-regulated ribosome-related genes was accompanied by a high ratio of up-regulated ubiquitin, proteasome-related and protease genes in cassava roots; (2) starch formation and degradation simultaneously occur at the early stages of root development but starch degradation is declined partially due to decrease in UDP-glucose dehydrogenase activity with root maturity; (3) starch may also be synthesized in situ in roots; (4) starch synthesis, translocation, and accumulation are also associated probably with signaling pathways that parallel Wnt, LAM, TCS and ErbB signaling pathways in animals; (5) constitutive expression of stress-responsive genes may be due to the adaptation of cassava to harsh environments during long-term evolution.
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Abbreviations
- ADPGPase:
-
ADP glucose pyrophosphorylase
- Ar.:
-
Arachis
- DAP:
-
Days after planting
- dbEST:
-
Database of EST
- ErbB:
-
Epidermal growth factor family of receptor tyrosine kinase
- EST:
-
Expressed sequence tag
- GBSS:
-
Granule-bound SS
- GO:
-
Gene ontology
- Hy.:
-
Hyacinthus
- JAK-STAT:
-
Janus kinase-signal transducer and activator of transcription
- KEGG:
-
Kyoto encyclopedia of genes and genomes
- LAM:
-
Linoleic acid metabolism
- ln:
-
Natural logarithm
- MAPK:
-
Mitogen-activated protein kinase
- Mer.:
-
Mercurialis
- mTOR:
-
Mammalian target of rapamycin
- nARVOL:
-
Normalized AR volume
- Pis.:
-
Pisum
- qRT-PCR:
-
Quantitative real-time PCR
- rpm:
-
Revolutions per minute
- SBE:
-
Starch branching enzyme
- Sp.:
-
Spinacia
- SS:
-
Starch synthase
- sV:
-
Subtracted value
- TCS:
-
Two-component system
- TGF beta:
-
Transforming growth factor beta
- VEGF:
-
Vascular endothelial growth factor
- Wnt:
-
Wingless
- YT:
-
Yeast trypton
- Z.:
-
Zea
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Acknowledgments
This work was supported by The Pilot Project of the China National Key Program for Fundamental Research (2004CCA00600) and The Project of the China National Key Program for Fundamental Research (2010CB126601).
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DNA sequences of all ESTs used in this study have been deposited at http://www.ncbi.nlm.nih.gov/dbEST with accession number from FG804688 to FG807563.
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Li, YZ., Pan, YH., Sun, CB. et al. An ordered EST catalogue and gene expression profiles of cassava (Manihot esculenta) at key growth stages. Plant Mol Biol 74, 573–590 (2010). https://doi.org/10.1007/s11103-010-9698-0
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DOI: https://doi.org/10.1007/s11103-010-9698-0