Abstract
Potato (Solanum tuberosum) tubers are underground storage organs covered by the skin or periderm, a suberized layer that protects inner flesh from dehydration and pathogens. Understanding the molecular processes associated with periderm formation is of great importance for a better knowledge of this protective tissue and for improving the storage life of tubers. Here, to isolate new candidate genes for potato periderm, a suppression subtractive hybridization library from potato skin was performed. This library yielded a comprehensive list of 108 candidate genes that were manually sorted in functional categories according to the main cellular and metabolic processes in periderm. As expected, the list contains Suberin and wax genes, including some genes with a demonstrated role in the biosynthesis of these cell wall aliphatic compounds. Moreover, Regulation and Stress and defence genes are highly abundant in the library in general agreement with previous potato skin proteomic studies. The putative function of the genes in periderm is discussed.
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Abbreviations
- ESTs:
-
Expressed sequence tag
- SSH:
-
Suppression subtractive hybridization
- POCI:
-
Potato Oligo Chip Initiative
- StKCS6:
-
Solanum tuberosum 3-Ketoacyl-CoA-synthase
- FHT:
-
Fatty ω-hydroxyacid/fatty alcohol hydroxycinnamoyl transferase
- LACS:
-
Long-chain acyl-CoA synthethase
- PAL:
-
Phenylalanine ammonia lyase
- F5H:
-
Ferulate 5 hydroxylase
- ROS:
-
Reactive oxygen species
- DEM:
-
Defective embryo meristem
- PCD:
-
Programmed cell death
- LTP:
-
Lipid transfer protein
- IQR:
-
Interquartile range
- Ct:
-
Threshold cycle
- RT-PCR:
-
Reverse transcription-polymerase chain reaction
- PCA:
-
Principal component analysis
- NCBI:
-
National Center for Biotechnology Information
- TAIR:
-
The Arabidopsis Information Resource
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Acknowledgments
The authors would like to thank the Laboratory of Genetics Ichthyology (Biology Department, University of Girona) for kindly lending the Real time Thermocycler. The authors are very grateful to Mr. J. Falgàs for providing potato material. This work was supported by funding from Spanish Ministerio de Ciencia y Tecnología (AGL2003-00416) and from the Ministerio de Innovación y Ciencia (AGL2009-13745).
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425_2011_1350_MOESM3_ESM.tif
Supplemental Fig. S1 Variation in the expression of six housekeeping genes in potato periderm and parenchymatic flesh. Threshold cycle (Ct) variation obtained by real time RT-PCR is presented as a box-and-whisker plot. Boxes indicate the 25/75 percentiles, and the line inside each square indicates the median. Whisker caps indicate 1.5-fold the interquartile range (IQR), and outliers are indicated by dots. Cyclophilin shows both the lowest standard deviation and lowest Ct values (TIFF 96 kb)
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Soler, M., Serra, O., Fluch, S. et al. A potato skin SSH library yields new candidate genes for suberin biosynthesis and periderm formation. Planta 233, 933–945 (2011). https://doi.org/10.1007/s00425-011-1350-y
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DOI: https://doi.org/10.1007/s00425-011-1350-y