Abstract
The world population continually faces challenges of water scarcity for agriculture. A common strategy called water-balance control has evolved to adapt plant growth to these challenges. Aquaporins are a family of integral membrane proteins that play a central role in water-balance control. In this study, we identified 34 members of the rice aquaporin gene family, adding a novel member to the previous list. A combination of phylogenetic tree and anatomical meta-expression profiling data consisting of 983 Affymetrix arrays and 209 Agilent 44 K arrays was used to identify tissue-preferred aquaporin genes and evaluate functional redundancy among aquaporin family members. Eight aquaporins showed root-preferred expression in the vegetative growth stage, while 4 showed leaf/shoot-preferred expression. Integrating stress-induced expression patterns into phylogenetic tree and semi-quantitative reverse transcriptase polymerase chain reaction (RT-PCR) analyses revealed that 3 rice aquaporin genes were markedly downregulated and 4 were upregulated by water deficiency in the root, suggesting that these candidate genes are key regulators of water uptake from the soil. Finally, we constructed a functional network of genes mediated by water stress and refined the network by confirming the differential expression using RT-PCR and real-time PCR. Our data will be useful to elucidate the molecular mechanism of water-balance control in rice root.
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Abbreviations
- AQP:
-
Aquaporin
- D:
-
Day(s)
- IDs:
-
Identifiers
- H:
-
Hour(s)
- Lsi:
-
Low silicon rice
- MEGA:
-
Molecular evolutionary genetics analysis
- Min:
-
Minute(s)
- NIPs:
-
Nodulin 26-like intrinsic proteins
- NPA:
-
Asparagine–proline–alanine region
- PIPs:
-
Plasma membrane intrinsic proteins
- qRT-PCR:
-
Semi-quantitative reverse transcription polymerase chain reaction
- RGAP:
-
Rice genome annotation project database
- RWC:
-
Rice water channel
- SAM:
-
Shoot apical meristem
- S:
-
Second(s)
- SIPs:
-
Small basic intrinsic proteins
- TIPs:
-
Tonoplast intrinsic proteins
- XIPs:
-
Uncategorized X intrinsic proteins
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Acknowledgments
This work was supported by the Next-Generation BioGreen 21 Program of South Korea (PJ008079 and PJ008173) to KHJ and a Young Scientist Program through the National Research Foundation of Korea (Grant no. 20120003801) to KHJ.
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425_2013_1918_MOESM4_ESM.jpg
Fig. S4 Anatomical expression of rice aquaporin genes using 1150 Affymetrix and 209 Agilent 44 K arrays. A black bar denotes an indica cultivar and a grey bar a japonica cultivar (JPEG 1598 kb)
425_2013_1918_MOESM6_ESM.docx
Table S2 Primer sequences for RT-PCR and real-time PCR of aquaporin genes and genes functionally associated with aquaporins, used in Figs. 2, 4, and 5 (DOCX 19 kb)
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Nguyen, M.X., Moon, S. & Jung, KH. Genome-wide expression analysis of rice aquaporin genes and development of a functional gene network mediated by aquaporin expression in roots. Planta 238, 669–681 (2013). https://doi.org/10.1007/s00425-013-1918-9
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DOI: https://doi.org/10.1007/s00425-013-1918-9