Abstract
Ubiquitous cell membrane proteins called aquaporins are members of major intrinsic proteins (MIPs), which control the specific transport of water molecules across cell membranes. A pepper aquaporin gene (CaAQP), which exhibits the structural features of tonoplast intrinsic proteins of the MIP subfamily, was isolated from the leaves of chilling-treated seedlings of pepper (Capsicum annuum L.) cv. P70. Assays indicated high levels of expression in young seeds, green fruits and flower buds and low levels of expression in the stems, leaves and roots of pepper. The expression patterns were strongly and rapidly induced by HgCl2, low temperature, abscisic acid, fluridone and osmotic stresses. The responsiveness of pepper seedlings pretreated with abscisic acid at low temperatures demonstrated up-regulation of CaAQP by chilling, which is potentially involved in ABA signalling. Our results indicated that overexpression of CaAQP decreased chilling stress in transgenic plants, likely by increasing the stomatal aperture under stress, increasing the rate of membrane damage during the recovery stage, thereby affecting the intercellular CO2 concentration with lower stomatal conductance and transpiration rates. VIGS of CaAQP in pepper plants caused significant growth retardation. These results suggested that CaAQP played a crucial role in the plant response to abiotic stresses.
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Abbreviations
- CaMV:
-
Cauliflower mosaic virus
- Ci:
-
Intercellular CO2 concentrations
- GIPs:
-
GlpF-like intrinsic proteins
- Gs:
-
Stomatal conductance
- HIPs:
-
Hybrid intrinsic proteins
- L0 :
-
Root hydraulic conductance
- MIPs:
-
Major intrinsic proteins
- NIPs:
-
Nodulin26-like intrinsic proteins
- NtL25 :
-
L25 ribosomal protein
- PIPs:
-
Plasma membrane intrinsic proteins
- Pn:
-
Net photosynthetic rate
- PSV:
-
Protein storage vacuoles
- RACE:
-
Rapid amplification of cDNA ends
- RCBD:
-
Randomized complete block design
- REL:
-
Relative electrolyte leakage
- RWC:
-
Relative water content
- SA:
-
Salicylic acid
- SIPs:
-
Small basic intrinsic proteins
- SE:
-
Standard error
- TDFs:
-
Transcript-derived fragments
- TIPs:
-
Tonoplast intrinsic proteins
- Tr:
-
Transpiration rate
- TMHs:
-
Transmembrane helices
- UTR:
-
Non-coding region
- XIPs:
-
Uncharacterized X intrinsic proteins
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 31201615, 31272163), “The Twelfth Five-Year” Plan of National Science and Technology in Rural Areas (No. 2011BAD12B03) and the Shaanxi Provincial Science and Technology Coordinating Innovative Engineering Project (No. 2012KTCL02-09). Language help was provided by Elsevier Webshop language services.
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Yin, YX., Guo, WL., Zhang, YL. et al. Cloning and characterisation of a pepper aquaporin, CaAQP, which reduces chilling stress in transgenic tobacco plants. Plant Cell Tiss Organ Cult 118, 431–444 (2014). https://doi.org/10.1007/s11240-014-0495-3
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DOI: https://doi.org/10.1007/s11240-014-0495-3