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Cloning and characterisation of a pepper aquaporin, CaAQP, which reduces chilling stress in transgenic tobacco plants

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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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Correspondence to Zhen-Hui Gong.

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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

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