Genome-wide identification, characterization, and expression profile of aquaporin gene family in flax (Linum usitatissimum)

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作者
S. M. Shivaraj
Rupesh K. Deshmukh
Rhitu Rai
Richard Bélanger
Pawan K. Agrawal
Prasanta K. Dash
机构
[1] ICAR-NRC on Plant Biotechnology,
[2] PUSA,undefined
[3] Departement de Phytologie,undefined
[4] University Laval,undefined
[5] Quebec,undefined
[6] National Agricultural Science Fund (NASF),undefined
[7] PUSA,undefined
[8] ICAR,undefined
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Scientific Reports | / 7卷
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摘要
Membrane intrinsic proteins (MIPs) form transmembrane channels and facilitate transport of myriad substrates across the cell membrane in many organisms. Majority of plant MIPs have water transporting ability and are commonly referred as aquaporins (AQPs). In the present study, we identified aquaporin coding genes in flax by genome-wide analysis, their structure, function and expression pattern by pan-genome exploration. Cross-genera phylogenetic analysis with known aquaporins from rice, arabidopsis, and poplar showed five subgroups of flax aquaporins representing 16 plasma membrane intrinsic proteins (PIPs), 17 tonoplast intrinsic proteins (TIPs), 13 NOD26-like intrinsic proteins (NIPs), 2 small basic intrinsic proteins (SIPs), and 3 uncharacterized intrinsic proteins (XIPs). Amongst aquaporins, PIPs contained hydrophilic aromatic arginine (ar/R) selective filter but TIP, NIP, SIP and XIP subfamilies mostly contained hydrophobic ar/R selective filter. Analysis of RNA-seq and microarray data revealed high expression of PIPs in multiple tissues, low expression of NIPs, and seed specific expression of TIP3 in flax. Exploration of aquaporin homologs in three closely related Linum species bienne, grandiflorum and leonii revealed presence of 49, 39 and 19 AQPs, respectively. The genome-wide identification of aquaporins, first in flax, provides insight to elucidate their physiological and developmental roles in flax.
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