Abstract:
:Plasma membrane intrinsic proteins (PIPs) are one subfamily of aquaporins that mediate the transmembrane transport of water. To reveal their function in poplar, we generated transgenic poplar plants in which the translation of PIP genes was downregulated by RNA interference investigated these plants with a comprehensive leaf plasma membrane proteome and physiome analysis. First, inhibition of PIP synthesis strongly altered the leaf plasma membrane protein composition. Strikingly, several signaling components and transporters involved in the regulation of stomatal movement were differentially regulated in transgenic poplars. Furthermore, hormonal crosstalk related to abscisic acid, auxin and brassinosteroids was altered, in addition to cell wall biosynthesis/cutinization, the organization of cellular structures and membrane trafficking. A physiological analysis confirmed the proteomic results. The leaves had wider opened stomata and higher net CO2 assimilation and transpiration rates as well as greater mesophyll conductance for CO2 (gm) and leaf hydraulic conductance (Kleaf). Based on these results, we conclude that PIP proteins not only play essential roles in whole leaf water and CO2 flux but have important roles in the regulation of stomatal movement.
journal_name
J Proteomicsjournal_title
Journal of proteomicsauthors
Bi Z,Merl-Pham J,Uehlein N,Zimmer I,Mühlhans S,Aichler M,Walch AK,Kaldenhoff R,Palme K,Schnitzler JP,Block Kdoi
10.1016/j.jprot.2015.07.029subject
Has Abstractpub_date
2015-10-14 00:00:00pages
321-32eissn
1874-3919issn
1876-7737pii
S1874-3919(15)30082-8journal_volume
128pub_type
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