Aquaporin OsPIP1;1 promotes rice salt resistance and seed germination

Chengwei Liu, Tatsuya Fukumoto, Tadashi Matsumoto, Patrizia Gena, Daniele Frascaria, Tomoyuki Kaneko, Maki Katsuhara, Shihua Zhong, Xiaoli Sun, Yanming Zhu, Ikuko Iwasaki, Xiaodong Ding, Giuseppe Calamita, Yoshichika Kitagawa

    Research output: Contribution to journalArticlepeer-review

    98 Citations (Scopus)

    Abstract

    OsPIP1;1 is one of the most abundant aquaporins in rice leaves and roots and is highly responsible to environmental stresses. However, its biochemical and physiological functions are still largely unknown. The oocyte assay data showed OsPIP1;1 had lower water channel activity in contrast to OsPIP2;1. EGFP and immunoelectron microscopy studies revealed OsPIP1;1 was predominantly localized in not only plasma membrane but also in some ER-like intracellular compartments in the cells. OsPIP1;1 exhibited low water channel activity in Xenopus oocytes but coexpression of OsPIP2;1 significantly enhanced its water permeability. Stop-flow assay indicated that 10His-OsPIP1;1-reconstituted proteoliposomes had significantly higher water permeability than the control liposomes. Overexpression of OsPIP1;1 greatly altered many physiological features of transgenic plants in a dosage-dependent manner. Moderate expression of OsPIP1;1 increased rice seed yield, salt resistance, root hydraulic conductivity, and seed germination rate. This work suggests OsPIP1;1 functions as an active water channel and plays important physiological roles.

    Original languageEnglish
    Pages (from-to)151-158
    Number of pages8
    JournalPlant Physiology and Biochemistry
    Volume63
    DOIs
    Publication statusPublished - Feb 2013

    Keywords

    • Aquaporin
    • Cellular localization
    • Salt resistance
    • Seed germination
    • Seed yield
    • Water permeability

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science

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