Barley plasma membrane intrinsic proteins (PIP Aquaporins) as water and CO2 transporters

Maki Katsuhara, Yuko T. Hanba

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


We identified barley aquaporins and demonstrated that one, HvPIP2;1, transports water and CO2. Regarding water homeostasis in plants, regulations of aquaporin expression were observed in many plants under several environmental stresses. Under salt stress, a number of plasma membrane-type aquaporins were down-regulated, which can prevent continuous dehydration resulting in cell death. The leaves of transgenic rice plants that expressed the largest amount of HvPIP2;1 showed a 40% increase in internal CO2 conductance compared with leaves of wild-type rice plants. The rate of CO 2 assimilation also increased in the transgenic plants. The goal of our plant aquaporin research is to determine the key aquaporin species responsible for water and CO2 transport, and to improve plant water relations, stress tolerance, CO2 uptake or assimilation, and plant productivity via molecular breeding of aquaporins.

Original languageEnglish
Pages (from-to)687-691
Number of pages5
JournalPflugers Archiv European Journal of Physiology
Issue number4
Publication statusPublished - Jul 2008


  • Barley
  • CO
  • Plant aquaporins
  • Salt stress
  • Water transport

ASJC Scopus subject areas

  • Physiology
  • Clinical Biochemistry
  • Physiology (medical)


Dive into the research topics of 'Barley plasma membrane intrinsic proteins (PIP Aquaporins) as water and CO2 transporters'. Together they form a unique fingerprint.

Cite this