Influence of low air humidity and low root temperature on water uptake, growth and aquaporin expression in rice plants

Tsuneo Kuwagata, Junko Ishikawa-Sakurai, Hidehiro Hayashi, Kiyoshi Nagasuga, Keiko Fukushi, Arifa Ahamed, Katsuko Takasugi, Maki Katsuhara, Mari Murai-Hatano

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Abstract

The effects of low air humidity and low root temperature (LRT) on water uptake, growth and aquaporin gene expression were investigated in rice plants. The daily transpiration of the plants grown at low humidity was 1.5- to 2-fold higher than that at high humidity. LRT at 13°C reduced transpiration, and the extent was larger at lower humidity. LRT also reduced total dry matter production and leaf area expansion, and the extent was again larger at lower humidity. These observations suggest that the suppression of plant growth by LRT is associated with water stress due to decreased water uptake ability of the root. On the other hand, the net assimilation rate was not affected by low humidity and LRT, and water use efficiency was larger for LRT. We found that low humidity induced coordinated up-regulation of many PIP and TIP aquaporin genes in both the leaves and the roots. Expression levels of two root-specific aquaporin genes, OsPIP2;4 and OsPIP2;5, were increased significantly after 6 and 13 d of LRT exposure. Taken together, we discuss the possibility that aquaporins are part of an integrated response of this crop to low air humidity and LRT.

Original languageEnglish
Pages (from-to)1418-1431
Number of pages14
JournalPlant and Cell Physiology
Volume53
Issue number8
DOIs
Publication statusPublished - Aug 1 2012

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Keywords

  • Aquaporin
  • Growth
  • Low humidity
  • Low root temperature
  • Oryza sativa (rice)

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

Cite this

Kuwagata, T., Ishikawa-Sakurai, J., Hayashi, H., Nagasuga, K., Fukushi, K., Ahamed, A., Takasugi, K., Katsuhara, M., & Murai-Hatano, M. (2012). Influence of low air humidity and low root temperature on water uptake, growth and aquaporin expression in rice plants. Plant and Cell Physiology, 53(8), 1418-1431. https://doi.org/10.1093/pcp/pcs087