Influence of Low Air Humidity and Low Root Temperature on Water Uptake, Growth and Aquaporin Expression in Rice Plants
| Autor: | Keiko Fukushi, Maki Katsuhara, Mari Murai-Hatano, Katsuko Takasugi, Tsuneo Kuwagata, Arifa Ahamed, Hidehiro Hayashi, Kiyoshi Nagasuga, Junko Ishikawa-Sakurai |
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| Rok vydání: | 2012 |
| Předmět: |
Physiology
Aquaporin Plant Science Aquaporins Plant Roots Gene Expression Regulation Plant Water uptake Dry matter Water-use efficiency Plant Proteins Transpiration Oryza sativa biology Chemistry Membrane Proteins Water food and beverages Humidity Oryza Plant Transpiration Cell Biology General Medicine biology.organism_classification humanities Cold Temperature Plant Leaves Agronomy Seedlings Seedling Plant Stomata |
| Zdroj: | Plant and Cell Physiology. 53:1418-1431 |
| ISSN: | 1471-9053 0032-0781 |
| DOI: | 10.1093/pcp/pcs087 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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