Plant and Soil

, Volume 316, Issue 1–2, pp 25–34 | Cite as

Genotypic differences in root hydraulic conductance of rice (Oryza sativa L.) in response to water regimes

  • Naoki MatsuoEmail author
  • Kiyoshi Ozawa
  • Toshihiro Mochizuki
Regular Article


To determine water uptake by rice in water-saving culture, we examined root hydraulic conductance (L 0), plant growth, and root anatomy of three rice genotypes (Oryza sativa L. ssp. indica cv. Beodien, traditional upland; ssp. japonica cv. Sensho, traditional upland; ssp. japonica cv. Koshihikari, improved lowland) under three water regimes: water-saturated (hydroponic), well-irrigated aerobic (control), and water-saving aerobic in soil. In hydroponic culture, although shoot dry weight (SDW) and root number were the largest in Sensho, root L 0 was the highest in Koshihikari. There was no significant relationship between root L 0 and SDW in hydroponics, so root L 0 might not limit shoot growth under flooding. Root L 0 was much less in soil than in hydroponics, and that of Koshihikari was the lowest, especially in water-saving conditions. Root L 0 was highly correlated with SDW under water-saving conditions but not in the control, so root L 0 limits shoot growth under repeated water stress. Root anatomy was less affected by water regime than root L 0 and is genetically controlled. Thus, root L 0 may be more affected by water channels than by root anatomy.


Hydroponic culture Lowland rice Root hydraulic conductance Soil culture Upland rice Water-saving culture 


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Naoki Matsuo
    • 1
    Email author
  • Kiyoshi Ozawa
    • 2
  • Toshihiro Mochizuki
    • 3
  1. 1.Graduate School of Bioresource and Bioenvironmental SciencesKyushu UniversityFukuokaJapan
  2. 2.Tropical Agriculture Research FrontJapan International Research Center for Agricultural SciencesIshigakiJapan
  3. 3.Faculty of AgricultureKyushu UniversityFukuokaJapan

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