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

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Abstract

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.

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Authors and Affiliations

  1. Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 111 Harumachi, Kasuya-cho, Kasuya-gun, Fukuoka, 811-2307, Japan

    Naoki Matsuo

  2. Tropical Agriculture Research Front, Japan International Research Center for Agricultural Sciences, 1091-1, Maezato-Kawarabaru, Ishigaki, Okinawa, 907-0002, Japan

    Kiyoshi Ozawa

  3. Faculty of Agriculture, Kyushu University, 111 Harumachi, Kasuya-cho, Kasuya-gun, Fukuoka, 811-2307, Japan

    Toshihiro Mochizuki

Authors
  1. Naoki Matsuo
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  2. Kiyoshi Ozawa
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  3. Toshihiro Mochizuki
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Correspondence to Naoki Matsuo.

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Responsible Editor: Hans Lambers.

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Matsuo, N., Ozawa, K. & Mochizuki, T. Genotypic differences in root hydraulic conductance of rice (Oryza sativa L.) in response to water regimes. Plant Soil 316, 25–34 (2009). https://doi.org/10.1007/s11104-008-9755-5

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