Root plasticity and its functional roles were triggered by water deficit but not by the resulting changes in the forms of soil N in rice

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• 作者：Thiem Thi Tran (1) (2)
  Mana Kano-Nakata (3)
  Roel Rodriguez Suralta (1) (4)
  Daniel Menge (1)
  Shiro Mitsuya (1)
  Yoshiaki Inukai (3)
  Akira Yamauchi (1)
  
• 关键词：Ammonium ; Chromosome segment substitution lines ; Dry matter production ; Nitrate ; Root plasticity ; Water deficit
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：386
• 期：1-2
• 页码：65-76
• 全文大小：611 KB
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  14. Kamoshita A, Rodriguez R, Yamauchi A, Wade LJ (2004) Genotypic varia- tion in response of rainfed lowland rice to prolonged drought and rewatering. Plant Prod Sci 7:406-20 CrossRef
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  16. Kano M, Inukai Y, Kitano H, Yamauchi A (2011) Root plasticity as the key root trait for adaptation to various intensities of drought stress in rice. Plant Soil 342:117-28 CrossRef
  17. Kano-Nakata M, Inukai Y, Wade LJ, Siopongco JDLC, Yamauchi A (2011) Root development and water uptake, and shoot dry matter production under water deficit conditions in two CSSLs of rice: functional roles of root plasticity. Plant Prod Sci 14:307-17 CrossRef
  18. Kano-Nakata M, Suralta RR, Niones JM, Yamauchi A
• 作者单位：Thiem Thi Tran (1) (2)
  Mana Kano-Nakata (3)
  Roel Rodriguez Suralta (1) (4)
  Daniel Menge (1)
  Shiro Mitsuya (1)
  Yoshiaki Inukai (3)
  Akira Yamauchi (1)
  
  1. Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
  2. Faculty of Agronomy, Vietnam National University of Agriculture, Gialam, Hanoi, Vietnam
  3. International Cooperation Center for Agricultural Education, Nagoya University, Chikusa, Nagoya, 464-8601, Japan
  4. Agronomy, Soils and Plant Physiology Division, Philippine Rice Research Institute (PhilRice), Maligaya, Science City of Mu?oz, Nueva Ecija, 3119, Philippines
  
• ISSN：1573-5036

文摘

Background The functional roles of root plasticity in rice adaptation to drought conditions may vary with soil nitrogen (N) conditions. Aims To examine if: promoted root system plastic development triggered by mild drought stress and enhanced by N application would contribute to the increase in soil water uptake, and if expression of root system plasticity would be affected by different forms of N applied into the soil. Methods Chromosome segment substitution line (CSSL) 50 and Nipponbare genotypes were grown under continuously waterlogged (CWL) and water deficit (WD) conditions. In rootbox (25?cm?×-0?cm?×-?cm) experiment, three fertilizer N levels; (30 (low), 60 (standard) and 120?mg?N (high) per rootbox) were used while in pot (5?L) experiment, six N forms (NH4 +-N alone, NO3 ?/sup>-N alone, combined NH4 +-N and NO3 ?/sup>-N with and without dicyandiamide (nitrification inhibitor) were used at the rate of 360?mg?N per pot. Results In both experiments, CSSL50 and Nipponbare had no significant differences in shoot and root growth regardless of N levels and N forms under CWL conditions. However, under WD conditions, CSSL50 had significantly greater dry matter production (DMP) than Nipponbare due to the greater ability of the former for maintaining soil water uptake and photosynthesis. The observed higher water uptake and photosynthesis in CSSL50 under WD was closely related to its promoted root system development due to plasticity, which were significantly greater at high N than at low N level. The extent of promotion in root system development based total root length was not significantly different among N forms. Conclusions The root system plasticity of CSSL50 in response to WD was expressed at a greater degree with high level of N applied and the functional roles of root plasticity for greater soil water uptake and DMP were due to WD regardless of N forms.