caa a22 4500 606219846 CHVBK 20210128101120.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s11104-014-2240-4 doi (NATIONALLICENCE)springer-10.1007/s11104-014-2240-4 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 [Elektronische Daten] [Thiem Tran, Mana Kano-Nakata, Roel Suralta, Daniel Menge, Shiro Mitsuya, Yoshiaki Inukai, Akira Yamauchi] 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 (25cm × 40cm × 2cm) experiment, three fertilizer N levels; (30 (low), 60 (standard) and 120mgN (high) per rootbox) were used while in pot (5L) experiment, six N forms (NH4 +-N alone, NO3 −-N alone, combined NH4 +-N and NO3 −-N with and without dicyandiamide (nitrification inhibitor) were used at the rate of 360mgN 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. Springer International Publishing Switzerland, 2014 Ammonium nationallicence Chromosome segment substitution lines nationallicence Dry matter production nationallicence Nitrate nationallicence Root plasticity nationallicence Water deficit nationallicence CSSLs : chromosome segment substitution lines nationallicence DAS : days after sowing nationallicence SMC : soil moisture content nationallicence CWL : continuously waterlogged nationallicence WD : water deficit nationallicence N : nitrogen nationallicence G : genotype nationallicence DMP : dry matter production nationallicence Tran Thiem Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut Kano-Nakata Mana International Cooperation Center for Agricultural Education, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut Suralta Roel Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut Menge Daniel Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut Mitsuya Shiro Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut Inukai Yoshiaki International Cooperation Center for Agricultural Education, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut Yamauchi Akira Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut Plant and Soil Springer International Publishing 386/1-2(2015-01-01), 65-76 0032-079X 386:1-2<65 2015 386 11104 https://doi.org/10.1007/s11104-014-2240-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-014-2240-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tran Thiem Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut NATIONALLICENCE 700 1- Kano-Nakata Mana International Cooperation Center for Agricultural Education, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut NATIONALLICENCE 700 1- Suralta Roel Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut NATIONALLICENCE 700 1- Menge Daniel Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut NATIONALLICENCE 700 1- Mitsuya Shiro Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut NATIONALLICENCE 700 1- Inukai Yoshiaki International Cooperation Center for Agricultural Education, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut NATIONALLICENCE 700 1- Yamauchi Akira Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601, Nagoya, Japan aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 386/1-2(2015-01-01), 65-76 0032-079X 386:1-2<65 2015 386 11104