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Nitrate supply affects root growth differentially in two rice cultivars differing in nitrogen use efficiency

Nitrate supply affects root growth differentially in two rice cultivars differing in nitrogen use efficiency,10.1007/s11104-011-0723-0,Plant and Soil,

Nitrate supply affects root growth differentially in two rice cultivars differing in nitrogen use efficiency  
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Partial nitrate nutrition was testified to improve rice (Oryza sativa L.) growth. However, how partial nitrate nutrition is related to root growth in rice cultivars with different N-use efficiency is still unclear. Two rice cultivars, Nanguang (high N-use efficiency) and Elio (low N-use efficiency), were grown on six ratios of NH4+/NO3- in the solution. The response of root growth to partial nitrate nutrition was investigated and N status and auxin concentration were recorded in order to elucidate the mechanisms by which the optimal ratio of NH4+/NO3- that controls the architecture of the root system. The length of adventitious and lateral roots was stimulated only in cv. Nanguang by partial nitrate nutrition. Nitrate-stimulated root length in Nanguang resulted mainly from root initiation rather than root elongation. Root biomass was similar between two rice cultivars under NH4+ supplied, while higher root biomass was observed in cv. Nanguang than in cv. Elio under 25% nitrate supplied for 10 weeks. Significant IAA increase was recorded in cv. Nanguang under 25% nitrate presence in the nutrition compared to under sole NH4+ solution. The presence of nitrate increased root initiation in the rice with high N-use efficiency, which led to faster biomass accumulation and higher N-use efficiency at later growth stages.
Journal: Plant and Soil - PLANT SOIL , vol. 343, no. 1, pp. 357-368, 2011
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