Modeling Plant Nitrogen Uptake and Grain Protein Accumulation in Rice
Modeling Plant Nitrogen Uptake and Grain Protein Accumulation in Rice
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模拟水稻植物氮吸收和谷物蛋白质积累
DOI：
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发表时间：
2011
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通讯作者：
Zhu Yan
中科院分区：
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作者：
C. Jie;Tang Liang;L. Xiaojun;Cao Weixing;Zhu Yan
【目的】籽粒蛋白质含量是水稻的重要品质指标，建立不同栽培条件下籽粒蛋白质含量和积累的过程模拟模型。【方法】在不同生态点、品种类型和施氮水平的田间试验基础上，通过模拟氮素在植株体内的同化和分配过程，定量分析了籽粒蛋白质积累与环境和遗传因素的基本关系。[结果]该模型认为，单粒氮素积累速率由源限制的氮素有效性和库限制的氮素积累速率共同决定，源限制的氮素有效性是花后营养器官对氮素的吸收和再利用的总和，而库限制的氮素积累速率则取决于潜在氮素积累速率和温度的交互作用，开花后氮素吸收量与粒重增长呈对数关系，营养器官氮素的再利用主要来源于叶片和茎中积累的氮素，开花前叶片和茎中氮素相对含量随播后累计生长天数的增加而线性增加，利用不同年份、不同生态点、不同品种、不同施氮量的独立数据对模型进行检验，模型拟合度与实测值的相关系数分别为0.968，0.980，0.974，0.970和0.976，RMSE分别为16.55%，13.24%，花前叶片和茎的吸氮量、花后籽粒吸氮量和花后叶片和茎的氮素转运量分别为9.53%、10.93%和9.29%，籽粒蛋白质含量的RMSE为7.82%，R2为0.930。[结论]基于水稻氮素同化与运转的模拟模型能够可靠地预测不同栽培条件下水稻植株氮素吸收与运转量、籽粒蛋白质含量与积累量，为稻米品质预测提供了定量工具。
【Objective】Grain protein content is an important quality index in rice.The objective of this study was to develop a process based simulation model for predicting the content and accumulation of grain protein under different cultural conditions.【Method】On the basis of the field experiments involving different eco-sites,cultivar types and nitrogen rates,the fundamental relationships between grain protein accumulation and environmental and genetic factors were quantified by modeling the processes of nitrogen assimilation and partitioning within plant.【Result】The model proposed that the rate of individual grain nitrogen accumulation was determined by the nitrogen availability restricted by source and nitrogen accumulation rate restricted by sink.Nitrogen availability of individual grain restricted by source was the sum of nitrogen uptake and remobilization from the vegetative organs post-anthesis,whereas nitrogen accumulation rate restricted by sink was dependent on potential nitrogen accumulation rate and interactive effects of temperature,water and nitrogen factors.Post-anthesis nitrogen uptake exhibited a logarithmic relationship to increasing grain weight.Nitrogen remobilization from the vegetative organs was provided from nitrogen accumulated in both leaves and stems.Relative nitrogen contents in leaves and stems pre-anthesis linearly increased with the accumulative growing degree-days after sowing,while those post-anthesis linearly decreased with the growing degree-days.The model was tested using the independent data sets of different years,eco-sites,cultivars,nitrogen rates,and it exhibited a good fit between the simulated and observed values,with the R2 of 0.968,0.980,0.974,0.970 and 0.976,and RMSE of 16.55%,13.24%,9.53%,10.93% and 9.29% for nitrogen uptake amounts of leaf and stem before anthesis,grain nitrogen uptake amount after anthesis,and nitrogen translocation amount of leaf and stem after anthesis,respectively,with the RMSE of 7.82% and R2 of 0.930 for grain protein content,respectively.【Conclusion】The simulation model based on nitrogen assimilation and translocation in rice could give a reliable prediction of plant nitrogen uptake and translocation amounts,and grain protein content and accumulation under different cultural conditions,which would provide a quantitative tool for grain quality prediction.