The physiological basis of genotypic differences in nitrogen use efficiency in oilseed rape (Brassica napus L.)
The physiological basis of genotypic differences in nitrogen use efficiency in oilseed rape (Brassica napus L.)
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DOI：
10.1016/j.fcr.2010.08.004
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发表时间：
2010-11-01
影响因子：
5.8
通讯作者：
White, P. J.
中科院分区：
文献类型：
--
作者：
Berry, P. M.;Spink, J.;White, P. J.
在2007年和2008年收获季节，在英国进行了四次田间试验。每个实验包括10个冬油菜品种在低水平的有效氮（N）和高水平的有效氮旨在复制商业实践。综合分析三个试验与显着的产量差异的N处理之间的氮的有效性和品种的产量之间的显着的相互作用。在这三个试验中，作物在低氮条件下生长与高氮条件下生长相比，产量损失的比例在品种之间从0.23到0.35不等。低氮条件下的产量损失比例与作物吸氮量呈负相关。在这三个试验中，氮素利用效率（kg种子干物质/kg速效氮）也存在着供氮与品种间的交互作用。低氮条件下品种间的产量差异与作物吸氮量、最终作物干物质和每平方米种子数密切相关，但与氮利用率（每千克吸氮量的千克种子数）无关。在低氮条件下，作物每增加1 kg氮，产量增加0.020 t/ha。开花后吸收的氮量是决定品种间产量差异的最重要的氮吸收阶段，开花后每增加1千克氮，产量增加0.016吨/公顷。每增加1000粒种子/m2，开花后每公顷吸收1.4公斤氮。在低氮或氮吸收后期的产量和单个种子大小之间没有相关性。(C)2010 Elsevier B. V.保留所有权利。
Four field experiments were performed in the UK in harvest seasons 2007 and 2008. Each experiment consisted of 10 winter oilseed rape varieties grown at a low level of available nitrogen (N) and at a high level of available N intended to replicate commercial practice. A combined analysis of three of the experiments with significant yield differences between the N treatments showed a significant interaction between N availability and variety for yield. Across these three experiments the proportion of yield lost when crops were grown at low N compared with high N ranged from 0.23 to 0.35 among varieties. The proportion of yield lost at low N was negatively associated with crop N uptake. There was also an interaction between N supply and variety for N use efficiency (kg of seed dry matter/kg available N) within these three experiments. Varietal differences in yield at low N correlated most closely, and positively, with crop N uptake, final crop dry matter and seeds/m(2), but not N utilisation (kg seed/kg N uptake). Every additional kilogram of N taken up by the crop increased yield at low N by 0.020 t/ha. The amount of N taken up after flowering was the most important phase of N uptake for determining yield differences between the varieties, with every additional kilogram of N taken up after flowering associated with a yield increase of 0.016 t/ha. Each additional 1000 seeds/m(2) was associated with an additional 1.4 kg N/ha taken up after flowering. There was no correlation between yield at low N or late N uptake and individual seed size. (C) 2010 Elsevier B.V. All rights reserved.