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Linking wheat nitrogen use to root traits: Shallow and thin embryonic roots enhance uptake but reduce conversion efficiency of nitrogen
Field Crops Research ( IF 5.8 ) Pub Date : 2022-06-18 , DOI: 10.1016/j.fcr.2022.108603
Hui Liu, Tino Colombi, Ortrud Jäck, Anna Westerbergh, Martin Weih

Nitrogen (N) is considered quantitatively most important for crop growth and productivity. The improvement of crop N use efficiency is economically beneficial to farmers and reduces the negative environmental impact of agriculture. Root traits are promising, yet underexploited breeding targets to improve N use efficiency. We aimed to evaluate (1) the effects of genotype and environment on N use efficiency and various root architectural and anatomical traits; and (2) the relationships between root traits, N uptake and conversion efficiency. Nine spring wheat genotypes were grown on compacted and non-compacted soil during two years with contrasting weather conditions in Central Sweden. Wheat genotype and year caused considerable variation in several root and N use efficiency traits. Negative correlations were found between N uptake efficiency and N conversion efficiency; root number and diameter; root number and angle; and metaxylem number and diameter. The N uptake efficiency increased with shallower root angle, higher root number, smaller root diameter, higher metaxylem number and smaller metaxylem diameter; whilst N conversion efficiency showed the opposite pattern. We conclude that a negative relationship observed between N uptake efficiency and N conversion efficiency can be linked to trade-offs between embryonic root traits.



中文翻译:

将小麦氮利用与根系性状联系起来:浅而薄的胚根增强了吸收,但降低了氮的转化效率

氮 (N) 在数量上被认为对作物生长和生产力最重要。作物氮利用效率的提高对农民来说是经济上有利的,并减少了农业对环境的负面影响。根性状是有希望的,但尚未充分利用育种目标来提高氮利用效率。我们旨在评估 (1) 基因型和环境对氮利用效率和各种根结构和解剖特征的影响;(2)根系性状、N吸收和转化效率之间的关系。在瑞典中部气候条件不同的两年中,九种春小麦基因型在压实和非压实土壤上种植。小麦基因型和年份在几个根和氮利用效率性状中造成了相当大的变化。氮吸收效率与氮转化效率呈负相关;根数和直径;根数和角度;和间木质部的数量和直径。根角越小、根数越多、根径越小、间木质部数越多、间木质部直径越小,吸氮效率越高;而 N 转换效率显示相反的模式。我们得出结论,在 N 吸收效率和 N 转化效率之间观察到的负相关关系可能与胚根性状之间的权衡有关。而 N 转换效率显示相反的模式。我们得出结论,在 N 吸收效率和 N 转化效率之间观察到的负相关关系可能与胚根性状之间的权衡有关。而 N 转换效率显示相反的模式。我们得出结论,在 N 吸收效率和 N 转化效率之间观察到的负相关关系可能与胚根性状之间的权衡有关。

更新日期:2022-06-19
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