Does genotypic variation in nitrogen remobilisation efficiency contribute to nitrogen efficiency of winter oilseed-rape cultivars (Brassica napus L.)?
Does genotypic variation in nitrogen remobilisation efficiency contribute to nitrogen efficiency of winter oilseed-rape cultivars (Brassica napus L.)?
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氮再利用效率的基因型变异是否有助于冬季油菜品种（甘蓝型油菜）的氮效率？
DOI：
10.1007/s11104-013-1688-y
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发表时间：
2013
期刊：
影响因子：
4.9
通讯作者：
Schulte auf’m Erley G.
中科院分区：
文献类型：
--
作者：
Ulas A;Behrens T;Wiesler F;Schulte auf’m Erley G.
目的冬季油菜生产的特点是氮素利用率低，这是因为油菜对氮素的吸收较少，对种子的氮素再动员不足。特别是，减少叶片氮素损失可能是提高这种作物氮素效率的途径之一。方法在为期3年的田间试验中，对4个油菜品种在限氮、中氮和高氮条件下的氮素损失进行了研究。结果油菜氮素收获指数较高(0.79左右)，叶片氮素损失量最高可达13万kg/hm2，−为1.86%的叶片氮素在开花初期被重新动员。尽管如此，叶片氮素损失存在着遗传变异。这主要是由于开花前叶片氮素积累的差异所致。茎中残留氮(高达33万kg/hA−1)高于叶氮损失量，且在不同处理间差异较大，但与产量的遗传变异无关。结论在低氮和高氮条件下，花后氮素吸收比营养生物量的氮素再动员对种子产量的遗传变异更重要。
AimsWinter oilseed-rape production is characterized by a low N efficiency, due to low N uptake and insufficient N remobilisation to the seeds. In particular, a reduction of leaf N losses might be one way to improve N efficiency of this crop. It was tested if variations in leaf N losses and in stem residual N amounts at maturity exist between cultivars differing in N efficiency.MethodsIn a 3-year field experiment, four oilseed rape cultivars were cultivated at limiting, medium, and high N supply.ResultsN harvest indices in this study were comparatively high (around 0.79) and leaf N losses amounted to at most 13 kg N ha−1. 86 % of the leaf N present at the beginning of flowering was remobilised, irrespective of N rate or cultivar. Nevertheless, genotypic variation in leaf N loss existed. They were mainly due to differences in leaf N accumulation until flowering. Residual N in stems (up to 33 kg N ha−1) was higher than leaf N losses and varied more between treatments but was not related to genotypic variation in yield.ConclusionsN uptake after flowering was more important than N remobilisation from vegetative biomass for genotypic variation in seed yield both at low and high N supply.
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影响油菜最佳氮肥施用量的土壤和冠层因素分析
影响因子：
0.6
作者：
J. Henke;K. Sieling;W. Sauermann;H. Kage
通讯作者：
H. Kage
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
F. Wiesler;T. Behrens;W. Horst
通讯作者：
W. Horst
高或低辐照度下生长的伞形乌药叶光合作用、氮含量和氮分配的季节变化。
DOI：
--
发表时间：
2006
期刊：
Tree Physiology 26
影响因子：
--
作者：
木田 祐一郎;森本 富美子;阪口 雅郎;Yasumura Y
通讯作者：
Yasumura Y
影响因子：
7.3
作者：
Takashima, T;Hikosaka, K;Hirose, T
通讯作者：
Hirose, T