Nitrogen efficiency of contrasting rape ideotypes
Nitrogen efficiency of contrasting rape ideotypes
复制标题
对比油菜表型的氮效率
DOI：
--
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
W. Horst
中科院分区：
文献类型：
--
作者：
F. Wiesler;T. Behrens;W. Horst
通过3年田间试验，发现不同商品型油菜（Brassica napus L.）在低、高供氮条件下的生长、种子产量、氮素吸收、氮素利用和叶片光合活性均存在显著差异。低氮条件下的种子产量与(i)生殖生长期的氮吸收和（ii）花末叶片的光合活性相关。种子产量与(i)开花前氮素吸收量和（ii）成熟期秸秆氮素积累量之间不存在显著关系。基于这些结果，我们得出结论，通过“改良的传统形态”（即更好地重新利用开花前吸收的氮）提高油菜氮素效率的前景不如“替代形态”（即维持生殖生长期的氮素吸收）。
In a 3-years field experiment significant differences among commercial winter rape cultivars (Brassica napus L.) were found regarding growth, seed yield, nitrogen (N) uptake, N utilisation and photosynthetic activity of leaves at low and high N supply. Seed yield under conditions of low N supply was correlated with (i) N uptake during the reproductive growth phase and (ii) photosynthetic activity of leaves at the end of flowering. No significant relationships existed between seed yield and (i) N uptake until flowering and (ii) the amount of N accumulated in the straw at maturity. Based on these results we conclude that there are less perspectives to improve N efficiency of oilseed rape by an “improved traditional ideotype” (i.e. better remobilization of N taken up before flowering) than by an “alternative ideotype” (i.e. maintenance of N uptake during the reproductive growth phase).