Defoliation affects seed yield but not N uptake and growth rate in two oilseed rape cultivars differing in post-flowering N uptake
Defoliation affects seed yield but not N uptake and growth rate in two oilseed rape cultivars differing in post-flowering N uptake
复制标题
落叶影响种子产量，但不影响花后氮吸收不同的两个油菜品种的氮吸收和生长率
DOI：
10.1016/j.fcr.2015.04.005
复制
发表时间：
2015
影响因子：
5.8
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;Horst W.J;Schulte auf’m Erley G.
冬油菜氮效率的遗传变异与花后氮素吸收的变异密切相关。本研究验证了叶片同化物供应对油菜生殖生长过程中氮素高吸收起决定性作用的假说。通过为期三年的田间试验，对两个氮效率不同的冬季油菜品种进行了从缺氮到最佳氮素供应的三种施氮量的试验。在小区中，50%的叶片在开花开始时被摘除。对两个品种的种子产量、总生物量、氮素吸收和产量构成因素进行了分析。这与生长速率下降或花后氮素吸收无关，而主要与叶片摘除导致的全氮减少有关。此外，油菜的收获指数和单位面积籽粒数也因去叶处理而降低。在生殖生长过程中，叶片同化物质的供应增强了N的吸收，这一假设不能被本实验所证实。相反，叶片对产量的重要性可能是由于生殖生长期间叶片对同化物的再动员。
Genotypic variation in nitrogen efficiency of winter oilseed rape is closely related to variation in post-flowering N uptake. In this study the hypothesis was tested that assimilate supply from the leaves is decisive for a high N uptake during reproductive growth.Two winter oilseed rape cultivars differing in N efficiency were cultivated in a three-year field experiment at three N rates, ranging from deficiency to optimal N supply. In sub-plots, 50% of the leaves were removed at the beginning of flowering. Seed yield, total biomass, N uptake and yield components were assessed.Defoliation caused substantial yield decrease at all N rates and for both cultivars. This was not related to decreased growth rates or post-flowering N uptake, but mainly to the reduction in total N by leaf removal. In addition, harvest index and seed number per area were reduced by the defoliation treatment.The results demonstrate that leaves are important for yield formation in oilseed rape. The hypothesis, that assimilate supply from the leaves enhances N uptake during reproductive growth could not be confirmed by this experiment. Instead, the importance of the leaves for yield may be due to assimilate remobilization from the leaves during reproductive growth.
植物育种的生化基础：第一卷碳代谢
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
C. Neyra
通讯作者：
C. Neyra
根生长特征导致油菜氮效率基因型变异
影响因子：
2.5
作者：
Ulas A;Schulte auf´m Erley G;Kahm M;Wiesler F;Horst W.J.
通讯作者：
Horst W.J.
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？
影响因子：
4.9
作者：
Ulas A;Behrens T;Wiesler F;Schulte auf’m Erley G.
通讯作者：
Schulte auf’m Erley G.