Ahmad Altaf, Khan Ishrat, Abrol Yash P, Iqbal Muhammad
Department of Botany, Faculty of Science, Hamdard University, Hamdard Nagar, New Delhi 110062, India.
Environ Pollut. 2008 Aug;154(3):462-6. doi: 10.1016/j.envpol.2007.10.007. Epub 2007 Nov 26.
This experiment was conducted to investigate the variation of nitrogen efficiency (NE), nitrogen uptake efficiency (UE), physiological nitrogen use efficiency (PUE) among Indian mustard genotypes, grown under N-insufficient and N-sufficient conditions. Nitrogen efficiency varied from 52.7 to 92.8. Seed yield varied from 1.14 t ha(-1) to 3.21 t ha(-1) under N-insufficient condition, while 2.14 t ha(-1)-3.33 t ha(-1) under N-sufficient condition. Physiological basis of this difference was explained in terms of nitrogen uptake efficiency and physiological nitrogen use efficiency, and their relationship with the growth and yield characteristics. While nitrogen uptake efficiency was positively correlated with plant biomass (0.793**), leaf area index (0.664*), and leaf nitrogen content (0.783**), physiological nitrogen use efficiency is positively correlated with photosynthetic rate (0.689**) and yield (0.814**). This study suggests that genotype having high nitrogen uptake efficiency and high physiological nitrogen use efficiency might help in reducing the nitrogen load on soil without any penalty on the yield.
本实验旨在研究印度芥菜基因型在氮素不足和氮素充足条件下生长时，氮效率（NE）、氮吸收效率（UE）、生理氮利用效率（PUE）的变化情况。氮效率在52.7至92.8之间变化。在氮素不足条件下，种子产量在1.14 t·ha⁻¹至3.21 t·ha⁻¹之间，而在氮素充足条件下为2.14 t·ha⁻¹至3.33 t·ha⁻¹。从氮吸收效率和生理氮利用效率及其与生长和产量特征的关系方面解释了这种差异的生理基础。氮吸收效率与植物生物量（0.793**）、叶面积指数（0.664*）和叶片氮含量（0.783**）呈正相关，而生理氮利用效率与光合速率（0.689**）和产量（0.814**）呈正相关。本研究表明，具有高氮吸收效率和高生理氮利用效率的基因型可能有助于减少土壤中的氮负荷，且不会对产量造成任何损失。
