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Updated: Jan 23, 2026

Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis
Published on: May 10, 2020
Low Nitrogen Enhances Nitrogen Use Efficiency by Triggering NO3- Uptake and Its Long-Distance Translocation
Zhimin Wu1, Jinsong Luo1, Yongliang Han1
1Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, College of Resources and Environmental Sciences , Hunan Agricultural University , Changsha , Hunan 410128 , People's Republic of China.
Abstract:
Nitrogen is essential for plant growth and crop productivity; however, nitrogen use efficiency (NUE) decreases with increasing N supply, resulting in a waste of resources. Molecular mechanisms underlying low-nitrogen (LN)-mediated enhancement of NUE are not clear. We used high-NUE Brassica napus genotype H (Xiangyou 15), low-NUE B. napus genotype L (814), and Arabidopsis mutant aux1 to elucidate the mechanism underlying the changes in NUE under different rates of N fertilizer application. NUE of B. napus increased under LN, which enhanced N uptake ability by regulating root system architecture and plasma membrane H+-ATPase activity; AUX1 was involved in this process. Additionally, BnNRT1.5 was upregulated and BnNRT1.8 was downregulated under LN, whereby more N was transferred to the shoot through enhanced N transport. Observed changes in photosynthesis under LN were associated with N assimilation efficiency. Our study provides new insights into the mechanisms of plant adaptation to the environment.
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