Responses of two rice cultivars differing in seedling-stage nitrogen use efficiency to growth under low-nitrogen conditions

Nitrogen responsiveness of three-finger millet genotypes (differing in their seed coat colour) PRM-1 (brown), PRM-701 (golden), and PRM-801 (white) grown under different nitrogen doses was determined by analyzing the growth, yield parameters and activities of nitrate reductase (NR), glutamine synthetase (GS), glutamate synthase; GOGAT, and glutamate dehydrogenase (GDH) at different developmental stages. High nitrogen use efficiency and nitrogen utilization efficiency were observed in PRM-1 genotype, whereas high nitrogen uptake efficiency was observed in PRM-801 genotype. At grain filling nitrogen uptake efficiency in PRM-1 negatively correlated with NR, GS, GOGAT activities whereas it was positively correlated in PRM-701 and PRM-801, however, GDH showed a negative correlation. Growth and yield parameters indicated that PRM-1 responds well at high nitrogen conditions while PRM-701 and PRM-801 respond well at normal and low nitrogen conditions respectively. The study indicates that PRM-1 is high nitrogen responsive and has high nitrogen use efficiency, whereas golden PRM-701 and white PRM-801 are low nitrogen responsive genotypes and have low nitrogen use efficiency. However, the crude grain protein content was higher in PRM-801 genotype followed by PRM-701 and PRM-1, indicating negative correlation of nitrogen use efficiency with source to sink relationship in terms of seed protein content.

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Improved nitrogen use efficiency in transgenic sugarcane: phenotypic assessment in a pot trial under low nitrogen conditions

Plant Cell Reports ◽

10.1007/s00299-015-1768-y ◽

2015 ◽

Vol 34 (5) ◽

pp. 667-669 ◽

Cited By ~ 14

Author(s):

S. J. Snyman ◽

E. Hajari ◽

M. P. Watt ◽

Y. Lu ◽

J. C. Kridl

Keyword(s):

Nitrogen Use Efficiency ◽

Nitrogen Use ◽

Transgenic Sugarcane ◽

Use Efficiency ◽

Pot Trial ◽

Low Nitrogen ◽

Nitrogen Conditions

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Faculty Opinions recommendation of Improved nitrogen use efficiency in transgenic sugarcane: phenotypic assessment in a pot trial under low nitrogen conditions.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.725728679.793509095 ◽

2015 ◽

Author(s):

Luis Herrera-Estrella

Keyword(s):

Nitrogen Use Efficiency ◽

Nitrogen Use ◽

Transgenic Sugarcane ◽

Use Efficiency ◽

Pot Trial ◽

Low Nitrogen ◽

Nitrogen Conditions

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Differences of Plant-Type Characteristics between Rice Cultivars with High and Low Levels in Yield and Nitrogen Use Efficiency

ACTA AGRONOMICA SINICA ◽

10.3724/sp.j.1006.2010.01011 ◽

2010 ◽

Vol 36 (6) ◽

pp. 1011-1021

Author(s):

Qing ZHANG ◽

Chun-Yuan YIN ◽

Hong-Cheng ZHANG ◽

Hai-Yan WEI ◽

Qun MA ◽

...

Keyword(s):

Nitrogen Use Efficiency ◽

Rice Cultivars ◽

Plant Type ◽

Nitrogen Use ◽

Use Efficiency ◽

Low Levels

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Morphological and physiological plasticity response to low nitrogen stress in black cottonwood (Populus deltoides Marsh.)

Journal of Forestry Research ◽

10.1007/s11676-021-01338-4 ◽

2021 ◽

Author(s):

Cun Chen ◽

Yanguang Chu ◽

Qinjun Huang ◽

Changjun Ding ◽

Weixi Zhang ◽

...

Keyword(s):

Negative Correlation ◽

Nitrogen Use Efficiency ◽

Root Biomass ◽

Populus Deltoides ◽

Leaf Traits ◽

Nitrogen Level ◽

Nitrogen Use ◽

Use Efficiency ◽

Normal Nitrogen ◽

Low Nitrogen

AbstractIt is important to evaluate nitrogen use efficiency and nitrogen tolerance of trees in order to improve their productivity. In this study, both were evaluated for 338 Populus deltoides genotypes from six provenances. The plants were cultured under normal nitrogen (750 μM NH4NO3) and low nitrogen (5 μM NH4NO3) conditions for 3 months. Growth, chlorophyll content and glutamine synthetase activity of each genotype were measured. Under low nitrogen, heights, ground diameter, leaf area, leaf and root biomass, and chlorophyll contents were significantly lower than those under normal nitrogen level. Correlation analysis showed that nutrient distribution changed under different nitrogen treatments. There was a negative correlation between leaf traits and root biomass under normal nitrogen level, however, the correlation became positive in low nitrogen treatment. Moreover, with the decrease of nitrogen level, the negative correlation between leaf morphology and chlorophyll levels became weakened. The growth of the genotypes under the two treatments was evaluated by combining principal component analysis with a fuzzy mathematical membership function; the results showed that leaf traits accounted for a large proportion of the variation in the evaluation model. According to the results of comprehensive evaluation of plants under the two treatments, the 338 P. deltoides genotypes could be divided into nine categories, with wide genotypic diversity in nitrogen use efficiency and low nitrogen tolerance. As a result, 26 N-efficient genotypes and 24 N-inefficient genotypes were selected. By comparative analysis of their morphological and physiological traits under the two treatments, leaf traits could be significant indicators for nitrogen use efficiency and nitrogen tolerance, which is of considerable significance for breeding poplar varieties with high nitrogen use efficiencies.

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Enhanced sustainable green revolution yield via nitrogen-responsive chromatin modulation in rice

Science ◽

10.1126/science.aaz2046 ◽

2020 ◽

Vol 367 (6478) ◽

pp. eaaz2046 ◽

Cited By ~ 26

Author(s):

Kun Wu ◽

Shuansuo Wang ◽

Wenzhen Song ◽

Jianqing Zhang ◽

Yun Wang ◽

...

Keyword(s):

Nitrogen Use Efficiency ◽

Green Revolution ◽

Agricultural Sustainability ◽

Nitrogen Use ◽

Polycomb Repressive Complex 2 ◽

Della Proteins ◽

Genome Wide ◽

Use Efficiency ◽

Low Nitrogen ◽

Cereal Yields

Because environmentally degrading inorganic fertilizer use underlies current worldwide cereal yields, future agricultural sustainability demands enhanced nitrogen use efficiency. We found that genome-wide promotion of histone H3 lysine 27 trimethylation (H3K27me3) enables nitrogen-induced stimulation of rice tillering: APETALA2-domain transcription factor NGR5 (NITROGEN-MEDIATED TILLER GROWTH RESPONSE 5) facilitates nitrogen-dependent recruitment of polycomb repressive complex 2 to repress branching-inhibitory genes via H3K27me3 modification. NGR5 is a target of gibberellin receptor GIBBERELLIN INSENSITIVE DWARF1 (GID1)–promoted proteasomal destruction. DELLA proteins (characterized by the presence of a conserved aspartate-glutamate-leucine-leucine-alanine motif) competitively inhibit the GID1-NGR5 interaction and explain increased tillering of green revolution varieties. Increased NGR5 activity consequently uncouples tillering from nitrogen regulation, boosting rice yield at low nitrogen fertilization levels. NGR5 thus enables enhanced nitrogen use efficiency for improved future agricultural sustainability and food security.

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