scholarly journals Varietal differences in root growth as related to nitrogen uptake by sorghum plants in low-nitrogen environment

2002 ◽  
pp. 103-110 ◽  
Author(s):  
Takuji Nakamura ◽  
Joseph J. Adu-Gyamfi ◽  
Akiko Yamamoto ◽  
Satoru Ishikawa ◽  
Hiroshi Nakano ◽  
...  
Keyword(s):  
Root Growth ◽  
Nitrogen Uptake ◽  
Varietal Differences ◽  
Low Nitrogen

Nitrogen Uptake and Allocation in Sweet Viburnum During a Root Growth Flush

2007 ◽  
Vol 30 (3) ◽  
pp. 487-496 ◽  
Author(s):  
Gisele Schoene ◽  
Thomas Yeager
Keyword(s):  
Root Growth ◽  
Nitrogen Uptake ◽  
Sweet Viburnum

scholarly journals In-Field Observation of Root Growth and Nitrogen Uptake Efficiency of Winter Oilseed Rape

Agronomy ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 105
Author(s):  
Julien Louvieaux ◽  
Antoine Leclercq ◽  
Loïc Haelterman ◽  
Christian Hermans
Keyword(s):  
Root Growth ◽  
Oilseed Rape ◽  
Root Development ◽  
Nitrogen Uptake ◽  
Root Morphology ◽  
Growth Stages ◽  
Winter Oilseed Rape ◽  
Nitrogen Uptake Efficiency ◽  
Uptake Efficiency ◽  
N Concentration

Field trials were conducted with two nitrogen applications (0 or 240 kg N ha−1) and three modern cultivars of winter oilseed rape (Brassica napus L.) previously selected from a root morphology screen at a young developmental stage. The purpose is to examine the relationship between root morphology and Nitrogen Uptake Efficiency (NUpE) and to test the predictiveness of some canopy optical indices for seed quality and yield. A tube-rhizotron system was used to incorporate below-ground root growth information. Practically, clear tubes of one meter in length were installed in soil at an angle of 45°. The root development was followed with a camera at key growth stages in autumn (leaf development) and spring (stem elongation and flowering). Autumn was a critical time window to observe the root development, and exploration in deeper horizons (36–48 cm) was faster without any fertilization treatment. Analysis of the rhizotron images was challenging and it was not possible to clearly discriminate between cultivars. Canopy reflectance and leaf optical indices were measured with proximal sensors. The Normalized Difference Vegetation Index (NDVI) was a positive indicator of biomass and seed yield while the Nitrogen Balance Index (NBI) was a positive indicator of above-ground biomass N concentration at flowering and seed N concentration at harvest.

scholarly journals An Integrated Analysis of the Rice Transcriptome and Metabolome Reveals Root Growth Regulation Mechanisms in Response to Nitrogen Availability

2019 ◽  
Vol 20 (23) ◽  
pp. 5893 ◽  
Author(s):  
Wei Xin ◽  
Lina Zhang ◽  
Wenzhong Zhang ◽  
Jiping Gao ◽  
Jun Yi ◽  
...  
Keyword(s):  
Root Growth ◽  
Differentially Expressed Genes ◽  
Nitrogen Availability ◽  
Rice Root ◽  
Integrated Analysis ◽  
High Nitrogen ◽  
Rice Roots ◽  
Regulation Mechanisms ◽  
Low Nitrogen ◽  
Nitrogen Conditions

Nitrogen is an essential nutrient for plant growth and basic metabolic processes. Root systems play an important role in the ability of plants to obtain nutrients from the soil, and are closely related to the growth and development of above-ground plants. Root morphology analysis showed that root growth was induced under low-nitrogen conditions and inhibited under high-nitrogen conditions. To better understand the molecular mechanisms and metabolic basis underlying the rice root response to nitrogen availability, an integrated analysis of the rice root transcriptome and metabolome under three environmental conditions (low-, control, and high-nitrogen conditions) was conducted. A total of 262 and 262 differentially level metabolites were identified under low- and high-nitrogen conditions, respectively. A total of 696 and 808 differentially expressed genes were identified under low- and high-nitrogen conditions, respectively. For both the differentially expressed genes and metabolites, KEGG pathway analysis indicated that amino acid metabolism, carbon and nitrogen metabolism, phenylpropanoid metabolism, and phytohormones’ signal transduction were significantly affected by nitrogen availability. Additionally, variable levels of 65 transcription factors (TFs) were identified in rice leaves exposed to high and low nitrogen, covering 22 TF families. These results also indicate that there is a significant difference in the transcriptional regulation mechanisms of rice roots between low and high nitrogen. In summary, our study provides new information for a further understanding of the response of rice roots to low-nitrogen and high-nitrogen conditions.

Localized root growth in soil induced by controlled‐release urea granule and barley nitrogen uptake

2000 ◽  
Vol 23 (3) ◽  
pp. 413-422 ◽  
Author(s):  
M. Zhang ◽  
M. Nyborg ◽  
S. S. Malhi ◽  
E. D. Solberg
Keyword(s):  
Controlled Release ◽  
Root Growth ◽  
Nitrogen Uptake ◽  
Controlled Release Urea

scholarly journals Relationship of Nitrogen Use Efficiency with the Activities of Enzymes Involved in Nitrogen Uptake and Assimilation of Finger Millet Genotypes Grown under Different Nitrogen Inputs

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Nidhi Gupta ◽  
Atul K. Gupta ◽  
Vikram S. Gaur ◽  
Anil Kumar
Keyword(s):  
Nitrogen Uptake ◽  
Nitrogen Use Efficiency ◽  
Finger Millet ◽  
High Nitrogen ◽  
Nitrogen Use ◽  
Nitrogen Uptake Efficiency ◽  
Yield Parameters ◽  
Use Efficiency ◽  
Low Nitrogen ◽  
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.

scholarly journals Identification and characterization of circRNAs involved in the regulation of low nitrogen-promoted root growth in hexaploid wheat

2018 ◽  
Vol 51 (1) ◽  
Author(s):  
Yongzhe Ren ◽  
Huifang Yue ◽  
Le Li ◽  
Yanhua Xu ◽  
Zhiqiang Wang ◽  
...  
Keyword(s):  
Root Growth ◽  
Hexaploid Wheat ◽  
Identification And Characterization ◽  
Low Nitrogen

Root growth and nitrogen uptake in sycamore (Acer pseudoplantanus L.) seedlings in relation to nitrogen supply

1994 ◽  
Vol 158 (2) ◽  
pp. 233-238 ◽  
Author(s):  
L. A. Mackie-Dawson ◽  
S. M. Pratt ◽  
P. Millard
Keyword(s):  
Root Growth ◽  
Nitrogen Uptake ◽  
Nitrogen Supply

scholarly journals Intercropping effect on root growth and nitrogen uptake at different nitrogen levels

2014 ◽  
Vol 8 (4) ◽  
pp. 380-389 ◽  
Author(s):  
Javier Ramirez-Garcia ◽  
Helle J. Martens ◽  
Miguel Quemada ◽  
Kristian Thorup-Kristensen
Keyword(s):  
Root Growth ◽  
Nitrogen Uptake ◽  
Nitrogen Levels
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