Nadeem, F. and Ahmad, Z. and Wang, R. and Han, J. and etl, .
(2018)
Foxtail Millet
[Setaria italica (L.) Beauv.] Grown
under low nitrogen shows a smaller
root system, enhanced biomass
accumulation, and nitrate transporter
expression.
Frontiers in Plant Science, 9.
pp. 1-12.
![[img]](http://eprints.icrisat.ac.in/15740/1.hassmallThumbnailVersion/FrontierPlantSciece_9_1-12_2018.pdf)  Preview |
|
PDF (This is an Open Access Article)
- Published Version
| Preview
|
Abstract
Foxtail millet (FM) [Setaria italica (L.) Beauv.] is a grain and forage crop well adapted
to nutrient-poor soils. To date little is known how FM adapts to low nitrogen (LN) at
the morphological, physiological, and molecular levels. Using the FM variety Yugu1,
we found that LN led to lower chlorophyll contents and N concentrations, and higher
root/shoot and C/N ratios and N utilization efficiencies under hydroponic culture.
Importantly, enhanced biomass accumulation in the root under LN was in contrast to
a smaller root system, as indicated by significant decreases in total root length; crown
root number and length; and lateral root number, length, and density. Enhanced carbon
allocation toward the root was rather for significant increases in average diameter of
the LN root, potentially favorable for wider xylem vessels or other anatomical alterations
facilitating nutrient transport. Lower levels of IAA and CKs were consistent with a smaller
root system and higher levels of GA may promote root thickening under LN. Further,
up-regulation of SiNRT1.1, SiNRT2.1, and SiNAR2.1 expression and nitrate influx in the
root and that of SiNRT1.11 and SiNRT1.12 expression in the shoot probably favored
nitrate uptake and remobilization as a whole. Lastly, more soluble proteins accumulated
in the N-deficient root likely as a result of increases of N utilization efficiencies.
Such “excessive” protein-N was possibly available for shoot delivery. Thus, FM may
preferentially transport carbon toward the root facilitating root thickening/nutrient
transport and allocate N toward the shoot maximizing photosynthesis/carbon fixation
as a primary adaptive strategy to N limitation.
| Item Type: |
Article
|
| Uncontrolled Keywords: |
Foxtail millet (FM), low nitrogen (LN), root architecture, nitrogen uptake, nitrogen transport |
| Author Affiliation: |
Key Laboratory of Plant–Soil Interactions, Ministry of Education, Department of Plant Nutrition, China Agricultural University,
Beijing, China, |
| Subjects: |
Plant Production |
| Divisions: |
Millet |
| Depositing User: |
Mr T L Gautham
|
| Date Deposited: |
03 Jan 2019 05:37 |
| Last Modified: |
03 Jan 2019 05:37 |
| URI: |
http://eprints.icrisat.ac.in/id/eprint/15740 |
Actions (login required)
 |
View Item |
