Please use this identifier to cite or link to this item: http://223.31.159.10:8080/jspui/handle/123456789/1607
Title: Identifying the mechanistic basis to nitrogen responsiveness in two contrasting Setaria italica accessions
Authors: Bandyopadhyay, Tirthankar
Maurya, Jyoti
Bentley, Alison R
Griffiths, Howard
Swarbreck, Stéphanie M
Prasad, Manoj
Keywords: Setaria italica
Biomass partitioning
climate change
gene expression
grain filling
nitrogen remobilization
nitrogen responsiveness
panicle
sustainable agriculture
Issue Date: 2024
Publisher: Oxford University Press
Citation: Journal of Experimental Botany, 75(16): 5008-5020
Abstract: Nitrogen (N) is a macronutrient limiting crop productivity with varied requirements across species and genotypes. Understanding the mechanistic basis of N responsiveness by comparing contrasting genotypes could inform the development and selection of varieties with lower N demands, or inform agronomic practices to sustain yields with lower N inputs. Given the established role of millets in ensuring climate-resilient food and nutrition security, we investigated the physiological and genetic basis of nitrogen responsiveness in foxtail millet (Setaria italica L.). We had previously identified genotypic variants linked to N responsiveness, and here, we dissect the mechanistic basis of the trait by examining the physiological and molecular behaviour of N responsive (NRp-SI58) and non-responsive (NNRp-SI114) accessions at high and low N. Under high N, NRp-SI58 allocates significantly more biomass to nodes, internodes and roots, more N to developing grains, and is more effective at remobilising flag leaf N compared to NNRp-SI114. Post anthesis flag leaf gene expression suggests that differences in N induce much higher transcript abundance in NNRp-SI114 than NRp-SI58, a large proportion of which are potentially regulated by APETALA2 (AP2) transcription factors. Overall, the study provides novel insights into the regulation and manipulation of N responsiveness in S. italica.
Description: Accepted date:7 May 2024
URI: https://academic.oup.com/jxb/advance-article-abstract/doi/10.1093/jxb/erae204/7670764?redirectedFrom=fulltext&login=true
http://223.31.159.10:8080/jspui/handle/123456789/1607
ISSN: 1460-2431
0022-0957
Appears in Collections:Institutional Publications

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