Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 22, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/ijms22179527
Keywords
maize; nitrate; nitric oxide; root; signaling; transcriptome
Funding
- University of Padova
- Fondazione Cassa di Risparmio di Padova e Rovigo (CARIPARO 2015)
- PRID 2019 [BIRD 198379]
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In this study, RNA sequencing was used to identify the main molecular signatures of maize root response to nitrate, distinguishing between nitric oxide-dependent and independent pathways. Six clusters of transcripts were identified based on their responsiveness to nitric oxide and regulation by nitrate provision, providing insight into the overall root response to nitrate.
Maize root responds to nitrate by modulating its development through the coordinated action of many interacting players. Nitric oxide is produced in primary root early after the nitrate provision, thus inducing root elongation. In this study, RNA sequencing was applied to discover the main molecular signatures distinguishing the response of maize root to nitrate according to their dependency on, or independency of, nitric oxide, thus discriminating the signaling pathways regulated by nitrate through nitric oxide from those regulated by nitrate itself of by further downstream factors. A set of subsequent detailed functional annotation tools (Gene Ontology enrichment, MapMan, KEGG reconstruction pathway, transcription factors detection) were used to gain further information and the lateral root density was measured both in the presence of nitrate and in the presence of nitrate plus cPTIO, a specific NO scavenger, and compared to that observed for N-depleted roots. Our results led us to identify six clusters of transcripts according to their responsiveness to nitric oxide and to their regulation by nitrate provision. In general, shared and specific features for the six clusters were identified, allowing us to determine the overall root response to nitrate according to its dependency on nitric oxide.
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