Strategies for engineering improved nitrogen use efficiency in crop plants via redistribution and recycling of organic nitrogen

Vanessa J. Melino, Mark A. Tester, Mamoru Okamoto

Research output: Contribution to journalArticlepeer-review

Abstract

Global use of nitrogen (N) fertilizers has increased sevenfold from 1960 to 1995 but much of the N applied is lost to the environment. Modifying the temporal and spatial distribution of organic N within the plant can lead to improved grain yield and/or grain protein content for the same or reduced N fertilizer inputs. Biotechnological approaches to modify whole plant distribution of amino acids and ureides has proven successful in several crop species. Manipulating selective autophagy pathways in crops has also improved N remobilization efficiency to sink tissues whilst the contribution of ribophagy, RNA and purine catabolism to N recycling in crops is still too early to foretell. Improved recycling and remobilization of N must exploit N-stress responsive transcriptional regulators, N-sensing or phloem-localized promotors and genetic variation for N-responsive traits.
Original languageEnglish (US)
Pages (from-to)263-269
Number of pages7
JournalCurrent Opinion in Biotechnology
Volume73
DOIs
StatePublished - Sep 22 2021

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering
  • Biotechnology

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