Effect of Senescence Phenotypes and Nitrate Availability on Wheat Leaf Metabolome during Grain Filling

A - Papers appearing in refereed journals

Heyneke, E., Watanabe, M., Erban, A., Duan, G., Buchner, P. H., Walther, D., Kopka, J., Hawkesford, M. J. and Hoefgen, R. 2019. Effect of Senescence Phenotypes and Nitrate Availability on Wheat Leaf Metabolome during Grain Filling . Agronomy. 9 (6), p. 305.

AuthorsHeyneke, E., Watanabe, M., Erban, A., Duan, G., Buchner, P. H., Walther, D., Kopka, J., Hawkesford, M. J. and Hoefgen, R.
Abstract

The capacity for optimising grain yield depends largely on the timing of senescence and the processes underlying efficient remobilisation and cycling of nutrients from source tissues to the developing grain. This study describes how metabolism is adjusted during senescence in response to varying nitrogen application rates after anthesis. A comprehensive metabolite analysis was performed in field-grown Avalon/Cadenza using segregating doubled haploid wheat genotypes having contrasting traits relating to timing of the onset of senescence. Correlative matrices of metabolites and yield parameters determined the metabolic networks that underlie these phenotypes, and were helpful for identifying unique metabolites that are indicative of timing of senescence. They also revealed robust correlations between steady increases in hexose levels, a late senescence phenotype and high straw yield associated with low N fertiliser levels. Tryptophan, cis-aconitate, phosphate and 1-kestose demonstrated strong perturbations in response to nitrogen availability and progression towards developmental senescence. A comprehensive metabolic map of wheat leaf primary metabolites yielded a cumulative readout of processes that occur during developmental ripening and contribute to grain filling in plants with differential senescence timing.

KeywordsNitrogen/nutrient; Chlorophyll contents; Early and late senescence phenotype; Metabolite; Wheat leaf
Year of Publication2019
JournalAgronomy
Journal citation9 (6), p. 305
Digital Object Identifier (DOI)doi:10.3390/agronomy9060305
Open accessPublished as green open access
Funder project or code[20:20 Wheat] Maximising yield potential of wheat
Designing Future Wheat - WP1 - Increased efficiency and sustainability
WGIN
FunderBiotechnology and Biological Sciences Research Council
Department of Environment, Food and Rural Affairs
Publisher's versionHeyneke et al 2019 agronomy.pdf
Output statusPublished
Publication dates
Online11 Jun 2019
Publication process dates
Accepted30 Jun 2019
PublisherMDPI
ISSN2073-4395

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