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Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding
During vegetative growth maize can accumulate luxury nitrogen (N) in excess of what is required for biomass accumulation. When post-silking N uptake is restricted, this luxury N may mitigate N stress by acting as an N reserve that buffers grain yield and maintains plant function. The objective of th...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Frontiers Media S.A.
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6443847/ https://www.ncbi.nlm.nih.gov/pubmed/30972083 http://dx.doi.org/10.3389/fpls.2019.00318 |
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author | Nasielski, Joshua Earl, Hugh Deen, Bill |
author_facet | Nasielski, Joshua Earl, Hugh Deen, Bill |
author_sort | Nasielski, Joshua |
collection | PubMed |
description | During vegetative growth maize can accumulate luxury nitrogen (N) in excess of what is required for biomass accumulation. When post-silking N uptake is restricted, this luxury N may mitigate N stress by acting as an N reserve that buffers grain yield and maintains plant function. The objective of this study was to determine if and how luxury accumulation of N prior to silking can buffer yield against post-silking N and/or water stress in maize. In a greenhouse experiment, maize was grown in high (N(veg)) and low (n(veg)) N conditions during vegetative growth. The n(veg) treatment did not affect biomass accumulation or leaf area by silking but did accumulate less total N compared to the N(veg) treatment. The N(veg) treatment generated a reserve of 1.1 g N plant(-1). Plants in both treatments were then subjected to water and/or N stress after silking. (15)N isotope tracers were delivered during either vegetative or reproductive growth to measure N remobilization and the partitioning of post-silking N uptake with and without a luxury N reserve. Under post-silking N and/or water stress, yield was consistently greater in N(veg) compared to n(veg) due to a reduction in kernel abortion. The N(veg) treatment resulted in greater kernel numbers and increased N remobilization to meet grain N demand under post-silking N stress. Luxury N uptake at silking also improved leaf area longevity in N(veg) plants compared to n(veg) under post-silking N stress, leading to greater biomass production. While post-silking N uptake was similar across N(veg) and n(veg), N(veg) plants partitioned a greater proportion of post-silking N to vegetative organs, which may have assisted with the maintenance of leaf function and root N uptake capacity. These results indicate that N uptake at silking in excess of vegetative growth requirements can minimize the effect of N and/or water stress during grain-fill. |
format | Online Article Text |
id | pubmed-6443847 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-64438472019-04-10 Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding Nasielski, Joshua Earl, Hugh Deen, Bill Front Plant Sci Plant Science During vegetative growth maize can accumulate luxury nitrogen (N) in excess of what is required for biomass accumulation. When post-silking N uptake is restricted, this luxury N may mitigate N stress by acting as an N reserve that buffers grain yield and maintains plant function. The objective of this study was to determine if and how luxury accumulation of N prior to silking can buffer yield against post-silking N and/or water stress in maize. In a greenhouse experiment, maize was grown in high (N(veg)) and low (n(veg)) N conditions during vegetative growth. The n(veg) treatment did not affect biomass accumulation or leaf area by silking but did accumulate less total N compared to the N(veg) treatment. The N(veg) treatment generated a reserve of 1.1 g N plant(-1). Plants in both treatments were then subjected to water and/or N stress after silking. (15)N isotope tracers were delivered during either vegetative or reproductive growth to measure N remobilization and the partitioning of post-silking N uptake with and without a luxury N reserve. Under post-silking N and/or water stress, yield was consistently greater in N(veg) compared to n(veg) due to a reduction in kernel abortion. The N(veg) treatment resulted in greater kernel numbers and increased N remobilization to meet grain N demand under post-silking N stress. Luxury N uptake at silking also improved leaf area longevity in N(veg) plants compared to n(veg) under post-silking N stress, leading to greater biomass production. While post-silking N uptake was similar across N(veg) and n(veg), N(veg) plants partitioned a greater proportion of post-silking N to vegetative organs, which may have assisted with the maintenance of leaf function and root N uptake capacity. These results indicate that N uptake at silking in excess of vegetative growth requirements can minimize the effect of N and/or water stress during grain-fill. Frontiers Media S.A. 2019-03-26 /pmc/articles/PMC6443847/ /pubmed/30972083 http://dx.doi.org/10.3389/fpls.2019.00318 Text en Copyright © 2019 Nasielski, Earl and Deen. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Plant Science Nasielski, Joshua Earl, Hugh Deen, Bill Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding |
title | Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding |
title_full | Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding |
title_fullStr | Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding |
title_full_unstemmed | Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding |
title_short | Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding |
title_sort | luxury vegetative nitrogen uptake in maize buffers grain yield under post-silking water and nitrogen stress: a mechanistic understanding |
topic | Plant Science |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6443847/ https://www.ncbi.nlm.nih.gov/pubmed/30972083 http://dx.doi.org/10.3389/fpls.2019.00318 |
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