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Post-Silking Shading Stress Affects Leaf Nitrogen Metabolism of Spring Maize in Southern China

Lower sunlight caused by overcast skies from June to July in Southern China is one of the main environmental stresses that frequently occur and affect the post-silking growth and grain development of spring maize. In this study, a field trial involving four maize hybrids as materials was conducted t...

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Autores principales: Wang, Jue, Shi, Kai, Lu, Weiping, Lu, Dalei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7076639/
https://www.ncbi.nlm.nih.gov/pubmed/32041314
http://dx.doi.org/10.3390/plants9020210
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author Wang, Jue
Shi, Kai
Lu, Weiping
Lu, Dalei
author_facet Wang, Jue
Shi, Kai
Lu, Weiping
Lu, Dalei
author_sort Wang, Jue
collection PubMed
description Lower sunlight caused by overcast skies from June to July in Southern China is one of the main environmental stresses that frequently occur and affect the post-silking growth and grain development of spring maize. In this study, a field trial involving four maize hybrids as materials was conducted to investigate the effects of post-silking shading stress (30% and 50% light deprivation) on leaf nitrogen metabolism and biomass accumulation during maize growing seasons in 2016 and 2017. Results indicated that 30% and 50% shading stress caused the grain yield to decrease by 47.3% and 69.6%, respectively. Plant post-silking biomass accumulation was decreased by shading, whereas the translocation from pre-silking assimilates in the vegetative organs was increased by shading. This change was sharply observed when the plants were deprived of more sunlight intensity. The leaf relative chlorophyll (soil and plant analyzer development (SPAD) value) and soluble protein contents were considerably decreased by shading under 50% light deprivation condition. The activities of nitrate reductase, glutamine synthetase and glutamate synthase that are involved in nitrogen metabolism were downregulated by shading stresses. In conclusion, nitrogen metabolism was disturbed by shading, which induced the decrease in post-silking dry matter accumulation, ultimately resulting in grain yield loss.
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spelling pubmed-70766392020-03-20 Post-Silking Shading Stress Affects Leaf Nitrogen Metabolism of Spring Maize in Southern China Wang, Jue Shi, Kai Lu, Weiping Lu, Dalei Plants (Basel) Article Lower sunlight caused by overcast skies from June to July in Southern China is one of the main environmental stresses that frequently occur and affect the post-silking growth and grain development of spring maize. In this study, a field trial involving four maize hybrids as materials was conducted to investigate the effects of post-silking shading stress (30% and 50% light deprivation) on leaf nitrogen metabolism and biomass accumulation during maize growing seasons in 2016 and 2017. Results indicated that 30% and 50% shading stress caused the grain yield to decrease by 47.3% and 69.6%, respectively. Plant post-silking biomass accumulation was decreased by shading, whereas the translocation from pre-silking assimilates in the vegetative organs was increased by shading. This change was sharply observed when the plants were deprived of more sunlight intensity. The leaf relative chlorophyll (soil and plant analyzer development (SPAD) value) and soluble protein contents were considerably decreased by shading under 50% light deprivation condition. The activities of nitrate reductase, glutamine synthetase and glutamate synthase that are involved in nitrogen metabolism were downregulated by shading stresses. In conclusion, nitrogen metabolism was disturbed by shading, which induced the decrease in post-silking dry matter accumulation, ultimately resulting in grain yield loss. MDPI 2020-02-06 /pmc/articles/PMC7076639/ /pubmed/32041314 http://dx.doi.org/10.3390/plants9020210 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Jue
Shi, Kai
Lu, Weiping
Lu, Dalei
Post-Silking Shading Stress Affects Leaf Nitrogen Metabolism of Spring Maize in Southern China
title Post-Silking Shading Stress Affects Leaf Nitrogen Metabolism of Spring Maize in Southern China
title_full Post-Silking Shading Stress Affects Leaf Nitrogen Metabolism of Spring Maize in Southern China
title_fullStr Post-Silking Shading Stress Affects Leaf Nitrogen Metabolism of Spring Maize in Southern China
title_full_unstemmed Post-Silking Shading Stress Affects Leaf Nitrogen Metabolism of Spring Maize in Southern China
title_short Post-Silking Shading Stress Affects Leaf Nitrogen Metabolism of Spring Maize in Southern China
title_sort post-silking shading stress affects leaf nitrogen metabolism of spring maize in southern china
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7076639/
https://www.ncbi.nlm.nih.gov/pubmed/32041314
http://dx.doi.org/10.3390/plants9020210
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