Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms

Abstract Cereal crop yield comprises interrelated components, among which the number of tillers is highly responsive to nitrogen fertilization. We addressed the hypothesis of whether the supply of different nitrogen forms can be employed to manipulate the tiller number in cereal crops. Relative to u...

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Autores principales:	Bernhard Bauer, Nicolaus von Wirén
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ddfacd6e8e7242f1807ca6e5dd1cd8fc
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spelling	oai:doaj.org-article:ddfacd6e8e7242f1807ca6e5dd1cd8fc2021-12-02T12:33:45ZModulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms10.1038/s41598-020-77467-32045-2322https://doaj.org/article/ddfacd6e8e7242f1807ca6e5dd1cd8fc2020-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-77467-3https://doaj.org/toc/2045-2322Abstract Cereal crop yield comprises interrelated components, among which the number of tillers is highly responsive to nitrogen fertilization. We addressed the hypothesis of whether the supply of different nitrogen forms can be employed to manipulate the tiller number in cereal crops. Relative to urea or ammonium, exclusive supply of nitrate increased tiller number in hydroponically-grown barley plants. Thereby, tiller number correlated positively with the root-to-shoot translocation rate of endogenous cytokinins. External supply of a synthetic cytokinin analog further stimulated tillering in nitrate-containing but not in urea-containing nutrient solution. When the cytokinin analog 6-benzylaminopurine riboside was externally supplied to roots, its translocation to shoots was 2.5 times higher in presence of nitrate than in presence of urea or ammonium, suggesting that cytokinin loading into the xylem is affected by different nitrogen forms. We then translated this finding to field scale, cultivated winter wheat in four environments, and confirmed that nitrate fertilization significantly increased tiller number in a dose-dependent manner. As assessed in 22 winter wheat cultivars, nitrogen form-dependent tiller formation was subject to substantial genotypic variation. We conclude that cytokinin-mediated signaling effects of fertilizer nitrogen forms can be employed as a management tool to regulate the tiller number in cereal crops.Bernhard BauerNicolaus von WirénNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-11 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bernhard Bauer Nicolaus von Wirén Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms
description	Abstract Cereal crop yield comprises interrelated components, among which the number of tillers is highly responsive to nitrogen fertilization. We addressed the hypothesis of whether the supply of different nitrogen forms can be employed to manipulate the tiller number in cereal crops. Relative to urea or ammonium, exclusive supply of nitrate increased tiller number in hydroponically-grown barley plants. Thereby, tiller number correlated positively with the root-to-shoot translocation rate of endogenous cytokinins. External supply of a synthetic cytokinin analog further stimulated tillering in nitrate-containing but not in urea-containing nutrient solution. When the cytokinin analog 6-benzylaminopurine riboside was externally supplied to roots, its translocation to shoots was 2.5 times higher in presence of nitrate than in presence of urea or ammonium, suggesting that cytokinin loading into the xylem is affected by different nitrogen forms. We then translated this finding to field scale, cultivated winter wheat in four environments, and confirmed that nitrate fertilization significantly increased tiller number in a dose-dependent manner. As assessed in 22 winter wheat cultivars, nitrogen form-dependent tiller formation was subject to substantial genotypic variation. We conclude that cytokinin-mediated signaling effects of fertilizer nitrogen forms can be employed as a management tool to regulate the tiller number in cereal crops.
format	article
author	Bernhard Bauer Nicolaus von Wirén
author_facet	Bernhard Bauer Nicolaus von Wirén
author_sort	Bernhard Bauer
title	Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms
title_short	Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms
title_full	Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms
title_fullStr	Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms
title_full_unstemmed	Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms
title_sort	modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/ddfacd6e8e7242f1807ca6e5dd1cd8fc
work_keys_str_mv	AT bernhardbauer modulatingtillerformationincerealcropsbythesignallingfunctionoffertilizernitrogenforms AT nicolausvonwiren modulatingtillerformationincerealcropsbythesignallingfunctionoffertilizernitrogenforms
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Modulating tiller formation in cereal crops by the signalling function of fertilizer nitrogen forms

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