Cargando…

Variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number

Grain yield and mineral nutrient concentration in cereal crops are usually inversely correlated, undermining biofortification efforts. Here, sink size, expressed as kernel number per cob, was manipulated by controlling the time when the silks of sweetcorn (Zea mays) cv. Hybrix 5 and var. HiZeax 1031...

Descripción completa

Detalles Bibliográficos
Autores principales: Cheah, Zhong Xiang, O’Hare, Tim J, Harper, Stephen M, Bell, Michael J
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7410176/
https://www.ncbi.nlm.nih.gov/pubmed/32442251
http://dx.doi.org/10.1093/jxb/eraa244
_version_ 1783568188307406848
author Cheah, Zhong Xiang
O’Hare, Tim J
Harper, Stephen M
Bell, Michael J
author_facet Cheah, Zhong Xiang
O’Hare, Tim J
Harper, Stephen M
Bell, Michael J
author_sort Cheah, Zhong Xiang
collection PubMed
description Grain yield and mineral nutrient concentration in cereal crops are usually inversely correlated, undermining biofortification efforts. Here, sink size, expressed as kernel number per cob, was manipulated by controlling the time when the silks of sweetcorn (Zea mays) cv. Hybrix 5 and var. HiZeax 103146 were exposed to pollen. Twelve other varieties were manually pollinated to achieve the maximum potential kernel number per cob, and kernel Zn concentration was correlated with kernel number and kernel mass. As kernel number increased, kernel Zn concentration decreased, with the decrease occurring to similar extents in the embryo tissue and the rest of the kernel. However, total kernel Zn accumulated per cob increased with increasing kernel number, as the small decreases in individual kernel Zn concentration were more than offset by increases in kernel number. When both kernel number and mass were considered, 90% of the variation in kernel Zn concentration was accounted for. Differential distribution of assimilates and Zn to sweetcorn cobs led to significant decreases in kernel Zn concentration with increasing kernel number. This suggests there will be challenges to achieving high kernel Zn concentrations in modern high-yielding sweetcorn varieties unless genotypes with higher Zn translocation rates into kernels can be identified.
format Online
Article
Text
id pubmed-7410176
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Oxford University Press
record_format MEDLINE/PubMed
spelling pubmed-74101762020-08-10 Variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number Cheah, Zhong Xiang O’Hare, Tim J Harper, Stephen M Bell, Michael J J Exp Bot Research Papers Grain yield and mineral nutrient concentration in cereal crops are usually inversely correlated, undermining biofortification efforts. Here, sink size, expressed as kernel number per cob, was manipulated by controlling the time when the silks of sweetcorn (Zea mays) cv. Hybrix 5 and var. HiZeax 103146 were exposed to pollen. Twelve other varieties were manually pollinated to achieve the maximum potential kernel number per cob, and kernel Zn concentration was correlated with kernel number and kernel mass. As kernel number increased, kernel Zn concentration decreased, with the decrease occurring to similar extents in the embryo tissue and the rest of the kernel. However, total kernel Zn accumulated per cob increased with increasing kernel number, as the small decreases in individual kernel Zn concentration were more than offset by increases in kernel number. When both kernel number and mass were considered, 90% of the variation in kernel Zn concentration was accounted for. Differential distribution of assimilates and Zn to sweetcorn cobs led to significant decreases in kernel Zn concentration with increasing kernel number. This suggests there will be challenges to achieving high kernel Zn concentrations in modern high-yielding sweetcorn varieties unless genotypes with higher Zn translocation rates into kernels can be identified. Oxford University Press 2020-08-06 2020-05-22 /pmc/articles/PMC7410176/ /pubmed/32442251 http://dx.doi.org/10.1093/jxb/eraa244 Text en © The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Papers
Cheah, Zhong Xiang
O’Hare, Tim J
Harper, Stephen M
Bell, Michael J
Variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number
title Variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number
title_full Variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number
title_fullStr Variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number
title_full_unstemmed Variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number
title_short Variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number
title_sort variation in zinc concentration of sweetcorn kernels reflects source–sink dynamics influenced by kernel number
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7410176/
https://www.ncbi.nlm.nih.gov/pubmed/32442251
http://dx.doi.org/10.1093/jxb/eraa244
work_keys_str_mv AT cheahzhongxiang variationinzincconcentrationofsweetcornkernelsreflectssourcesinkdynamicsinfluencedbykernelnumber
AT oharetimj variationinzincconcentrationofsweetcornkernelsreflectssourcesinkdynamicsinfluencedbykernelnumber
AT harperstephenm variationinzincconcentrationofsweetcornkernelsreflectssourcesinkdynamicsinfluencedbykernelnumber
AT bellmichaelj variationinzincconcentrationofsweetcornkernelsreflectssourcesinkdynamicsinfluencedbykernelnumber