Different grain-filling rates explain grain-weight differences along the wheat ear

Thousand grain weight is one of the components determining wheat grain yield. It represents the average value of individual grain weights which depends on position within the ear and on positon within the spikelet. Our objective was to quantify the influences of individual floret anthesis date, of c...

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Autores principales: Baillot, Nadège, Girousse, Christine, Allard, Vincent, Piquet-Pissaloux, Agnès, Le Gouis, Jacques
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6312219/
https://www.ncbi.nlm.nih.gov/pubmed/30596702
http://dx.doi.org/10.1371/journal.pone.0209597
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author Baillot, Nadège
Girousse, Christine
Allard, Vincent
Piquet-Pissaloux, Agnès
Le Gouis, Jacques
author_facet Baillot, Nadège
Girousse, Christine
Allard, Vincent
Piquet-Pissaloux, Agnès
Le Gouis, Jacques
author_sort Baillot, Nadège
collection PubMed
description Thousand grain weight is one of the components determining wheat grain yield. It represents the average value of individual grain weights which depends on position within the ear and on positon within the spikelet. Our objective was to quantify the influences of individual floret anthesis date, of carpel weight at anthesis and of rate and duration of grain filling, on variation in individual final grain weight. Two bread wheat cultivars were grown in a greenhouse and their ears were sampled from anthesis through to harvest. Each ear was divided into three parts—basal, central and apical—where the two proximal grains were dissected from each of two spikelets. We analysed (i) the flowering time shift within the ear and within the spikelet; and (ii) the growth kinetics during grain filling in relation to position along the ear. For both cultivars, florets located in the central part of the ear were the first to reach anthesis followed by those in the apical part and then the basal part. Within a spikelet, the floret located nearest the rachis flowered first followed by the more distal ones. We found no significant systematic effect of flowering time-shift on final grain weight. Nevertheless, grains in the central part were heavier than the basal ones (9.75% smaller) and than the apical ones (18.25% smaller). These differences were explained mainly by differences in mean grain filling rates. Analysis of growth kinetics enabled an improved explanation of the variability of individual grain weight along the ear.
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spelling pubmed-63122192019-01-08 Different grain-filling rates explain grain-weight differences along the wheat ear Baillot, Nadège Girousse, Christine Allard, Vincent Piquet-Pissaloux, Agnès Le Gouis, Jacques PLoS One Research Article Thousand grain weight is one of the components determining wheat grain yield. It represents the average value of individual grain weights which depends on position within the ear and on positon within the spikelet. Our objective was to quantify the influences of individual floret anthesis date, of carpel weight at anthesis and of rate and duration of grain filling, on variation in individual final grain weight. Two bread wheat cultivars were grown in a greenhouse and their ears were sampled from anthesis through to harvest. Each ear was divided into three parts—basal, central and apical—where the two proximal grains were dissected from each of two spikelets. We analysed (i) the flowering time shift within the ear and within the spikelet; and (ii) the growth kinetics during grain filling in relation to position along the ear. For both cultivars, florets located in the central part of the ear were the first to reach anthesis followed by those in the apical part and then the basal part. Within a spikelet, the floret located nearest the rachis flowered first followed by the more distal ones. We found no significant systematic effect of flowering time-shift on final grain weight. Nevertheless, grains in the central part were heavier than the basal ones (9.75% smaller) and than the apical ones (18.25% smaller). These differences were explained mainly by differences in mean grain filling rates. Analysis of growth kinetics enabled an improved explanation of the variability of individual grain weight along the ear. Public Library of Science 2018-12-31 /pmc/articles/PMC6312219/ /pubmed/30596702 http://dx.doi.org/10.1371/journal.pone.0209597 Text en © 2018 Baillot et al 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 use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Baillot, Nadège
Girousse, Christine
Allard, Vincent
Piquet-Pissaloux, Agnès
Le Gouis, Jacques
Different grain-filling rates explain grain-weight differences along the wheat ear
title Different grain-filling rates explain grain-weight differences along the wheat ear
title_full Different grain-filling rates explain grain-weight differences along the wheat ear
title_fullStr Different grain-filling rates explain grain-weight differences along the wheat ear
title_full_unstemmed Different grain-filling rates explain grain-weight differences along the wheat ear
title_short Different grain-filling rates explain grain-weight differences along the wheat ear
title_sort different grain-filling rates explain grain-weight differences along the wheat ear
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6312219/
https://www.ncbi.nlm.nih.gov/pubmed/30596702
http://dx.doi.org/10.1371/journal.pone.0209597
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