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Contributions of glume and awn to photosynthesis, (14)C assimilates and grain weight in wheat ears under drought stress

Ear photosynthesis plays a key role in wheat photosynthesis during the grain filling stage, particularly under drought stress. Thus, dissecting the responsibilities of the glume and awn in photosynthetic carbon fixation and assimilates transportation during the grain filling stage in spikes is imper...

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Detalles Bibliográficos
Autores principales: Li, Xiaorui, Tang, Yan, Zhou, Chunju, Lv, Jinyin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10597856/
https://www.ncbi.nlm.nih.gov/pubmed/37886759
http://dx.doi.org/10.1016/j.heliyon.2023.e21136
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author Li, Xiaorui
Tang, Yan
Zhou, Chunju
Lv, Jinyin
author_facet Li, Xiaorui
Tang, Yan
Zhou, Chunju
Lv, Jinyin
author_sort Li, Xiaorui
collection PubMed
description Ear photosynthesis plays a key role in wheat photosynthesis during the grain filling stage, particularly under drought stress. Thus, dissecting the responsibilities of the glume and awn in photosynthetic carbon fixation and assimilates transportation during the grain filling stage in spikes is imperative. In this study, the detachment of the glume (DG) and awn (DA) of a wheat variety (Pubing143) was used to estimate their influences on ear photosynthesis and dry matter distribution. Radioactive carbon-14 ((14)C) isotope was detected by a multifunctional liquid scintillation counting system. The accumulation of (14)C assimilates and their contributions to grain weight were then calculated. Under well-watered conditions, ear photosynthesis was reduced by 16.8 % and 46.2 % 25 d after anthesis (DAA) in the de-glumed control (DGC) and de-awned control (DAC) treatments, respectively, compared with the intact ear control (IEC). Under drought stress, ear photosynthesis was reduced by 46 % and 74.2 % at 25 DAA after removing the glume and awn, respectively. Under normal conditions, the number of (14)C assimilates of DGC, and DAC was reduced by 14.6 % and 20.9 % in grains at 25 DAA, respectively, compared with the IEC. Compared with IED, the (14)C assimilates of DGD, and DAD declined by 17.2 % and 27 %, respectively, in grains at 25 DAA under drought conditions. Under well-watered conditions, the grain weight per pot was reduced by 11.2 % and 25.4 % in the de-glumed control (DGC) and de-awned control (DAC) treatments, respectively, compared with the intact ear control (IEC). The grain weight per pot was further reduced after removing the glume and awn (16 % and 32.2 %, respectively) under drought stress. Furthermore, the awn contribution to grain weight was twice that of the glume. Our results suggest that the glume and awn of ears play prominent roles during grain filling in wheat, especially under drought stress, and that the awn is more crucial than the glume.
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spelling pubmed-105978562023-10-26 Contributions of glume and awn to photosynthesis, (14)C assimilates and grain weight in wheat ears under drought stress Li, Xiaorui Tang, Yan Zhou, Chunju Lv, Jinyin Heliyon Research Article Ear photosynthesis plays a key role in wheat photosynthesis during the grain filling stage, particularly under drought stress. Thus, dissecting the responsibilities of the glume and awn in photosynthetic carbon fixation and assimilates transportation during the grain filling stage in spikes is imperative. In this study, the detachment of the glume (DG) and awn (DA) of a wheat variety (Pubing143) was used to estimate their influences on ear photosynthesis and dry matter distribution. Radioactive carbon-14 ((14)C) isotope was detected by a multifunctional liquid scintillation counting system. The accumulation of (14)C assimilates and their contributions to grain weight were then calculated. Under well-watered conditions, ear photosynthesis was reduced by 16.8 % and 46.2 % 25 d after anthesis (DAA) in the de-glumed control (DGC) and de-awned control (DAC) treatments, respectively, compared with the intact ear control (IEC). Under drought stress, ear photosynthesis was reduced by 46 % and 74.2 % at 25 DAA after removing the glume and awn, respectively. Under normal conditions, the number of (14)C assimilates of DGC, and DAC was reduced by 14.6 % and 20.9 % in grains at 25 DAA, respectively, compared with the IEC. Compared with IED, the (14)C assimilates of DGD, and DAD declined by 17.2 % and 27 %, respectively, in grains at 25 DAA under drought conditions. Under well-watered conditions, the grain weight per pot was reduced by 11.2 % and 25.4 % in the de-glumed control (DGC) and de-awned control (DAC) treatments, respectively, compared with the intact ear control (IEC). The grain weight per pot was further reduced after removing the glume and awn (16 % and 32.2 %, respectively) under drought stress. Furthermore, the awn contribution to grain weight was twice that of the glume. Our results suggest that the glume and awn of ears play prominent roles during grain filling in wheat, especially under drought stress, and that the awn is more crucial than the glume. Elsevier 2023-10-17 /pmc/articles/PMC10597856/ /pubmed/37886759 http://dx.doi.org/10.1016/j.heliyon.2023.e21136 Text en © 2023 The Authors https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Research Article
Li, Xiaorui
Tang, Yan
Zhou, Chunju
Lv, Jinyin
Contributions of glume and awn to photosynthesis, (14)C assimilates and grain weight in wheat ears under drought stress
title Contributions of glume and awn to photosynthesis, (14)C assimilates and grain weight in wheat ears under drought stress
title_full Contributions of glume and awn to photosynthesis, (14)C assimilates and grain weight in wheat ears under drought stress
title_fullStr Contributions of glume and awn to photosynthesis, (14)C assimilates and grain weight in wheat ears under drought stress
title_full_unstemmed Contributions of glume and awn to photosynthesis, (14)C assimilates and grain weight in wheat ears under drought stress
title_short Contributions of glume and awn to photosynthesis, (14)C assimilates and grain weight in wheat ears under drought stress
title_sort contributions of glume and awn to photosynthesis, (14)c assimilates and grain weight in wheat ears under drought stress
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10597856/
https://www.ncbi.nlm.nih.gov/pubmed/37886759
http://dx.doi.org/10.1016/j.heliyon.2023.e21136
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