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Low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (Triticum aestivum L.)

Shoot branching is inhibited by a low red/far-red ratio (R/FR). Prior studies have shown that the R/FR suppressed Arabidopsis thaliana branching by promotes bud abscisic acid (ABA) accumulation directly. Given that wheat tiller buds are wrapped in leaf sheaths and may not respond rapidly to a R/FR,...

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Autores principales: Lei, Kangqi, Tan, Qingwen, Zhu, Liqi, Xu, Libing, Yang, Shuke, Hu, Jinling, Gao, Lijun, Hou, Pan, Shao, Yuhang, Jiang, Dong, Cao, Weixing, Dai, Tingbo, Tian, Zhongwei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9773260/
https://www.ncbi.nlm.nih.gov/pubmed/36570939
http://dx.doi.org/10.3389/fpls.2022.971003
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author Lei, Kangqi
Tan, Qingwen
Zhu, Liqi
Xu, Libing
Yang, Shuke
Hu, Jinling
Gao, Lijun
Hou, Pan
Shao, Yuhang
Jiang, Dong
Cao, Weixing
Dai, Tingbo
Tian, Zhongwei
author_facet Lei, Kangqi
Tan, Qingwen
Zhu, Liqi
Xu, Libing
Yang, Shuke
Hu, Jinling
Gao, Lijun
Hou, Pan
Shao, Yuhang
Jiang, Dong
Cao, Weixing
Dai, Tingbo
Tian, Zhongwei
author_sort Lei, Kangqi
collection PubMed
description Shoot branching is inhibited by a low red/far-red ratio (R/FR). Prior studies have shown that the R/FR suppressed Arabidopsis thaliana branching by promotes bud abscisic acid (ABA) accumulation directly. Given that wheat tiller buds are wrapped in leaf sheaths and may not respond rapidly to a R/FR, systemic cytokinin (CTK) may be more critical. Here, systemic hormonal signals including indole-3-acetic acid (IAA), gibberellins (GA) and CTK and bud ABA signals in wheat were tested under a low R/FR. The results showed that a low R/FR reduced the percentage of tiller occurrence of tiller IV and the tiller number per plant. The low R/FR did not rapidly induced ABA accumulation in the tiller IV because of the protection of the leaf sheath and had little effect on IAA content and signaling in the tiller nodes. The significant change in the CTK levels was observed earlier than those of other hormone (ABA, IAA and GA) and exogenous cytokinin restored the CTK levels and tiller number per plant under low R/FR conditions. Further analysis revealed that the decrease in cytokinin levels was mainly associated with upregulation of cytokinin degradation genes (TaCKX5, TaCKX11) in tiller nodes. In addition, exposure to a decreased R/FR upregulated the expression of GA biosynthesis genes (TaGA20ox1, TaGA3ox2), resulting in elevated GA levels, which might further promote CTK degradation in tiller nodes and inhibit tillering. Therefore, our results provide evidence that the enhancement of cytokinin degradation is a novel mechanism underlying the wheat tillering response to a low R/FR.
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spelling pubmed-97732602022-12-23 Low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (Triticum aestivum L.) Lei, Kangqi Tan, Qingwen Zhu, Liqi Xu, Libing Yang, Shuke Hu, Jinling Gao, Lijun Hou, Pan Shao, Yuhang Jiang, Dong Cao, Weixing Dai, Tingbo Tian, Zhongwei Front Plant Sci Plant Science Shoot branching is inhibited by a low red/far-red ratio (R/FR). Prior studies have shown that the R/FR suppressed Arabidopsis thaliana branching by promotes bud abscisic acid (ABA) accumulation directly. Given that wheat tiller buds are wrapped in leaf sheaths and may not respond rapidly to a R/FR, systemic cytokinin (CTK) may be more critical. Here, systemic hormonal signals including indole-3-acetic acid (IAA), gibberellins (GA) and CTK and bud ABA signals in wheat were tested under a low R/FR. The results showed that a low R/FR reduced the percentage of tiller occurrence of tiller IV and the tiller number per plant. The low R/FR did not rapidly induced ABA accumulation in the tiller IV because of the protection of the leaf sheath and had little effect on IAA content and signaling in the tiller nodes. The significant change in the CTK levels was observed earlier than those of other hormone (ABA, IAA and GA) and exogenous cytokinin restored the CTK levels and tiller number per plant under low R/FR conditions. Further analysis revealed that the decrease in cytokinin levels was mainly associated with upregulation of cytokinin degradation genes (TaCKX5, TaCKX11) in tiller nodes. In addition, exposure to a decreased R/FR upregulated the expression of GA biosynthesis genes (TaGA20ox1, TaGA3ox2), resulting in elevated GA levels, which might further promote CTK degradation in tiller nodes and inhibit tillering. Therefore, our results provide evidence that the enhancement of cytokinin degradation is a novel mechanism underlying the wheat tillering response to a low R/FR. Frontiers Media S.A. 2022-12-08 /pmc/articles/PMC9773260/ /pubmed/36570939 http://dx.doi.org/10.3389/fpls.2022.971003 Text en Copyright © 2022 Lei, Tan, Zhu, Xu, Yang, Hu, Gao, Hou, Shao, Jiang, Cao, Dai and Tian https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Lei, Kangqi
Tan, Qingwen
Zhu, Liqi
Xu, Libing
Yang, Shuke
Hu, Jinling
Gao, Lijun
Hou, Pan
Shao, Yuhang
Jiang, Dong
Cao, Weixing
Dai, Tingbo
Tian, Zhongwei
Low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (Triticum aestivum L.)
title Low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (Triticum aestivum L.)
title_full Low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (Triticum aestivum L.)
title_fullStr Low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (Triticum aestivum L.)
title_full_unstemmed Low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (Triticum aestivum L.)
title_short Low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (Triticum aestivum L.)
title_sort low red/far-red ratio can induce cytokinin degradation resulting in the inhibition of tillering in wheat (triticum aestivum l.)
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9773260/
https://www.ncbi.nlm.nih.gov/pubmed/36570939
http://dx.doi.org/10.3389/fpls.2022.971003
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