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, Honghai Zhu College of Agriculture, Nanjing Agricultural University , Nanjing , China Jinhua Academy, Zhejiang Chinese Medical University , Jinhua , China Search for other works by this author on: Oxford Academic Wei Hu College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic Yuxia Li College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic Jie Zou College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic Jiaqi He College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic Youhua Wang College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic Yali Meng College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic Binglin Chen College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic Wenqing Zhao College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic Shanshan Wang College of Agriculture, Nanjing Agricultural University , Nanjing , China Search for other works by this author on: Oxford Academic
Zhiguo Zhou College of Agriculture, Nanjing Agricultural University , Nanjing , China Correspondence: giscott@njau.edu.cn Search for other works by this author on: Oxford Academic
https://orcid.org/0000-0003-2895-0879 Journal of Experimental Botany, Volume 75, Issue 11, 7 June 2024, Pages 3579–3595, https://doi.org/10.1093/jxb/erae108
Published:
12 March 2024
Article history
Received:
26 July 2023
Editorial decision:
06 March 2024
Accepted:
11 March 2024
Published:
12 March 2024
Corrected and typeset:
08 April 2024
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Honghai Zhu, Wei Hu, Yuxia Li, Jie Zou, Jiaqi He, Youhua Wang, Yali Meng, Binglin Chen, Wenqing Zhao, Shanshan Wang, Zhiguo Zhou, Drought decreases cotton fiber strength by altering sucrose flow route, Journal of Experimental Botany, Volume 75, Issue 11, 7 June 2024, Pages 3579–3595, https://doi.org/10.1093/jxb/erae108
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Abstract
The potential mechanisms by which drought restricts cotton fiber cell wall synthesis and fiber strength are still not fully understood. Herein, drought experiments were conducted using two cultivars of upland cotton (Gossypium hirsutum), Dexiamian 1 (drought-tolerant) and Yuzaomian 9110 (drought-sensitive). Results showed that drought notably reduced sucrose efflux from cottonseed coats to fibers by down-regulating the expression of GhSWEET10 and GhSWEET15 in outer cottonseed coats, leading to enhanced sucrose accumulation in cottonseed coats but decreased sucrose accumulation in fibers. Within cotton fibers, drought restricted the hydrolysis of sucrose to uridine-5ʹ-diphosphoglucose by suppressing sucrose synthase activity, and drought favored the conversion of uridine-5ʹ-diphosphoglucose to β-1,3-glucan rather than cellulose by up-regulating GhCALS5. Hence, cellulose content was reduced, which was the main reason for the decreased fiber strength under drought. Moreover, drought promoted lignin synthesis by up-regulating the expression of Gh4CL4, GhPAL9, GhCCR5, GhCAD11, and GhCOMT6, which partly offset the negative influence of reduced cellulose content on fiber strength. Compared with Yuzaomian 9110, the drought-tolerance of Dexiamian 1 was evidenced by the following under drought conditions: (i) greater sucrose flow from seedcoat to fiber, (ii) less β-1,3-glucan accumulation, and (iii) more lignin biosynthesis. Overall, this study provides new insights into the mechanism of reduced cotton fiber strength induced by drought.
Cellulose synthesis, fiber strength, Gossypium hirsutum L., lignin, seed coat, sucrose transport
© The Author(s) 2024. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.
This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/pages/standard-publication-reuse-rights)
Issue Section:
Research Papers > Plant—Environment Interactions
Editor: Bertrand Muller Bertrand Muller Editor INRAE-Montpellier , France Search for other works by this author on: Oxford Academic
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