Journal
PLANT SCIENCE
Volume 256, Issue -, Pages 196-207Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2017.01.001
Keywords
Cotton (Gossypium hirsutum L); Elevated temperature; Waterlogging; Fiber elongation; Osmotically active solutes; SuSy
Categories
Funding
- National Natural Science Foundation of China [31630051, 31371583, 31271654]
- Jiangsu Collaborative Innovation Center for Modern Crop Production (JCIC-MCP)
- China Agriculture Research System [CARS-18-20]
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Soil waterlogging events and high temperature conditions occur frequently in the Yangtze River Valley, yet the effects of these co-occurring stresses on fiber elongation have received little attention. In the current study, the combined effect of elevated temperature (ET) and soil waterlogging (SW) more negatively affected final fiber length (reduced by 5.4%-11.3%) than either stress alone by altering the composition of osmotically active solutes (sucrose, malate, and K*), where SW had the most pronounced effect. High temperature accelerated early fiber development, but limited the duration of elongation, thereby limiting final fiber length. Treatment of ET alone altered fiber sucrose content mainly through decreased source strength and the expression of the sucrose transporter gene GhSUT-1, making sucrose availability the primary determinant of final fiber length under ET. Waterlogging stress alone decreased source strength, down-regulated GhSUT-1 expression and enhanced SuSy catalytic activity for sucrose reduction. Waterlogging treatment alone also limited fiber malate production by down-regulating GhPEPC-1 epsilon i-2. However, combined elevated temperature and waterlogging limited primary cell wall synthesis by affecting GhCESAs genes and showed a negative impact on all three major osmotic solutes through the regulation of GhSUT-1, GhPEPC-1 &- 2 and GhKT-1 expression and altered SuSy activity, which functioned together to produce a shorter fiber length. (C) 2017 Elsevier B.V. All rights reserved.
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