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The calcium sensor GhCaM7 promotes cotton fiber elongation by modulating reactive oxygen species (ROS) production

Tang, W.; Tu, L.; Yang, X.; Tan, J.; Deng, F.; Hao, J.; Guo, K.; Lindsey, K.; Zhang, X.


W. Tang

L. Tu

X. Yang

J. Tan

F. Deng

J. Hao

K. Guo

X. Zhang


Summary •Fiber elongation is the key determinant of fiber quality and output in cotton (Gossypium hirsutum). Although expression profiling and functional genomics provide some data, the mechanism of fiber development is still not well understood. •Here, a gene encoding a calcium sensor, GhCaM7, was isolated based on its high expression level relative to other GhCaMs in fiber cells at the fast elongation stage. The level of expression of GhCaM7 in the wild-type and the fuzzless/lintless mutant correspond to the presence and absence, respectively, of fiber initials. •Overexpressing GhCaM7 promotes early fiber elongation, whereas GhCaM7 suppression by RNAi delays fiber initiation and inhibits fiber elongation. Reactive oxygen species (ROS) play important roles in early fiber development. ROS induced by exogenous hydrogen peroxide (H2O2) and Ca2+ starvation promotes early fiber elongation. GhCaM7 overexpression fiber cells show increased ROS concentrations compared with the wild-type, while GhCaM7 RNAi fiber cells have reduced concentrations. Furthermore, we show that H2O2 enhances Ca2+ influx into the fiber and feedback-regulates the expression of GhCaM7. •We conclude that GhCaM7, Ca2+ and ROS are three important regulators involved in early fiber elongation. GhCaM7 might modulate ROS production and act as a molecular link between Ca2+ and ROS signal pathways in early fiber development.

Journal Article Type Article
Publication Date Apr 1, 2014
Deposit Date Apr 16, 2014
Journal New Phytologist
Print ISSN 0028-646X
Electronic ISSN 1469-8137
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 202
Issue 2
Pages 509-520
Keywords Calcium signaling, Calmodulin, Feedback regulation, Fiber Elongation, Gossypium hirsutum (cotton), Reactive oxygen species (ROS)
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