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In vivo imaging of Ca2+ accumulation during cotton fiber initiation using fluorescent indicator YC3.60

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Abstract

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Non-tip-focused Ca 2+ gradient indicated by genetically expressing a FRET-based calcium sensor YC3.60 was established in spherical expanding cotton fibers, which is vital for cotton fiber initiation.

Abstract

Cotton fiber is a single cell elongated from ovule epidermis. It is not only the most important natural fiber used in the textile industry but also an ideal model for studying cell differentiation and elongation. Before linear cell growth, cotton fibers undergo spherical expansion at the beginning of initiation. Ca2+, as an important secondary messenger, plays a central role in polarized cell growth including cotton fiber elongation. However, the role of Ca2+ in fiber initiation is far from well understood. In this paper, through ovule culture we demonstrate that Ca2+ is crucial for fiber initiation. Using transgenic cotton expressing the fluorescent Ca2+ indicator YC3.60, we show cellular and intracellular distribution of Ca2+ in cotton ovule epidermis and fiber cells. In the initiating fiber cell, Ca2+ accumulated mainly at the base of the cell, while in the fast elongating cell, the Ca2+ was enriched in the tip region. This cellular distribution of Ca2+ reported by YC3.60 was confirmed by the staining with a Ca2+-sensitive dye fluo-3/AM. Compared to the fluorescent dye staining, the YC3.60 system can reveal more detailed information on the intracellular distribution without photobleaching. Taken together, our data suggest that Ca2+ plays an important role in spherical expansion of cotton fiber initials.

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Acknowledgements

We would like to thank Dr. Megumi Iwano (Nara Institute of Science and Technology) and Dr. Atsushi Miyawaki (RIKEN Brain Science Institute) for kindly providing the plasmid pSLJAct1-YC3.60. This study was funded by the National Natural Science Foundation of China (31130039 to Y.P.), the Foundation for the Author of National Excellent Doctoral Dissertation of PR China (201466 to M.Z.), the Program for New Century Excellent Talents in University (to M.Z.) and the Natural Science Foundation of Chongqing, China (cstc2012jjjq80001 to M.Z.).

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Authors and Affiliations

  1. Biotechnology Research Center, Southwest University, No. 2 Tiansheng Rd, Beibei, Chongqing, 400716, People’s Republic of China

    Mi Zhang, Hui-zhen Cao, Lei Hou, Shui-qing Song, Jian-yan Zeng & Yan Pei

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  1. Mi Zhang
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  2. Hui-zhen Cao
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Correspondence to Yan Pei.

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Communicated by Kang Chong.

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Zhang, M., Cao, Hz., Hou, L. et al. In vivo imaging of Ca2+ accumulation during cotton fiber initiation using fluorescent indicator YC3.60. Plant Cell Rep 36, 911–918 (2017). https://doi.org/10.1007/s00299-017-2122-3

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  • DOI: https://doi.org/10.1007/s00299-017-2122-3

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