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Calreticulin expression in relation to exchangeable Ca(2+) level that changes dynamically during anthesis, progamic
Robert Lenartowski1, Anna Suwińska, Marta Lenartowska
1Laboratory of Isotope and Instrumental Analysis, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, Toruń, Poland, rlenart@umk.pl.
Planta
|September 29, 2014
Summary
Calreticulin (CRT) acts as a mobile calcium store in plants, crucial for sexual reproduction. This study reveals CRT
Area of Science:
- Plant reproductive biology
- Cellular calcium signaling
- Molecular plant science
Background:
- Calcium ions (Ca2+) are vital for plant sexual reproduction.
- The precise mechanisms and storage sites for mobile Ca2+ during pollen-pistil interactions remain unclear.
- Calreticulin (CRT) is a Ca2+-buffering protein capable of binding and sequestering Ca2+.
Purpose of the Study:
- To investigate the role and localization of calreticulin (CRT) as a mobile calcium store during plant reproduction.
- To understand how CRT expression and distribution correlate with dynamic Ca2+ levels during key reproductive events.
- To elucidate the function of CRT in maintaining calcium homeostasis essential for angiosperm generative reproduction.
Main Methods:
- Analysis of Petunia hybrida CRT gene (PhCRT) expression patterns.
- Immunolocalization studies to determine CRT protein distribution in reproductive tissues.
- Immunogold electron microscopy to identify specific subcellular localization of CRT.
- Correlation of CRT localization with Ca2+ distribution.
Main Results:
- Elevated CRT expression was observed during anthesis, pollination, sperm cell deposition, and fertilization.
- CRT predominantly localized to the endoplasmic reticulum and Golgi compartments in pistil, pollen, and ovule cells.
- CRT distribution was found to correspond with loosely bound Ca2+ and showed selective localization within nuclear sub-domains.
- This is the first study to demonstrate CRT's specific nuclear sub-domain distribution.
Conclusions:
- Calreticulin (CRT) functions as a mobile intracellular store for easily releasable Ca2+ during plant sexual reproduction.
- CRT plays a critical role in regulating Ca2+ homeostasis in specific cellular compartments, including the nucleus.
- CRT's dynamic expression and localization highlight its importance in managing Ca2+ signaling throughout angiosperm generative reproduction.
