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Open AccessCommunication

Plasma Membrane-Localized Calcium Pumps and Copines Coordinately Regulate Pollen Germination and Fertility in Arabidopsis

1
State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China
2
Department of Anatomy, The Second Military Medical University, Shanghai 200433, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2018, 19(6), 1774; https://doi.org/10.3390/ijms19061774
Received: 9 May 2018 / Revised: 7 June 2018 / Accepted: 13 June 2018 / Published: 15 June 2018
(This article belongs to the Special Issue Calcium Signals in Plant Cells)
Calcium plays an important role in plant growth, development, and response to environmental stimuli. Copines are conserved plasma membrane-localized calcium-binding proteins which regulate plant immune responses and development. In this study, we found that copine proteins BON2 and BON3, the paralogs of BON1, physically interact with calcium pumps ACA8 and ACA10 in Arabidopsis. Notably, ACA9, the closest homologue of ACA8 and ACA10 functioning in pollen tube growth, interacts with all three copines. This is consistent with the protein–protein interactions between the two protein families, the aca8, aca10, aca8/aca10, bon1/2/3 mutants as well as aca9 mutant exhibited defects on pollen germination and seed production. Taken together, plasma membrane-localized interacting calcium pumps and copines coordinately control pollen tube growth, likely through manipulating calcium efflux. View Full-Text
Keywords: autoinhibited Ca2+ ATPase (ACA); calcium; calcium pump; copine; fertility; pollen germination autoinhibited Ca2+ ATPase (ACA); calcium; calcium pump; copine; fertility; pollen germination
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Li, Y.; Guo, J.; Yang, Z.; Yang, D.-L. Plasma Membrane-Localized Calcium Pumps and Copines Coordinately Regulate Pollen Germination and Fertility in Arabidopsis. Int. J. Mol. Sci. 2018, 19, 1774.

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