Table 1.
Overview of the identified CPKs in pollen.
| Namea | Gene IDb | Locationc | Targetsd | Physiological relevancee | Referencesf |
|---|---|---|---|---|---|
| Arabidopsis thaliana | |||||
| AtCPK2 | AT3G10660 | ER, MB | AtRBOHD/F (PM), AtSLAH3 (PM), ALMT12/13/14 (PM) | Reduced ROS production in cpk1,2 double mutants; reduced anion currents and fluxes are reduced in cpk2,20 double mutants | Lu and Hrabak, 2002; Harper et al., 2004; Gao et al., 2013; Gutermuth et al., 2013, 2018 |
| AtCPK14 | AT2G41860 | MB | - | - | Harper et al., 2004 |
| AtCPK16 | AT2G17890 | PM | ACA8 (PM), AtDi19-2 (N, C) | - | Curran et al., 2011; Giacometti et al., 2012 |
| AtCPK17 | AT5G12180 | PM | - | Reduced pollen transmission efficiency in cpk17/34 double mutants | Myers et al., 2009 |
| AtCPK20 | AT2G38910 | S, MB | AtSLAH3 (PM), ALMT12/13/14 (PM) | Anion currents and fluxes are reduced in cpk2,20 double mutants | Gutermuth et al., 2013, 2018 |
| AtCPK24 | AT2G31500 | PM, N | SPIK,14-3-3 | Impairing the Ca2+-dependent inhibition of K+ in currents and PT elongation | Zhao et al., 2013; Swatek et al., 2014 |
| AtCPK26 | AT4G38230 | N, C | - | - | Harper et al., 2004 |
| AtCPK34 | AT5G19360 | PM | NIP4;1/2 | Fewer seeds per silique and reduced pollen germination and PT length in nip4;1/2 mutant | Di Giorgio et al., 2016 |
| Zea mays | |||||
| ZmCPK20 | GRMZM2G365815 | - | - | - | Estruch et al., 1994 |
| ZmCPK32 | GRMZM2G332660 | PM | - | Inhibition of PT growth by transient expression of ZmCPK32 in tobacco pollen | Li et al., 2018a |
| Petunia inflate | |||||
| PiCPK1 | DQ147913 | PM | PiSCP1 | Loss of growth polarity Inhibited pollen germination and tube growth | Yoon et al., 2006; Guo et al., 2013 |
| PiCPK2 | DQ147912 | P | PiSCP1 | Inhibition of PT extension but did not affect growth polarity or germination rates | Guo et al., 2013 |
| Oryza sativa | |||||
| OsCPK25 | Os11g04170 | - | - | - | Wang et al., 2011; Tang and Page, 2013 |
| OsCPK26 | Os12g03970 | - | - | - | Wang et al., 2011; Tang and Page, 2013 |
a
Short name.
b
Gene identifier according to TAIR (A. thaliana CDPKs) or GeneBank (other species).
c
Subcellular localization published in the literature: S, soluble; MB, membranes; N, nucleus; C, cytoplasm; P, peroxisomes; PM, plasma membrane; ER, endoplasmic reticulum.
d
Lists of published CPK target genes with their published subcellular localization in parentheses.
e
Physiological relevance is defined by phenotypes of knockdown or overexpressing lines, when available, or other physiological traits.
f
Corresponding references.