TABLE 1.

The relationship between aquaporins and stomatal movement.

Genes	Localization	Species	Regulation	Substrate	References
SunTIP7	Guard cell	Sunflower	Diurnal rhythm of expression		Sarda et al. (1997)
VfPIP1 OE	Epidermal peels	Arabidopsis	Stomata closed faster under ABA and dark treatments		Cui et al. (2008)
Atpip2;1 KO	Epidermal peels		Stomata closed slower under ABA treatment, no difference under [CO2] changing	H2O and H2O2	Grondin et al. (2015)
Atpip2;1 KO	Epidermal peels + intact leaf		Stomatal aperture and movement no differences under [CO2] changing and ABA treatments	H2O and CO2	Wang et al. (2016)
Atpip2;1 KO	Epidermal peels		Stomata closed slower under ABA and flg22 treatments	H2O and H2O2	Rodrigues et al. (2017)
Atpip1;1/pip1;2/pip2;1/pip2;2 KO	Epidermal peels + intact leaf		Stomatal aperture and movement no differences under ABA treatment		Ceciliato et al. (2019)
ZmPIPs	Stomata	Maize	Diurnal rhythm of expression	H2O and CO2	Heinen et al. (2014)
ZmPIPs	Intact leaf		Expression regulated by [CO2] changing and carbonic anhydrase activity		Kolbe et al. (2019)
MdPIP1;3 OE	Intact leaf	Tomato	Stomata closed faster under drought stress		Wang et al. (2017)
GmPIP1;6 OE	Intact leaf	Soybean	Stomata closed slower under salt stress		Zhou et al. (2014)
PIPs & TIPs	Stomata	Populus	Expression regulated by diurnal rhythm and water stress		Durand et al. (2020)

The PIP and TIP isoforms are constitutively expressed under the control of the 35S promoter and silenced by transposon or T-DNA insertion.