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. Author manuscript; available in PMC: 2022 Dec 19.
Published in final edited form as: Prog Lipid Res. 2022 Feb 5;86:101158. doi: 10.1016/j.plipres.2022.101158

Fig. 4.

Fig. 4.

PI-PLC-mediated signaling under stress conditions. The black arrow indicates established links while the green arrow represents putative links. PI-PLCs-induced signaling events or phenotypic effects should include PI-PLC-generated phosphoinositides phosphates. PI-PLC3/PI-PLC5 confer drought tolerance possibly through calcium-dependent pathways or α-subunit of heterotrimeric G protein. PI-PLC2 is involved in early flowering. Heat stress induces PI-PLC9 activity and produced IP3 which may cause calcium ions oscillations. PLCδ interaction with Gα and Gβ subunits of heterotrimeric G-protein is already known but whether this interaction exists in response to salinity and heat stress is not known yet. The PI-PLC generated IP3 regulates pollen growth probably by regulating the actin dynamics, while the same phenotype might be regulated by PI-PLC produced DAG through DAG-protein interaction. Gα subunit of heterotrimeric G protein and Clo3 also interact with PI-PLC1 and this interaction is further strengthened by high Ca2+ levels in cell. Distinct functions of DAG and PA in PI-PLC signaling pathway are not clearly known but the Rac/Rop signaling could be modulated by DAG and PA, leading to cell cycle regulation which controls pollen tube growth.