Ectopic expression of SsPETE2, a plastocyanin from Suaeda salsa, improves plant tolerance to oxidative stress

Here comes the sun: How optimization of photosynthetic light reactions can boost crop yields

“…Attempts have been made to overexpress plastocyanin genes in Arabidopsis, which indeed resulted in enhanced biomass production of up to 1.6-fold compared to the wild type, even though photosynthetic parameters were similar to wild type levels and no improvement of photosynthetic capacity could be observed (Pesaresi et al, 2009). This phenomenon could possibly be explained with the newly discovered role of plant plastocyanins in oxidative stress tolerance (Zhou et al, 2018). Plastocyanins are copperbinding proteins and expression of the PetE genes is highly dependent on copper availability.…”

Adaptation of the Euhalophyte Suaeda salsa to High-Salinity Conditions

“…The Arabidopsis thaliana pete1 and pete2 mutants displayed increased sensitivity to ROS, but this phenotype was restored by the expression of SsPETE2. These findings demonstrate that PETEs from S. salsa participate in oxidative stress tolerance together with the regulation of copper metabolism under stress conditions (Zhou et al 2018).…”

“…Finally, the plastocyanin gene from S. salsa (SsPETE2) participates in oxidative stress responses in addition to copper homeostasis. SsPETE2 was upregulated in S. salsa plants exposed to oxidative stress, and transgenic Arabidopsis thaliana plants heterologously expressing this gene displayed increased oxidative stress tolerance compared to the wild type (Zhou et al 2018). The Arabidopsis thaliana pete1 and pete2 mutants displayed increased sensitivity to ROS, but this phenotype was restored by the expression of SsPETE2.…”

Copper and iron metabolism in Ostreococcus tauri – the role of phytotransferrin, plastocyanin and a chloroplast copper-transporting ATPase

“…2 Such alternative function is supported by the recent finding that plastocyanin improves oxidative stress tolerance by regulating copper homeostasis under stress conditions. 28 Copper has to be shuttled efficiently from the cytosol into the chloroplast to ensure metalation of stromal Cu/Zn SOD and luminal plastocyanin. 29 This becomes even more important under copper deficiency, when distributable copper in the cytosol is sparse.…”