S17P — Cucumis sativus

Summary

CSA_5G198220 (symbol S17P, also known as SBPASE) in cucumber (Cucumis sativus) on chromosome 5 encodes a sedoheptulose-bisphosphatase (SBPase) with fructose 1,6-bisphosphate 1-phosphatase activity and metal binding capability. This enzyme is associated with the Calvin cycle, reductive pentose-phosphate cycle, gluconeogenesis, and carbohydrate, sucrose, and starch anabolism, as well as photorespiration, ascorbate-glutathione cycling, and detoxification. The protein localizes to the chloroplast stroma, thylakoid, chloroplast envelope, apoplast, and cytosol. The gene is linked to numerous agronomic traits including net photosynthetic rate, quantum yield, chlorophyll content, plant height, stem diameter, root length, sugar and protein content, relative growth rate, and stomatal resistance. It is also associated with oxidative stress response, CO2 fixation, leaf senescence, and photosynthetic carbon metabolism. Studies of related genes in other species link the SBPase family to photosynthetic efficiency, chilling tolerance, cadmium stress tolerance, seed yield, and chloroplast biogenesis.