GLK1 — Solanum lycopersicum

Summary

SlGLK1 (SOLYC07G053630.4) on tomato chromosome 7 encodes a MYB-domain transcription factor of the GLK1/2-like family, with sequence-specific DNA binding and protein homodimerization activity. In tomato, SlGLK2 (a synonym) is associated with chloroplast development, fruit chlorophyll content, green shoulder formation, soluble solid content, tocopherol content, and fruit quality. The gene is associated with regulation of photosynthesis, tetrapyrrole and lycopene anabolism, flavonoid metabolism, chloroplast fission, and response to UV-A. Associations include fruit color, carotenoid and sugar content, leaf width, plant height, seed dormancy, nitrogen content, oxidative stress and abscisic acid sensitivity, disease tolerance, and salt tolerance. The protein localizes to the nucleus and cytoplasm. Studies of related genes in other species connect the family to chlorophyll biosynthesis, chloroplast biogenesis, photosynthesis, and responses to ABA, salinity, drought, and osmotic stress.