GS1 — Sorghum bicolor

Summary

SbGS1 (SORBI_3001G451500) on sorghum chromosome 1 encodes a glutamine synthetase (EC 6.3.1.2) with a Gln_synt_N domain and a catalytic domain. The gene is associated with the ammonia assimilation cycle, nitrate assimilation, leaf senescence, embryo development ending in seed dormancy, response to abscisic acid, and blue light response. It has been linked to grain yield, grain filling period, photosynthetic rate, chlorophyll content, starch grain synthesis, flowering time, photoperiod-sensitive flowering, stomatal opening, and abscisic acid sensitivity. The product localises to the chloroplast thylakoid membrane, chloroplast envelope, chloroplast stroma, thylakoid, apoplast, plant-type cell wall, plant-type vacuole, and plasmodesmata. Studies of related genes in other species connect the family to nitrogen remobilisation, seed yield, drought and salt stress responses, and grain nitrogen content.