SIS7 — Oryza sativa Japonica

Summary

OsSIS7 (also known as NCED3, NCED5, or NCED6) on rice chromosome 3 encodes a 9-cis-epoxycarotenoid dioxygenase with carotenoid dioxygenase activity, a key enzyme in abscisic acid (ABA) biosynthesis. The gene is associated with abiotic stress tolerance, including salt, cold, chilling, drought, and aluminium toxicity tolerance, as well as biotic stress resistance, particularly against brown planthopper. It is linked to grain size, seed dormancy, embryo development, senescence, and plant growth. The encoded protein localises to the thylakoid and chloroplast stroma. Associations also extend to ABA accumulation, stomatal closure, shoot branching, and responses to red or far-red light. Additional connections include grain yield, spikelet fertility, tiller number, specific leaf weight, photosynthetic rate, and salinity tolerance.