SIS7 — Oryza sativa Japonica

Summary

OS12G0617400 (SIS7/NCED3) encodes a 9-cis-epoxycarotenoid dioxygenase with carotenoid dioxygenase activity, a key enzyme in abscisic acid (ABA) biosynthesis. In rice, this gene is associated with salt, cold, drought, chilling, and aluminium toxicity tolerance, as well as grain size, seed dormancy, embryo development, senescence, and resistance to brown planthopper. It is linked to ABA accumulation and breakdown, stomatal closure, and responses to abiotic and biotic stress. The gene has been connected to grain yield, grain length, grain weight, spikelet fertility, chlorophyll content, photosynthetic rate, leaf weight, specific leaf weight, and anthesis time. It is also associated with seed maturation, seed dormancy, anther development, and response to red or far-red light. The protein localises to the thylakoid and chloroplast thylakoid membrane. Studies of related genes in other species link the family to drought tolerance, ABA content under drought, and transpiration rate.