SIS7 — Triticum aestivum

Summary

TRAESCS5B02G029300 (TaSIS7) on bread wheat chromosome 5B encodes a carotenoid dioxygenase with 9-cis-epoxycarotenoid dioxygenase activity, a metal-binding enzyme. It is associated with abscisic acid (ABA) biosynthesis and homeostasis, seed dormancy, and responses to drought, salinity, cold, and osmotic stress. The gene is linked to traits including grain yield, grain protein content, harvest index, plant height, tiller number, ear number, root weight and length, flag leaf senescence, anthesis time, seed size, and photosynthetic rate. It localises to the chloroplast thylakoid membrane and stroma, and is associated with processes such as carotene breakdown, lycopene and beta-carotene anabolism, regulation of hydrogen peroxide metabolism, defense response by callose deposition, and response to red or far-red light. Studies of related genes in other species link the family to drought tolerance, salt tolerance, pre-harvest sprouting, and ABA accumulation under stress.