SIS7 — Brassica napus

Summary

BnSIS7 (also known as NCED3, STO1) on chromosome C03 encodes a carotenoid dioxygenase with 9-cis-epoxycarotenoid dioxygenase activity and metal binding, belonging to the Carotenoid_Oase family. The gene is associated with carotenoid, carotene, and lycopene metabolism, abscisic acid biosynthesis, and responses to water, drought, salt, osmotic, cold, and temperature stress. It is linked to traits including photosynthetic rate, stomatal resistance, leaf water potential, chlorophyll, carotenoid, proline, sucrose, and starch content, as well as seed dormancy, flower and petal color, and phosphorus and sodium content. Localized to the chloroplast thylakoid membrane and stroma, BnSIS7 is also associated with phloem loading, sucrose transport, sulfate assimilation, glutathione anabolism, petal formation, abscission, and memory. Studies of related genes in other species link the family to drought tolerance, ABA accumulation, transpiration rate, and boron toxicity tolerance.