SIS7 — Brassica napus

Summary

BnSIS7 (also known as BnNCED3, BnSTO1) on chromosome A05 of oilseed rape encodes a carotenoid oxygenase with 9-cis-epoxycarotenoid dioxygenase activity. The gene is associated with abscisic acid biosynthesis, accumulation and production, as well as responses to drought, salt, osmotic, cold and temperature stress. It has been connected to stomatal closure, seed dormancy, germination under osmotic stress, and sugar sensitivity. Additional associations include leaf temperature, photosynthetic rate, chlorophyll content, sucrose, proline and starch content, phloem loading and sucrose transport, ethylene sensitivity, abscission, and metabolic burst. The product localises to the chloroplast thylakoid membrane and stroma. Studies of related genes in other species link the family to drought tolerance, ABA accumulation under drought, transpiration rate, dehydration response, lateral root development and epoxycarotenoid cleavage.