GA5 — Lactuca sativa

Summary

LsGA5 (GA5, GA20OX2) on lettuce chromosome 7 encodes a gibberellin 20-oxidase, a 2-oxoglutarate-dependent dioxygenase. The gene is associated with gibberellin signaling and biosynthesis, and with responses to gibberellin, flooding, red or far-red light, and short-day flowering. It has been linked to the regulation of growth, leaf and flower development, and defense responses. Associations with plant height, stem height, biomass, leaf size, root growth, seed germination, flowering time, fruit set, parthenocarpy, fertility, and ethylene sensitivity have been reported. The gene is also connected to salt stress tolerance, wind tolerance, drought rhizogenesis, thermomorphogenic growth, and adaptation to high altitude. Studies of related genes in other species link the family to stem growth, fruit development, trichome formation, and salt tolerance.