title: Study of cis-cinnamic acid in Arabidopsis thaliana.
abstract: Trans-cinnamic acid (CA) can be isomerized to cis-CA in Arabidopsis thaliana extract under sunlight. Piperonylic acid treatment of Arabidopsis under ultraviolet (UV) light increased the level of cis-CA in these treated tissues. Similarly, cis-CA was also detected from Oryza sativa seedlings grown under sunlight. These results suggest that cis-CA may occur in planta. Application of cis-CA to seedlings of both wild type Arabidopsis and auxin-insensitive mutants, aux1 and axr2, resulted in nearly identical dose response curves in root growth, indicating that the mode of action by which cis-CA affects plant growth is different from that of auxins. According to root growth inhibition assay, cis-CA is nearly 10 times more active than trans-CA. These results suggest that cis-CA is a unique plant growth regulator but its in vivo function remains to be elucidated.
authors.affiliation: Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors.forename: Wai Shing
authors.initials: WS
authors.lastname: Wong
authors.forename: Di
authors.initials: D
authors.lastname: Guo
authors.forename: Xiao Li
authors.initials: XL
authors.lastname: Wang
authors.forename: Zhi Qi
authors.initials: ZQ
authors.lastname: Yin
authors.forename: Bing
authors.initials: B
authors.lastname: Xia
authors.forename: Ning
authors.initials: N
authors.lastname: Li
mesh_terms: D017360:Arabidopsis / Q000254:growth & development / Q000378:metabolism*; D001483:Base Sequence; D002934:Cinnamates / Q000378:metabolism*; D017931:DNA Primers; D018517:Plant Roots / Q000254:growth & development / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D002934:Cinnamates; D017931:DNA Primers; C029010:cinnamic acid