Study of cis-cinnamic acid in Arabidopsis thaliana.
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.
Wong
Wai Shing
WS
Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Guo
Di
D
Wang
Xiao Li
XL
Yin
Zhi Qi
ZQ
Xia
Bing
B
Li
Ning
N
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
D002934:Cinnamates; D017931:DNA Primers; C029010:cinnamic acid