The phenylpropanoid pathway, the source of a large array of compounds with diverse functions, starts with the synthesis of trans-cinnamic acid (t-CA) that is converted by cinnamate-4-hydroxylase (C4H) into p-coumaric acid. We have recently shown that in Arabidopsis, exogenous t-CA promotes leaf growth by increasing cell expansion and that this response requires auxin signaling. We have also shown that cell expansion is increased in C4H loss-of-function mutants. Here we provide further evidence that leaf growth is enhanced by either t-CA or a t-CA derivative that accumulates upstream of C4H. We also show that this growth response pathway has two components: one that requires auxin signaling and another which employs a currently unknown mechanism.
Digital Object Identifier (DOI)
This work was supported by the Kentucky Tobacco Research and Development Center; National Institute of Food and Agriculture [HATCH project 1009329].
Kurepa, Jasmina and Smalle, Jan A., "trans-Cinnamic Acid-Induced Leaf Expansion Involves an Auxin-Independent Component" (2019). Plant and Soil Sciences Faculty Publications. 141.