How does auxin act?
consider this abstract copied below…. Expression of auxin-regulated genes (F. Sitbon and C. Perrot-Rechenmann) Auxins constitute a small class of plant hormones having profound effects on plant development. Among the fastest cellular responses to auxin addition is an alteration of gene expression, and the abundance of several mRNA species has been shown to increase, or decrease, within minutes to hours after auxin treatment. The regulation of this process appears, at least partly, to be at the transcriptional level. Using differential screening approaches, a number of auxin-regulated cDNAs and genes have been isolated, mainly from elongating tissues and dividing cells. In addition, an influence of auxin on the regulation of genes isolated for other purposes has also been revealed. With respect to kinetic and dose-response characteristics, as well as to cellular expression and hormonal specificity, individual auxin-regulated genes seem to be regulated very differently, possibly reflec
