Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: Integrating transcriptional controls for plant cell expansion. | Minireview Integrating transcriptional controls for plant cell expansion Keithanne Mockaitis and Mark Estelle Address Department of Biology 150 Myers Hall 915 East 3rd St. Indiana University Bloomington IN 47405 USA. Correspondence Mark Estelle. E-mail maestell@ Published 28 October 2004 Genome Biology 2004 5 245 The electronic version of this article is the complete one and can be found online at http 2004 5 11 245 2004 BioMed Central Ltd Abstract The plant hormones auxin and brassinosteroid promote cell expansion by regulating gene expression. In addition to independent transcriptional responses generated by the two signals recent microarray analyses indicate that auxin and brassinosteroid also coordinate the expression of a set of shared target genes. Control of plant cell expansion by auxin and brassinosteroid Young plants grow upward from the ground bend towards light when necessary and alter their growth in other ways to optimize the resources around them. Their rapid growth and tropic responses depend upon the perception of environmental signals in conjunction with endogenous hormones that control the elongation of cells. The small indolic hormone auxin promotes many plant growth processes including cell expansion during elongation of the seedling stem or hypocotyl. Steroid hormones called brassinosteroids have similar effects on some of the same physiological processes including hypocotyl elongation. Although some studies have suggested that the two hormones regulate the expression of a small number of genes in common 1 the upstream components of the auxin and brassinosteroid signaling pathways appear to be entirely distinct 2 3 . Recently nearly genome-wide studies of gene expression have expanded our knowledge of interactions between auxin and brassinosteroid pathways 4 5 . The results of these studies suggest that the response pathways of the two hormones regulate the expression of independent sets of genes and also .
