Ljung, Karin
- Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet
Sammanfattning
Growth of a complex multicellular organism requires coordinated changes in diverse cell types. These cellular changes generate organs of the correct size, shape, and functionality. In plants, the growth hormone auxin induces stem elongation in response to shade; however, which cell types of the stem perceive the auxin signal and contribute to organ growth is poorly understood. Here, we blocked the transcriptional response to auxin within specific tissues to show that auxin signaling is required in many cell types for correct hypocotyl growth in shade, with a key role for the epidermis. Combining genetic manipulations in Arabidopsis thaliana with transcriptional profiling of the hypocotyl epidermis from Brassica rapa, we show that auxin acts in the epidermis in part by inducing activity of the locally acting, growth-promoting brassinosteroid pathway. Our findings clarify cell-specific auxin function in the hypocotyl and highlight the complexity of cell type interactions within a growing organ.
Nyckelord
auxin; brassinosteroid; epidermis; shade avoidance; stem growth
Publicerad i
Genes and Development
2016, volym: 30, nummer: 13, sidor: 1529-1541
Utgivare: COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
SLU författare
UKÄ forskningsämne
Utvecklingsbiologi
Publikationens identifierare
- DOI: https://doi.org/10.1101/gad.283234.116
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/79236