| Abstract Detail
Mineral Nutrition Schachtman, Daniel P. [1], Shin, Ryoung [2], Huppert, Kari A. [2], Jung, Jiyul [2], Kim, Min Jung [2]. Molecular adaptations to potassium deficiency. Potassium (K) is an essential nutrient required by plants in large quantities, but changes in soil concentrations may limit K acquisition by roots. It is not well understood how plant root cells respond to K deficiency. Our previous work identified reactive oxygen species as a component of root response to K deprivation as well as nitrogen and phosphorus deprivation (Shin and Schachtman, 2004; Shin et al., 2005; Schachtman and Shin, 2006). More recent work has focused on two genes that are downregulated in response to potassium deprivation. The downregulation of genes is an important strategy for adaptation to low nutrient conditions that allows plants to reduce growth and overall metabolic activity. The reduction in metabolic activity may allow plants to survive until nutrients become available. The characterization of two genes, that are downregulated upon potassium deprivation, encoding a kinase and a transcription factor will be described. The characterization of the transcription factor revealed the involvement of auxin regulated gene expression in the reduction of lateral root growth. Identification of the kinase targets showed a connection to growth via the regulation of metabolic processes. Schachtman DP, Shin R (2007) Nutrient Sensing and Signaling: NPKS. Annu Rev Plant Biol Shin R, Berg RH, Schachtman DP (2005) Reactive oxygen species and root hairs in Arabidopsis root response to nitrogen, phosphorus and potassium deficiency. Plant Cell Physiol 46: 1350-1357 Shin R, Schachtman DP (2004) Hydrogen peroxide mediates plant root response to nutrient deprivation. Proc Natl Acad Sci U S A 101: 8827-8832 Log in to add this item to your schedule
1 - Donald Danforth Plant Science Center, 975 N. Warson Rd, St. Louis, MO, 63132, USA 2 - Donald Danforth Plant Science Center
Keywords: Mineral nutrition growth potassium auxin kinase.
Presentation Type: Plant Biology Abstract Session: P Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton Date: Sunday, July 8th, 2007 Time: 8:00 AM Number: P11002 Abstract ID:226 |