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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


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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

Canceled

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