The Serine Threonine protein kinase Long Primary Root (LPR) mediates ethylene regulation of plant root growth in Arabidopsis
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AbstractRoots are important organs for plants to absorb water and nutrients from soil. Growth and development of plant roots are modulated by environment factors and internal hormone cues. However, how these factors coordinate to regulate plant root growth and development remains largely unknown. From a recent phosphoproteomic study, we identified a previously uncharacterized protein kinase, which we named Long Primary Root (LPR), with significant phosphorylation state changes under nitrogen starvation and recovery conditions. LPR contains a eukaryotic Serine/Threonine kinase domain at its N-terminus. Loss of LPR function by T-DNA insertion resulted in increased primary root growth whereas over-expression of LPR led to reduced root growth compared to the wild type. Furthermore, the lpr mutant had lowered sensitivity to ACC, a direct precursor of the plant hormone ethylene, reduced root hair formation, but expanded elongation zone of roots. These results suggest that LPR may mediate ethylene-regulated plant root growth under nitrogen-limiting conditions. From a LPR-based yeast two-hybrid screen, several LPR-interacting proteins were identified, which include the ethylene receptor ETR1 and Constitutive Triple Response 1 (CTR1), further supporting LPR’s role in ethylene-regulated plant root growth in response to nitrogen. In the future, we will study how LPR interacts with these proteins to mediate nitrogen- and ethylene-regulated plant root growth.
All Author(s) ListWei YANG, Junxian HE
Name of ConferenceThe 22nd International Conference on Plant Growth Substances
Start Date of Conference21/06/2016
End Date of Conference25/06/2016
Place of ConferenceToronto
Country/Region of ConferenceCanada
LanguagesEnglish-United States

Last updated on 2018-22-01 at 21:23