Journal
SCIENCE
Volume 319, Issue 5867, Pages 1241-1244Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1152505
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Funding
- Biotechnology and Biological Sciences Research Council [BBS/B/04498] Funding Source: Medline
- Biotechnology and Biological Sciences Research Council [BBS/B/04498] Funding Source: researchfish
- Natural Environment Research Council [NE/C510732/1] Funding Source: researchfish
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The specification and maintenance of growth sites are tightly regulated during cell morphogenesis in all organisms. ROOT HAIR DEFECTIVE 2 reduced nicotinamide adenine dinucleotide phosphate ( RHD2 NADPH) oxidase - derived reactive oxygen species ( ROS) stimulate a Ca2+ influx into the cytoplasm that is required for root hair growth in Arabidopsis thaliana. We found that Ca2+, in turn, activated the RHD2 NADPH oxidase to produce ROS at the growing point in the root hair. Together, these components could establish a means of positive feedback regulation that maintains an active growth site in expanding root hair cells. Because the location and stability of growth sites predict the ultimate form of a plant cell, our findings demonstrate how a positive feedback mechanism involving RHD2, ROS, and Ca2+ can determine cell shape.
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