Plant cell elongation has been a topic without complete understanding. The exact model for cell elongation is believed to have a relationship to several hormones and proteins still under a variety of current studies. Indole-acetic acid, or Auxin, is a hormone found in plants that has been found to be involved in cell elongation.
Recent research on Arabidopsis thaliana showed a specific mutant “Echidna”(a protein involved in golgi transport) was found to be necessary for Auxin transport in the golgi apparatus to the plasma membrane within Arabidopsis cells. Boutte andJonsson et al. published in 2013 literature concerning apical hook development(a time between formation and maintenance phase in the development of Arabidopsis in which a bend occurs on hypocotyl) and Auxin’s relationship to it.
It was found that during development, the Echidna mutant was fou
nd to lose the apical hook bend during the maintenance phase as compared to the wild type which retains its bend during the maintenance phase. Through marking Auxin with YFP, fluorescence of the plants was severly decreased in the Echidna mutant, but not in the wild type. When comparing fluorescence of expression of another transport protein PIN3, it was found that the levels did not change in the Echidna nor wild type plants. Auxin is involved in a specific way with Echidna that is different from several other transporter proteins.As mentioned in the paper, the data that the researchers recovered showed that Auxin has a distinct role from other transport carriers with Echidna in its function of plant differential cell elongation.
Posted by Michael Dailing(A)