Article: article from journal or magazin.
In vivo visualization of F-actin structures during the development of the moss Physcomitrella patens.
* The 'in planta' visualization of F-actin in all cells and in all developmental stages of a plant is a challenging problem. By using the soybean heat inducible Gmhsp17.3B promoter instead of a constitutive promoter, we have been able to label all cells in various developmental stages of the moss Physcomitrella patens, through a precise temperature tuning of the expression of green fluorescent protein (GFP)-talin. * A short moderate heat treatment was sufficient to induce proper labeling of the actin cytoskeleton and to allow the visualization of time-dependent organization of F-actin structures without impairment of cell viability. * In growing moss cells, dense converging arrays of F-actin structures were present at the growing tips of protonema cell, and at the localization of branching. Protonema and leaf cells contained a network of thick actin cables; during de-differentiation of leaf cells into new protonema filaments, the thick bundled actin network disappeared, and a new highly polarized F-actin network formed. * The controlled expression of GFP-talin through an inducible promoter improves significantly the 'in planta' imaging of actin.
Actins/chemistry, Actins/physiology, Bryopsida/cytology, Bryopsida/genetics, Green Fluorescent Proteins/genetics, Microfilaments/metabolism, Plant Proteins/genetics, Plants, Genetically Modified/genetics, Promoter Regions, Genetic, Recombinant Fusion Proteins/genetics, Soybeans/genetics, Talin/genetics
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