Microspectroscopic Imaging of Nodulation Factor-binding Sites on Living Vicia Sativa Roots Using a Novel Bioactive Fluorescent Nodulation Factor

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 1997 May 1

PMID 9129802

Citations 4

Authors

T W Gadella Jr

G Vereb Jr

A. E. Hadri

H Rohrig

J Schmidt

M John

J Schell

T Bisseling

Affiliations

Soon will be listed here.

Abstract

A novel bioactive fluorescent nodulation (Nod) factor, NodRlv-IV(BODIPY FL-C16), has been synthesized by attaching a BODIPY FL-C16 acyl chain to the primary amino group of chitotetraose deacetylated at the nonreducing terminus by recombinant NodB. The binding of the fluorescent Nod factor to root systems of Vicia sativa was investigated with fluorescence spectral imaging microscopy (FSPIM) and fluorescence ratio imaging microscopy (FRIM). Spatially resolved fluorescence spectra of living and labeled Vicia sativa root systems were measured by FSPIM. Strong autofluorescence, inherent to many plant systems when excited at 488 nm, was corrected for by utilizing the difference in fluorescence emission spectra of the autofluorescence and NodRlv-IV(BODIPY FL-C16). A methodology is presented to break down the in situ fluorescence emission spectra into spatially resolved autofluorescence and BODIPY FL fluorescence spectra. Furthermore, an FRIM method was developed for correcting autofluorescence in fluorescence micrographs for this system. After autofluorescence correction it was shown that NodRlv-IV(BODIPY FL-C16) was concentrated in the root hairs, but was also bound to other parts of the root surface.

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