Pulsed EPR spin-probe study of intracellular glasses in seed and pollen.
J Magn Reson
; 142(2): 364-8, 2000 Feb.
Article
em En
| MEDLINE
| ID: mdl-10648155
ABSTRACT
EPR spectra of 3-carboxy-proxyl (CP) in dry biological tissues exhibited a temperature-dependent change in the principal value A'(zz) of the hyperfine interaction tensor. The A'(zz) value changed sharply at a particular temperature that was dependent on water content. At elevated water contents, the break occurred at lower temperatures and appeared to be associated with the melting of the cytoplasmic glassy state. To investigate the reason for the change in A'(zz), we employed echo-detected EPR (ED EPR) spectroscopy. The shape of the ED EPR spectrum revealed the presence of librational motion of the spin probe, a motion typically present in glassy materials. The similarities in temperature dependency of A'(zz) and librational motion of CP in pea seed axes indicated that the change in A'(zz) arose from librational motion. ED EPR measurements of CP as a function of water content in Typha latifolia pollen showed that librational motion decreased with decreasing water contents until a plateau or minimum was reached. ED EPR spectroscopy is a valuable technique for characterizing the relation between molecular motion and storage kinetics of dry seed and pollen.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pólen
/
Sementes
/
Espectroscopia de Ressonância de Spin Eletrônica
Idioma:
En
Revista:
J Magn Reson
Ano de publicação:
2000
Tipo de documento:
Article