A Nuclear Magnetic Resonance Study of Water in Cold-acclimating Cereals 1
AUTOR(ES)
Gusta, Lawrence V.
RESUMO
Continuous wave nuclear magnetic resonance (NMR) studies indicated that the line width of the water absorption peak (Δv½) from crowns of winter and spring wheat (Triticum aestivum L.) increased during cold acclimation. There was a negative correlation between Δv½ and crown water content, and both of these parameters were correlated with the lowest survival temperature at which 50% or more of the crowns were not killed by freezing (LT50). Regression analyses indicated that Δv½ and water content account for similar variability in LT50. Slow dehydration of unacclimated winter wheat crowns by artificial means resulted in similarly correlated changes in water content and Δv½. Rapid dehydration of unacclimated crowns reduced water content but did not influence Δv½. The incubation of unacclimated winter wheat crowns in a sucrose medium reduced water content and increased Δv½. The increase in Δv½ appears to be dependent in part on a reduction in water content and an increase in solutes.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=542885Documentos Relacionados
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