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Plant and Cell Physiology, 1984, Vol. 25, No. 6 875-882
© 1984

Article

Relationship of Nuclear Magnetic Resonance Relaxation Time to Water Content and Cold Hardiness in Flower Buds of Evergreen Azalea

Shosuke Kaku1, Mari Iwaya-Inoue1 and Lawrence V. Gusta2

1Biological Laboratory, College of General Education, Kyushu University Ropponmatsu, Fukuoka 810, Japan
2Crop Development Centre, University of Saskatchewan Saskatoon, Saskatchewan, Canada, S7N 0W0

The longitudinal relaxation time (T1) of water protons in florets of R. × akebono flower buds was measured with a pulse NMR spectrometer to determine the relationship of T1 to water content and cold hardiness (supercooling ability). Seasonal changes of T1 in florets were closely correlated with water content and supercooling ability of florets. T1 of florets was short for acclimated buds having a low water content and long for non-acclimated buds having a high water content. Flower buds collected in November and stored at 0 and 5°C for 4 weeks had shorter T1 values than buds stored at 10°C even though the floret water content and supercooling ability were similar. Thus, the short T1 of cold acclimated buds hardened naturally or by storage at low temperatures is due to a combination of both reduced water content and temperature.

(Received August 27, 1983; Accepted May 26, 1984)
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