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Plant and Cell Physiology, 1986, Vol. 27, No. 3 515-521
© 1986

Article

Cold Hardiness and Acclimation Intensity in Flower Buds for Fall Bloom and Spring Bloom Clones in Rhododendron kiusianum, a Dwarf Evergreen Azalea

Mari Iwaya-Inoue and Shosuke Kaku

Biological Laboratory, College of General Education, Kyushu University Ropponmatsu, Fukuoka 810, Japan

The relationship between the degree of cold hardiness (supercooling ability of florets) and the acclimation intensity in flower buds was investigated in the fall bloom and the spring bloom (typical) clones of Rhododendron kiusianum, a hardy dwarf evergreen azalea. Supercooling ability or exotherm temperature distribution (ETD) in florets was determined by differential thermal analysis (DTA) and the intensity of bud acclimation or the rate of deacclimation was judged by the changes in ETD profiles resulting from the dehardening temperature treatment. Although the two clone types showed no significant differences in ETDs and water contents in florets, they differed in their rates of bud deacclimation. The flower buds of fall bloom clones generally tend to deacclimate more quickly than the spring bloom ones throughout the seasons. It is concluded that the degree of cold hardiness in flower buds of R. kiusianum does not differ between the fall bloom and spring bloom clones but the intensity of bud acclimation does; acclimation intensity is higher in the spring bloom clones and the rate of deacclimation is greater in the fall bloom ones.

(Received October 14, 1985; Accepted February 5, 1986)
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