Thermostability of Cell Membranes as a Measure of Heat Tolerance and Relationship to Flowering Delay in Chrysanthemum

in Journal of the American Society for Horticultural Science
Authors: D.M. Yeh1 and H.F. Lin1
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  • 1 Department of Horticulture, National Taiwan University, Taipei, Taiwan, ROC

Identification of heat-tolerant chrysanthemum [Dendranthema ×grandifolia (Ramat.) Kitamura] genotypes for commercial production in hot areas of the world is desirable. The extent to which electrolyte leakage from chrysanthemum leaf discs, measured using a test for cell membrane thermostability (CMT), could be related to the delay in flowering induced by heat in the field-grown plants was determined. The relationship between the relative injury (RI) occurring in leaf tissue discs of chrysanthemum cultivars and treatment temperature was sigmoidal. A single temperature treatment at 50 °C resulted in injury values near the midpoint of the sigmoidal response curve and showed the greatest sensitivity in detecting genotypic differences in heat tolerance. The cultivars with a low RI value are those with the greater CMT and shorter heat-induced delay to flowering.

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