Journal
JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE
Volume 128, Issue 5, Pages 656-660Publisher
AMER SOC HORTICULTURAL SCIENCE
DOI: 10.21273/JASHS.128.5.0656
Keywords
Dendranthema x grandifolia; electrolyte leakage; flowering
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Identification of heat-tolerant chrysanthemum [Dendranthema xgrandifolia (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 degreesC 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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