The Journal of Horticultural Science & Biotechnology
Vol. 79 No: 2
Heat tolerance in English ivy as measured by an electrolyte leakage technique
D.M. YEH and P.Y. HSU
Identification of heat-tolerant English ivy (Hedera helix L.) genotypes for commercial production in hot areas is desirable.The extent to which electrolyte leakage from English ivy leaf discs, measured using a test for cell membrane thermostability (CMT), could be related to the reduction to shoot dry weight induced by heat in the greenhouse grown plants was determined. A curved relationship existed between the relative injury (RI) value occurring in leaf tissue discs of English ivy cultivars and treatment temperature. A single temperature treatment at 50°C resulted in injury values near the midpoint of the response curve and showed the greatest sensitivity in detecting genotypic differences in heat tolerance.The cultivars with a high RI value are those with the lesser CMT and more reduction in shoot dry weights by high day/night temperature at 35/30°C.
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