To our knowledge, evaluation of heat tolerance in calendula cultivars is firstly reported.
Temperature above 35 °C resulted in damage to growth and flowering of calendula.
The decreases of growth under heat stress were genotype-dependent in calendula.
The cultivar ‘Indian Prince’ exhibited greater vegetative and reproductive tolerance to high temperature.
Cultivar ‘Zen’ had lower leaf electrolyte leakage and higher membrane stability.
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