Abstract
Background and aims In the field, high ambient temperature inevitably leads to high root zone temperature, especially for seedlings. It is reported that maintaining a non-stressful root temperature is beneficial to improving tolerance of shoot to heat stress. However, our recent studies found that 1-yearold seedlings of smooth-pit peach grew poorly at nonstressful root zone temperature under field conditions in summer. To explore the mechanisms underlying the observations, we studied the physiological responses of seedlings of smooth-pit peach (Prunus mira Koehne), a heat-sensitive species, to high ambient temperatures (37 and 42°C) under varying root zone
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