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Improving tolerance to heat stress is a major challenge in many
crops, especially C3 crops, given the threat of recent global
warming. While significant achievements have been made on
understanding the molecular and physiological mechanisms to
short-term exposure to high temperature, the physiological
mechanisms of summer tolerance in fields, which are characterized
by prolonged exposure to high temperature stress, are not still
well understood. In this study, six experiments were conducted to
clarify the physiological mechanisms of tolerance to high
temperature stress by comparing between genotypes, populations and
different species including C3 and C4 photosynthetic types.
Overall, although the complexity of heat tolerance was revealed by
the involvement of various mechanisms such as suppression of ROS,
scavenging of toxic ROS, and leaf functions, this study
definitively showed that the oxidative stress resulting from the
excessive production of ROS is the main cause of damages under heat
stress.
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