Changes in Aphid-Plant Interactions under Increased Temperature.

Area of Science:

• Environmental Science
• Zoology
• Plant Science

Background:

• Thermal stress disrupts the balance of reactive oxygen species (ROS) in organisms.
• Understanding aphid-host plant interactions under changing temperatures is crucial for ecological studies.

Purpose of the Study:

• To investigate the effects of increased temperature on the aphid-host plant interaction.
• To analyze changes in aphid development and enzymatic defense mechanisms at different temperatures.

Main Methods:

• Experiments were conducted at constant temperatures: 20°C, 25°C, and 28°C.
• Aphid (Macrosiphum rosae) development, reproduction, and longevity were assessed.
• Enzymatic markers (SOD, CAT, GST, β-glucosidase, PPO, POD) in aphids and host plants were analyzed.

Main Results:

• Higher temperatures (28°C) reduced aphid reproduction and lifespan, decreasing fecundity.
• Aphids exhibited a two-stage defensive response to thermal stress, with heightened activity at 28°C.
• Host plants displayed more effective enzymatic defense at 20°C, showing peak enzyme activity.

Conclusions:

• Temperature significantly influences aphid biology and their interaction with host plants.
• Aphid defense mechanisms are temperature-dependent, increasing under thermal stress.
• Host plant defense efficacy against combined abiotic and biotic stress is optimized at cooler temperatures.