Figure 5
A working model of mechanisms involved in KS4202’s tolerance to the soybean aphid. Expression of tolerance in KS4202 is well defined during the V3 stage (fully developed leaf at third node83). High basal levels of ABA, JA, JA-Ile and defense-related lipoxygenases (LOX) contribute to susceptibility to aphid colonization and tolerance to aphid feeding-induced damage. The participation of ethylene (ET) warrants further research. Early aphid feeding induces SA and suppresses ABA. Over time with increasing aphid pressure, peroxidases become induced for the detoxification of accumulating ROS. Concurrently to peroxidases, PR1, and a transcription factor (WRKY60), are also induced by aphid feeding. Kait Chapman prepared the soybean illustration and we thank Ellis Johnson for the aphid illustration.
