Figure 9.

Proposed model of the regulatory function of TOR in response to low N stress in M. hupehensis. Under low N stress, TOR affects various physiological processes in M. hupehensis plants, such as photosynthesis and N, starch, and anthocyanin metabolism. This phenotypic variation is related to crosstalk between TOR and its downstream components. It negatively regulates JA and autophagy in plants to confer low N stress tolerance; TOR inhibition also cooperates with SA to cause programmed cell death in M. hupehensis.