How do plants modulate their nutrient resources during stress and development?

All organisms need energy to survive. Plants are fortunate since they can produce their own energy through photosynthesis. However, under stress conditions, in which photosynthesis cannot operate and during the development of non-photosynthetic tissues, other resources must be found in order to meet the plant's energy demands. This problem is further compounded by the plant's inability to move, rendering the plant itself the sole energy source. 

We are interested in learning how plants degrade cellular components to supply the plant with nutrients during stress and development, using molecular and metabolic techniques.