Difficult question ! The mechanisms might also differ according the cell death inducers (pathogen ?)? I suggest you to read recent reviews on the topic:
- Autophagy as initiator or executioner of cell death (Minina et al., Trends Plant Sci. 2014 )
- Go in for the kill: How plants deploy effector-triggered immunity to combat pathogens (Wu et al. Virulence 2014)
- When supply does not meet demand-ER stress and plant programmed cell death (Williams et al., Front Plant Sci. 2014). This review discusses the features of cell death that are associated with ER stress in mammals also found in plants.
- Endoplasmic reticulum stress-induced PCD and caspase-like activities involved (Cai et al, Front Plant Sci. 2014). This review complements the previous one and introduce the importance of capases-like activities.
- If you are interested by the involvement of reactive oxygen species and nitric oxide in that process, I suggest you to take a look on the following paper: Cross-talk of nitric oxide and reactive oxygen species in plant programed cell death (Wang et al. Front Plant Sci 2013).
These 5 reviews will give you a first overview of the topic. You will find many other informative papers on Pub Med. Please find also 2 papers from my team in which we investigated the NO/ROS cross-talks and role of histone deacetylase in the control of cell death in plant immunity.
The question involves a great range of proteins and genes. Reviews of great interest are:
Van Doorn WG, Beers EP, Dangl JL, Franklin-Tong VE, Gallois P, Hara-Nishimura I, Jones AM, Kawai-Yamada M, Lam E, Mundy J (2011). Morphological classification of plant cell deaths. Cell Death Differ 18, 1241-1246.
Vanden Berghe T, Linkermann A, Jouan-Lanhouet S, Walczak H, Vandenabeele P (2014) Regulated necrosis: the expanding network of non-apoptotic cell death pathways. Nature Rev Mol Cell Biol 15: 135-147
Vanlerberghe GC (2013) Alternative oxidase: a mitochondrial respiratory pathway to maintain metabolic and signaling homeostasis during abiotic and biotic stress in plants. Int J Mol Sci 14:6805–6847
A recent review of our lab (Del Duca et al 2014, Front Plant Sci , DOI 103389/fpls.2014.00120), even though devoted to analyze the possible role of polyamines and proteins in PCD, can be useful as it describes 5 models of plant PCD and more general references are cited therein related to proteins as enzymes or substrates.