When a plant senses an invading pathogen, it activates a molecular signaling cascade that switch on its defense mechanisms. One such mechanism involves sacrificing host cells to the pathogen. This is a tightly controlled process that involves the work of plant proteins to ensure that the sacrificial cells are only killed if the pathogen is attacking. This process, called the cell death response, ensures that only a few host cells die.
Click here for original story, Discovery of a new protein gives insight into a long-standing plant immunity mystery
Source: Phys.org