Here we have most convincing proof of the stimulation of protoplasm by other protoplasm in direct contact with it; and that the metabolism of the host-cells is profoundly altered is shown not only by the abnormal growth of the cells, but also by the starvation of the rest of the turnip plant as the plasmodiophora gets the upper hand.
"Disease in Plants"
H. Marshall Ward
But we must further assume that the same is also true of the invading protoplasm, and that the plasmodiophora is also supplied with suitable atom-complexes to build up its protoplasm molecules, as fast as they are shattered and the rejecta burnt off in respiration.
"Disease in Plants"
H. Marshall Ward