[Membrane lipid peroxidation and hypersensitive reaction induced by a glycoprotein elicitor from Magnaporthe grisea in rice leaves].

With a series of four near-isogenic lines (NIL) of rice, studies were carried out in the interaction between rice and a specific glycoprotein elicitor from Magnaporthe grisea. After treatment with the elicitor, O(-.)(2) generation rate increased more remarkably on the leaves of incompatible interaction of rice, than compatible interaction of rice. Change in SOD activity and CAT activity was similar in leaves of rice with different resistance after inoculation with the elicitor. On the contrary, POD activity was positive relative to rice resistance. And changes in LOX activity were increased more remarkably and rapidly on the leaves of incompatibly interacting rice. These changes led to lipid peroxidation in the leaves of incompatibly interacting rice. Relative conductance rate and MDA content were also increased more remarkably and rapidly in leaves of incompatibly interacting rice. Our results also showed that elicitor could induce hypersensitive reaction (HR reaction) in leaves of completely or highly incompatible interacting rice, but not in the two NIL rice varieties (one with moderately incompatible interactions and another with compatible ones). The results suggest that lipid peroxidation and HR reaction in rice leaves induced by the elicitor may play an important role in the resistance of rice seedlings.