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Phytophthora capsici is a highly destructive pathogen of pepper. To examine   whether proline modifies the levels of plant defense compounds produced in   response to P. capsici-induced stress, pepper seedlings were infected with P.   capsici-22 in the presence of proline (1 mM, 10 mM) or in its absence.   Proline was sprayed on the leaves of CM-334 and Kekova pepper cultivars prior   to inoculation. CM-334 was more resistant to P. capsici-22, while the Kekova   cultivar exhibited a sensitive reaction. P. capsici-22 increased the total   phenolic compound and H2O2 levels, as well as phenylalanine ammonia-lyase,   polyphenol oxidase and peroxidase activities in pepper seedlings. The   application of exogenous proline further increased the activities of   phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase, as well as   the total levels of phenolic compounds and the fresh and dry weights of the   plants on the 5th and 7th days post treatment. After proline application, the   highest catalase activity was found in both cultivars on the 5th day of the   10 mM proline + P. capsici application. On all days of the experiment, the   applications caused a decrease in disease severity, necrosis length and H2O2   levels in both cultivars. In addition, proline decreased the colony growth of   P. capsici and the number of zoospores. This finding indicates that enzymes   and total phenolic compound levels protect the pepper seedlings against   stress-related damage. Moreover, proline has the potential to directly   scavenge free radicals and promote enzyme activity in pepper seedlings under   P. capsici stress. These results suggest that foliar application of proline   is an effective way to improve the stress tolerance of pepper to P. capsici

Alleviation of Phytophthora capsici-induced oxidatıve stress by foliarly applied proline in Capsicum annuum L.