Study On The Biological Effects In Horticultural Plants And Molecular Resistance Mechanism Induced By HarpinEcc Protein

hrp genes appear to be universal among many gram negative plant pathogens. The harpins protein coded by hrp is the main factor to elicit in non-host plants or in host plants with race specific resistance a rapid defense associated programmed cell death which usually manifests itself as hypersensitive response (HR). Harpin protein from Erwinia amylovora is the first well characterized elicitor of the HR and hrpN gene is first cloned and over-expression in recombined E. coli. HarpinEa can elicit HR in non-host plants, it has been found to elicit disease resistance response, insect resistance and stimulate the growth of plants, and so on. The mechanism of HarpinEa involving biological effects has been also well studied. Although harpins derived from different species share the similar biological effects, but the biological activity is obviously different. So, To clone hrp genes from different species lived in different environment and study the relationship between their structure-function has remarkable value for understanding the plant-pathogen reaction and development novel pesticides.Erwinia carotovora subsp. Carotovora (Ecc) and Erwinia chrysanthemi (Ech) are pathogens of Soft rots, which cause serious problem to horticulture plants such as vegetables and flowers etc. all over the world. hrp Gene Clusters have been discovered...