Pseudomonas syringae pv. syringae harpinPss: a protein that is secreted via the Hrp pathway and elicits the hypersensitive response in plants

Article Abstract:

An in situ lysis process was designed to identify the Pseudomonas syringae 61 hypersensitive response (HR) elicitor, and to examine an expression library of P.s. syringae 61 hrp genes for HR activity. The hypersensitive response (HR) of higher plants needs HrpH, indicating that even the P.s. syringae 61 HR elicitor is a secreted protein that is more elusive than the Erwinia amylovosa hairpin, but different in its primary structure. The hypersensitive neurosis in higher plants is caused by hairpin pss, a 34.7 kd extracellular protein encoded by the P. syringae pv. syringae 61 hrpZ gene.

Analysis, Genetic aspects, Pseudomonas syringae, Host-parasite relationships

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Plant stomata function in innate immunity against bacterial invasion

Article Abstract:

Microbes entering into host tissue through small surface openings initially cause infection in animals and plants and the stomata in plant are traditionally considered as one such point of entry. However, evidence to the contrary is provided that shows that the stomata are part of an integral innate immune system and act as a barrier against bacterial infection.

Immune system, Host plants

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Plant pathogens trick guard cells into opening the gates

Article Abstract:

Gas exchange and water transpiration in plants in response to changing environmental conditions is regulated by plant stomata that have an important role in host defense. A study demonstrates that when the stomata detect potential microbial pathogens they close in order to prevent leaf interior infection.

Research and Development in the Physical, Engineering, and Life Sciences, Botany, Environmental aspects, Plant-pathogen relationships

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