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An effector protein of the wheat stripe rust fungus targets chloroplasts and suppresses chloroplast function
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An effector protein of the wheat stripe rust fungus targets chloroplasts and suppresses chloroplast function
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Journal Article
An effector protein of the wheat stripe rust fungus targets chloroplasts and suppresses chloroplast function
2019
Overview
Chloroplasts are important for photosynthesis and for plant immunity against microbial pathogens. Here we identify a haustorium-specific protein (Pst_12806) from the wheat stripe rust fungus,
Puccinia striiformis
f. sp.
tritici
(
Pst
), that is translocated into chloroplasts and affects chloroplast function. Transient expression of
Pst_12806
inhibits BAX-induced cell death in tobacco plants and reduces
Pseudomonas
-induced hypersensitive response in wheat. It suppresses plant basal immunity by reducing callose deposition and the expression of defense-related genes.
Pst_12806
is upregulated during infection, and its knockdown (by host-induced gene silencing) reduces
Pst
growth and development, likely due to increased ROS accumulation. Pst_12806 interacts with the C-terminal Rieske domain of the wheat TaISP protein (a putative component of the cytochrome b6-f complex). Expression of
Pst_12806
in plants reduces electron transport rate, photosynthesis, and production of chloroplast-derived ROS. Silencing
TaISP
by virus-induced gene silencing in a susceptible wheat cultivar reduces fungal growth and uredinium development, suggesting an increase in resistance against
Pst
infection.
Chloroplasts are important for plant immunity against microbial pathogens. Here Xu et al. identify, in the wheat stripe rust fungus, a haustorium-specific protein that is translocated into chloroplasts and affects chloroplast function by interacting with a putative component of the plant cytochrome b6-f complex.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 38/111
/ Disease Resistance - genetics
/ Disease Resistance - immunology
/ Fungal Proteins - immunology
/ Fungal Proteins - metabolism
/ Fungi
/ Gene Expression Regulation, Fungal - immunology
/ Host-Pathogen Interactions - genetics
/ Host-Pathogen Interactions - immunology
/ Humanities and Social Sciences
/ Immunity
/ Plant Diseases - microbiology
/ Proteins
/ Pseudomonas syringae - immunology
/ Pseudomonas syringae - physiology
/ Reactive Oxygen Species - immunology
/ Reactive Oxygen Species - metabolism
/ Science
/ Tobacco
/ Viruses
/ Wheat
