Journal
PLANT PHYSIOLOGY
Volume 158, Issue 3, Pages 1342-1358Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.111.190397
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Funding
- Ministerio de Ciencia e Innovacion of Spain [AGL2008-03177/AGR]
- Junta de Castilla y Leon, Spain [SA-134A08]
- Spanish Ministry of Science and Innovation through the Juan de la Cierva [JCI-2009-05364]
- Ramon y Cajal Program
- Formacion del Profesorado Universitario [AP2009-2656]
- Formacion de Personal Investigador [BES-2009-013920]
- Junta para la Ampliacion de Estudios predoctoral scholarship
- Consejo Superior de Investigaciones Cientificas
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Hemibiotrophic plant pathogens first establish a biotrophic interaction with the host plant and later switch to a destructive necrotrophic lifestyle. Studies of biotrophic pathogens have shown that they actively suppress plant defenses after an initial microbe-associated molecular pattern-triggered activation. In contrast, studies of the hemibiotrophs suggest that they do not suppress plant defenses during the biotrophic phase, indicating that while there are similarities between the biotrophic phase of hemibiotrophs and biotrophic pathogens, the two lifestyles are not analogous. We performed transcriptomic, histological, and biochemical studies of the early events during the infection of maize (Zea mays) with Colletotrichum graminicola, a model pathosystem for the study of hemibiotrophy. Time-course experiments revealed that mRNAs of several defense-related genes, reactive oxygen species, and antimicrobial compounds all begin to accumulate early in the infection process and continue to accumulate during the biotrophic stage. We also discovered the production of maize-derived vesicular bodies containing hydrogen peroxide targeting the fungal hyphae. We describe the fungal respiratory burst during host infection, paralleled by superoxide ion production in specific fungal cells during the transition from biotrophy to a necrotrophic lifestyle. We also identified several novel putative fungal effectors and studied their expression during anthracnose development in maize. Our results demonstrate a strong induction of defense mechanisms occurring in maize cells during C. graminicola infection, even during the biotrophic development of the pathogen. We hypothesize that the switch to necrotrophic growth enables the fungus to evade the effects of the plant immune system and allows for full fungal pathogenicity.
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