Damage on grapevine cv. Niagara Rosada leaves caused by the combined effect of temperature and Asian grapevine leaf rust (Neophysopella tropicalis)

Author(s)

Rasera, Julia B. ; Appezzato-da-Gloria, Beatriz ; Ribeiro, Rafael V. ; Nogueira-Junior, Antonio F. ; Amorim, Lilian

• Document type: Journal article
• Source: PLANT PATHOLOGY; v. 72, n. 8, p. 10-pg., 2023-06-03.

Abstract

Asian grapevine leaf rust (AGLR), caused by Neophysopella tropicalis, is a problem for viticulture, especially in latitudes lower than 25 degrees S, which include the most significant production regions in Brazil. Climate change has raised new concerns in agriculture as temperature can affect the resistance of plants to pathogens. With the aim of understanding how air temperature rise affects the AGLR pathosystem, measurements of leaf gas exchange and epidemiological and histopathological analyses were carried out on control and inoculated leaves of Vitis labrusca 'Niagara Rosada' grown at 25 degrees C and 30 degrees C. The lesion density and rust severity were higher at 25 degrees C than 30 degrees C, and the ratio between adaxial surface necrosis and the abaxial surface area occupied by pustules was >1 only at 30 degrees C, presenting a necrosis not associated to the pathogen lesion. In fact, leaf necrosis was identified on control plants kept at 30 degrees C and associated with gerontoplasts, representing accelerated leaf senescence. The AGLR pathogen reduced gas exchange and photosystem II activities at 25 degrees C, with no difference between control and inoculated plants at 30 degrees C. Our results indicate that AGLR is sensitive to increasing air temperature. However, the accelerated leaf senescence caused by the combination of N. tropicalis infection and temperature on Niagara Rosada can lead to high leaf damage. (AU)

• FAPESP's process: 19/15191-2 - Can the stress caused by temperature affect the grapevine rust pathosystem? Epidemiologic, physiological and histopathological analyses in Vitis labrusca 'Niagara Rosada' and V. vinifera 'Cabernet'
• Grantee: Júlia Boscariol Rasera
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 19/13191-5 - Epidemiological components, damage characterization and control of tropical and temperate rusts at a global climate change scenario
• Grantee: Marcel Bellato Spósito
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/24003-9 - Grape diseases: epidemiology, damage assessment and control
• Grantee: Lilian Amorim
• Support Opportunities: Research Projects - Thematic Grants