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Occurrence of guava rust in a scenario of temperature increase and water deficit imposed by global climate change

Grant number: 22/02460-8
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): August 01, 2022
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Lilian Amorim
Grantee:Manoel Penachio Gonçalves
Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Associated research grant:19/13191-5 - Epidemiological components, damage characterization and control of tropical and temperate rusts at a global climate change scenario, AP.TEM
Associated scholarship(s):23/15788-4 - Process-based modelling to predict the effects of climate change on myrtle rust, BE.EP.DR


The impacts of global climate change represent one of the greatest challenges facing humanity nowadays. Future scenarios projected by the Intergovernmental Panel on Climate Change (IPCC) threaten biodiversity and food production globally. Climate change impact on crop production has been the focus of many recent studies. The State of São Paulo is the largest Brazilian producer of guava, responsible for 37% of the national production, which is strongly challenged by abiotic factors, such as temperature and rainfall. Myrtle rust, caused by Austropuccinia psidii, is another limiting factor for guava production, causing a significant reduction in fruit production when chemical control is not performed. Although the effect of abiotic stresses on plant development has been extensively studied, few studies have focused on the interaction between abiotic and biotic stresses. The main objective of this research project is to evaluate the guava rust progress under high temperature and water deficit, environmental conditions that have become increasingly frequent in future scenarios, in order to analyze the risk of disease occurrence in current and future climate scenarios. The monocyclic components, photosynthetic damage and morpho-anatomical changes caused by myrtle rust will be evaluated in 'Paluma' guava plants exposed or not to abiotic stresses, such as high temperature and moderate water deficit, individually and in combination. The results about the guava rust progress under different environmental conditions, obtained in this study, together with information on the epidemiology of the disease already available in the literature, will be used to predict the risk of disease occurrence in upcoming climate change scenarios.

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