Photosynthetic damage caused by grapevine rust (Phakopsora euvitis) in Vitis vinifera and Vitis labrusca

Autor(es)

Navarro, B. L. ^[1] ; Nogueira Junior, A. F. ^[1] ; Ribeiro, R. V. ^[2] ; Sposito, M. B. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, ESALQ, Dept Plant Pathol, Piracicaba - Brazil

^[2] Univ Estadual Campinas, Inst Biol, Dept Plant Biol, Campinas, SP - Brazil

^[3] Univ Sao Paulo, ESALQ, Dept Crop Sci, Plant Pathol, Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AUSTRALASIAN PLANT PATHOLOGY; v. 48, n. 5, p. 509-518, SEP 2019.
• Citações Web of Science: 0

Resumo

Grapevine rust Phakopsora euvitis is an important disease in tropical and subtropical grapevine-producing areas, and both American (Vitis labrusca) and European (Vitis vinifera) grapevine species are sensitive to rust. Grapevine rust can cause early plant defoliation, reducing photosynthesis and photoassimilate supply and storage. This study evaluated the photosynthetic damage induced by varying grapevine rust intensities in leaves of V. vinifera cv. Moscato Giallo and V. labrusca cv. Niagara Rosada. The disease effect in tissues adjacent to the lesion, called virtual lesion (beta), was estimated for photosynthetic variables, considering measurements taken in both healthy and diseased tissues. The average lesion size was higher in V. vinifera (0.66 mm(2)) than in V. labrusca (0.24 mm(2)). A water-soaked halo around the lesion was observed only in V. vinifera. The beta-values estimated for the photosynthetic rate were 4.99 for V. labrusca and 5.93 for V. vinifera, taking into account the water-soaked and sporulating areas. When considering only the sporulating area, the beta-value increased to 11.49 in V. vinifera. Grapevine rust had similar negative effects on photosynthesis in both species with increasing disease severity. While stomatal conductance was slightly affected, the pathogen caused significant reductions in the effective quantum efficiency of photosystem II and the instantaneous carboxylation efficiency of V. vinifera and V. labrusca with increasing disease severity. The beta-value of instantaneous carboxylation efficiency was higher in V. vinifera (9.26) than in V. labrusca (4.76). In conclusion, Phakopsora euvitis dramatically affects photosynthesis in both V. vinifera cv. Moscato Giallo and V. labrusca cv. Niagara Rosada, causing large virtual lesions and substantial damage to the photochemical and biochemical reactions associated with CO2 assimilation. (AU)

• Processo FAPESP: 17/02432-6 - Modelo de simulação de danos causados por míldio e ferrugem em Vitis spp. sob diferentes sistemas de condução
• Beneficiário: Antonio Fernandes Nogueira Júnior
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/24003-9 - Epidemiologia, avaliação de danos e controle de doenças da videira
• Beneficiário: Lilian Amorim
• Modalidade de apoio: Auxílio à Pesquisa - Temático