Physiological and biophysical alterations in maize plants caused by Colletotrichum graminicola infection verified by OJIP study

Anthracnose caused by Colletotrichum graminicola (Ces.) Wils is among the most aggressive maize diseases worldwide, considerably hindering crop productivity. To investigate the responses underlying the host–pathogen interaction involved in anthracnose infection, we conducted two field experiments in...

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Bibliographic Details
Published in:Tropical plant pathology 2021-12, Vol.46 (6), p.674-683
Main Authors: Campos, Leonardo José Motta, de Almeida, Rodrigo Estavam Munhoz, da Silva, Dagma Dionísia, Cota, Luciano Viana, Naoe, Alessandra Maria Lima, Peluzio, Joênes Mucci, Bernardes, Fernanda Pinheiro, da Costa, Rodrigo Veras
Format: Article
Language:English
Subjects:
Anthracnose
Biomedical and Life Sciences
Chlorophyll
Colletotrichum graminicola
Corn
Crop production
Field tests
Fluorescence
Grain
Hybrids
Infections
Inoculation
Life Sciences
Original Article
Photosynthesis
Photosynthetic apparatus
Photosystem II
Plant Pathology
Productivity
Stalk rot
Weight reduction
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Summary:Anthracnose caused by Colletotrichum graminicola (Ces.) Wils is among the most aggressive maize diseases worldwide, considerably hindering crop productivity. To investigate the responses underlying the host–pathogen interaction involved in anthracnose infection, we conducted two field experiments in some of the main grain producing areas of the State of Tocantins, in Brazil. Four maize hybrids (with differential tolerance to C. graminicola ) were sown in February and March, 2017. Chlorophyll fluorescence measures were performed according to the OJIP protocol; additionally, SPAD readings were conducted and productivity components were assessed. Inoculation with the fungus spore suspension affected the response curve of the chlorophyll fluorescence transient, SPAD index, and productivity components. Anthracnose stalk rot caused 20–25% reduction in grain weight, 6–8% reduction in maize ear size, and 20–23% reduction in ear weight. Furthermore, plants experiencing C. graminicola rot showed reduced SPAD index and a 24–34% reduction in the activity indicator of PSII (PI Total ). These changes in the photosynthetic apparatus were successfully observed via chlorophyll fluorescence measurements.
ISSN:1983-2052
1982-5676
1983-2052
DOI:10.1007/s40858-021-00465-x