Identification of sources of resistance to anthracnose stalk rot in maize

Nicoli, Alessandro; Zambolim, Laércio; Costa, R. V. da; Guimarães, L. J. M.; Lanza, F.

doi:10.1590/0103-8478cr20151052

Cited by 8 publications

(3 citation statements)

References 16 publications

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“…For evaluation of the anthracnose stalk rot severity in maize, most studies use a scoring scale relative to the number of discolored internodes (Badu-Apraku et al 1987b, Weldekidan & Hawk 1993, Nicoli et al 2016 or the area of the internal lesion of the stalk (Pereira et al 1989). In this study, in addition to the evaluation of the number of discolored internodes (NDI), the internal length of the lesion (ILL) was used, since it is a direct and non-subjective method of determination of the anthracnose stalk rot severity.…”

Section: Resultsmentioning

confidence: 99%

Genetic control of anthracnose stalk rot resistance in tropical maize

Matiello

Máximo

Coelho

2021

Pesqui. Agropecu. Trop.

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The genetic resistance to diseases in plants represents an important support pillar in modern agriculture. This study aimed to determine the genetic inheritance to anthracnose stalk rot resistance in tropical maize. Nine segregating families were obtained from contrasting inbred lines crosses. The parental lines and the filial generations (F1, F2, BC1 and BC2) were evaluated for antrachnose stalk rot resistance in an experiment in randomized blocks, with three replications. The treatments were arranged in a split-plot design, with family effect in the plots and generation effect in the split-plots. The results showed a similar inheritance among the families, with predominance of additive genetic effects. The inbreed lines (LR 04-2, LR 03-2 and LR 23-1) were very effective in transmitting resistance genes to their descendants because they allowed sharp decreases in the lesions length in the stalks. It was also possible to notice an oligogenic inheritance involved in the anthracnose stalk rot resistance for the evaluated families. It may be inferred that genetic gains from artificial selection could be successful for developing maize inbred lines more resistant to anthracnose stalk rot.

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Section: Resultsmentioning

confidence: 99%

Genetic control of anthracnose stalk rot resistance in tropical maize

Matiello

Máximo

Coelho

2021

Pesqui. Agropecu. Trop.

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“…All the leaves and the stalk section between the first internode and the ear insertion internode were removed. Once in the laboratory, stalks were cut longitudinally, and the extent (severity) of the lesions was assessed using the scale reported by Nicoli et al (2015). This scale comprises eight severity scores, varying from 1 (6.2% of the internode is necrotic tissue) to 8 (93.8% of the internode is necrotic tissue).…”

Section: The Inoculation Processmentioning

confidence: 99%

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

Campos

Almeida

Silva

et al. 2021

Trop. plant pathol.

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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.

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“…Together with rice and wheat, maize supplies nearly half of all daily calories in human food, with maize being responsible for roughly 10% of that total ( 14 , 15 ). Although many diseases negatively impact maize production, anthracnose is one of the most important diseases, and requires the use of integrated practices to control it ( 16 – 19 ). Anthracnose disease is caused by Colletotrichum graminicola , a haploid ascomycete fungus that can infect most plant tissues, although stalk rot and seedling blight can cause the most significant economic damage ( 20 – 22 ).…”

Section: Introductionmentioning

confidence: 99%